Height-adjustable LED classroom lamp

Abstract

The utility model discloses a height -adjustable LED classroom lamp relates to LED classroom lamp technical field, including lamp, including backplate, two hangers, two ceiling covers, two supports and lamp pearl, two hangers all set up at the top of backplate, two ceiling covers respectively mobilely cover and set on two hangers, the lamp pearl is fixed in the top inner wall of backplate, and, rotating mechanism, including two rotating shafts, the rotating frame of U type and drive part, both ends of rotating frame all have the first bearing, one end of two rotating shafts respectively with two first bearing's inner ring inner wall fixed, the utility model hanger telescopic, can according to actual need flexible adjustment lamp height, adapts to different classroom environment, through the sliding of I -joist on U type board left and right, through the fixed mechanism to the position and fixes, the convenient avoidance barrier, through rotating mechanism can be convenient to the adjustment of the light direction angle, reaches the blackboard illumination requirement.

Description

Technical Field

[0001] This utility model relates to the field of LED classroom lighting technology, and in particular to an adjustable-height LED classroom light. Background Technology

[0002] LED classroom lights are lighting devices specifically designed for educational environments. Using LEDs (light-emitting diodes) as the light source, they feature energy saving, eye protection, and intelligent control, aiming to provide students and teachers with a healthy and comfortable lighting environment.

[0003] However, in practical applications, there are still some unresolved issues. Here are some common problems with height-adjustable LED classroom lights: LED classroom lights are usually fixed to the indoor ceiling. However, there are often obstacles such as beams, fans, and projectors in the room, which makes it difficult to flexibly install and adjust according to the obstacles, making it difficult to meet the classroom lighting environment requirements. Utility Model Content

[0004] The purpose of this section is to outline some aspects of embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be construed as limiting the scope of the present invention.

[0005] In view of the problems existing in the above and / or existing adjustable height LED classroom lights, this utility model is proposed.

[0006] Therefore, the problem to be solved by this utility model is how to address the issue that LED classroom lights are usually fixed on the indoor ceiling, but there are often obstacles such as beams, fans, and projectors in the room, making it inconvenient to flexibly install and adjust them according to the obstacles, thus making it difficult to meet the requirements of the classroom lighting environment.

[0007] To solve the above-mentioned technical problems, this utility model provides the following technical solution: an adjustable-height LED classroom light, comprising: a lamp, including a back panel, two hanging rods, two ceiling covers, two brackets, and LED beads; the two hanging rods are both set on the top of the back panel, and the two ceiling covers are respectively movably sleeved on the two hanging rods; the LED beads are fixed to the top inner wall of the back panel; and a rotating mechanism, including two rotating shafts, a U-shaped rotating frame, and a driving component; both ends of the rotating frame are embedded with first bearings; one end of each of the two rotating shafts is fixed to the inner wall of the inner ring of the two first bearings; the ends of the two rotating shafts that are close to each other are respectively fixed to the two sides of the back panel; a cover is fixed to one side of the rotating frame; a U-shaped plate is fixed to the top of the rotating frame; a strip-shaped hole is opened on the U-shaped plate; an I-beam is slidably connected to the inner wall of the strip-shaped hole; and a fixing mechanism is provided on the I-beam.

[0008] As a preferred embodiment of the adjustable height LED classroom light of this utility model, the driving component includes a worm gear, a knob, and a worm wheel. One end of the worm gear is rotatably disposed with the inner wall of one side of the cover, and the other end passes through one side of the cover and is fixed to one end of the knob. The worm wheel is fixedly sleeved on one of the rotating shafts, and the worm gear meshes with the worm wheel.

[0009] As a preferred embodiment of the adjustable height LED classroom light of this utility model, the fixing mechanism includes a wing screw, a pressure plate, and a rubber pad. The I-beam has a receiving hole. The outer side of the pressure plate is slidably connected to the inner wall of the receiving hole. The wing screw is threadedly connected to the I-beam. The rubber pad is fixed to the bottom of the pressure plate. A second bearing is fixedly installed on the top of the pressure plate. The bottom end of the wing screw is fixed to the inner wall of the inner ring of the second bearing.

[0010] As a preferred embodiment of the adjustable height LED classroom light of this utility model, the hanging rod includes a long tube, a first tube body, a second tube body, and a fixing member. The long tube is fixed to the bottom end of the first tube body, the outer side of the second tube body is slidably connected to the inner wall of the long tube, and the fixing member is disposed on the surface of the long tube.

[0011] As a preferred embodiment of the adjustable height LED classroom light of this utility model, the fixing component includes a U-shaped frame, a rod, a spring, and a fixing ring. The frame is fixed to the surface of a long tube. Both the frame and the long tube have movable holes. The outer side of the rod is slidably connected to the inner wall of the two movable holes. The spring is movably sleeved on the surface of the rod. The fixing ring is fixedly sleeved on the rod. The two ends of the spring abut against the fixing ring and the side of the frame that are close to each other. The surface of the second tube has multiple slots. One end of the rod is inserted into the slot, and the other end of the rod is fixed with a pull ring.

[0012] As a preferred embodiment of the adjustable height LED classroom light of this utility model, the light fixture further includes an outer frame fixed to the bottom of the back panel by screws, a PC diffuser plate fixedly disposed on the inner wall of the back panel, a wide-angle grille fixedly disposed at the bottom of the PC diffuser plate, the PC diffuser plate and the wide-angle grille being located between the back panel and the outer frame, and a driving power supply fixedly disposed on the top of the back panel.

[0013] In a preferred embodiment of the adjustable-height LED classroom light of this utility model, an LED lens is fixedly mounted on the LED bead.

[0014] As a preferred embodiment of the adjustable height LED classroom light of this utility model, a movable hole is provided on one side of the long tube, and a movable block is fixedly provided on one side of the second tube body, with one end of the movable block located in the movable hole and slidably connected.

[0015] As a preferred embodiment of the adjustable-height LED classroom light of this utility model, the top of the I-beam is fixed with a hanging column, and both the hanging column and the second tube are provided with first pin holes. The first pin hole of the second tube and the first pin hole of the hanging column are provided with the same first cotter pin. The ceiling cover is movably sleeved on the first tube. Two brackets are movably sleeved on the two first tubes respectively. The first tube is provided with a second pin hole, and a second cotter pin is provided in the second pin hole. Mounting holes are provided at both ends of the brackets.

[0016] As a preferred embodiment of the adjustable height LED classroom light of this utility model, four claws are fixedly provided on the bottom inner wall of the ceiling cover, and four holes are provided on the top four sides of the first tube body, and the claws engage with the holes.

[0017] The advantages of this utility model are: the rod is telescopic, and the rod body can be moved by pulling the pull ring, so that the second tube body can slide inside the long tube. After adjusting to a suitable length, the rod body is inserted into the slot and fixed by using a spring. The height of the lamp can be flexibly adjusted according to actual needs to adapt to different classroom environments.

[0018] By rotating the wing screw to move the pressure plate upward, the position of the I-beam on the U-shaped plate can be moved. After moving it to the appropriate position, rotate the wing screw again to push the pressure plate downward, so that the rubber pad is tightly attached to the surface of the U-shaped plate. The friction force is used to fix the position of the I-beam, thereby realizing the left and right movement of the lamp position, making it easier to avoid obstacles.

[0019] When the classroom has fans or beams that affect installation, the height and arrangement of the lights can be adjusted according to the actual situation to meet the classroom's lighting requirements. When the blackboard has projectors or beams that affect installation, the blackboard light hanger can be slid left and right to adjust, and can also be adjusted by telescopic adjustment to avoid the influence of the projector arm. For short-throw projectors, the blackboard light can be moved outward, and the worm gear can be driven by rotating the knob to rotate the back panel and the light fixture, thereby adjusting the lighting angle to meet the blackboard lighting requirements. It can adapt to a variety of complex classroom installation environments. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the main structure of an adjustable-height LED classroom light.

[0022] Figure 2 This is an exploded view of the first part of the structure of an adjustable-height LED classroom light.

[0023] Figure 3 This is a schematic diagram of the upward structure of an adjustable-height LED classroom light.

[0024] Figure 4 This is a schematic diagram of the hanging rod structure for an adjustable-height LED classroom light.

[0025] Figure 5 An adjustable-height LED classroom light Figure 1 Enlarged structural diagram of section A.

[0026] Figure 6 An adjustable-height LED classroom light Figure 1 Enlarged structural diagram of section B.

[0027] Figure 7 This is a schematic diagram of the internal structure of the cover of an adjustable-height LED classroom light.

[0028] Figure 8 This is a schematic diagram of the cross-sectional structure of an I-beam for an adjustable-height LED classroom light.

[0029] Figure 9 This is a schematic diagram of the first part of an adjustable-height LED classroom light.

[0030] Figure 10 This is a schematic diagram of the second part of an adjustable-height LED classroom light.

[0031] Figure 11 This is an exploded view of the second part of the structure of an adjustable-height LED classroom light.

[0032] Figure 12 An exploded view of the I-beam structure of an adjustable-height LED classroom light.

[0033] In the diagram: 1. Light fixture; 11. Back panel; 12. Hanging rod; 121. Long tube; 122. First tube body; 123. Second tube body; 1232. Moving hole; 1231. Moving block; 124. Fixture; 125. Frame; 126. Rod body; 1261. Slot; 127. Fixing ring; 128. Spring; 13. Ceiling cover; 131. Claw; 132. Locking hole; 14. Drive power supply; 15. U-shaped plate; 16. Outer frame; 17. Wide-angle grille; 18. PC diffuser plate; 19. LED beads; 2. Rotating mechanism; 21. Rotating frame; 22. Rotating shaft; 23. Cover; 24. Worm gear; 25. Worm wheel; 26. Driving component; 3. I-beam plate; 31. First cotter pin; 32. Lifting column; 4. Fixing mechanism; 41. Wing screw; 42. Pressure plate; 43. Rubber pad; 44. Receiving hole; 5. Bracket; 51. Second cotter pin. Detailed Implementation

[0034] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0035] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0036] Secondly, the term "an embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that excludes other embodiments.

[0037] Example 1, referring to Figures 1-12 This is the first embodiment of the present utility model. This embodiment provides an adjustable height LED classroom light, including a lamp 1, a back plate 11, two hanging rods 12, two ceiling covers 13, two brackets 5, and LED beads 19. The two hanging rods 12 are both set on the top of the back plate 11, the two ceiling covers 13 are respectively movably sleeved on the two hanging rods 12, and the LED beads 19 are fixed to the top inner wall of the back plate 11.

[0038] The rotating mechanism 2 includes two rotating shafts 22, a U-shaped rotating frame 21, and a driving component 26. Both ends of the rotating frame 21 are embedded with first bearings. One end of each of the two rotating shafts 22 is fixed to the inner wall of the inner ring of the two first bearings. The ends of the two rotating shafts 22 that are close to each other are fixed to the two sides of the back plate 11. A cover 23 is fixed to one side of the rotating frame 21. A U-shaped plate 15 is fixed to the top of the rotating frame 21. A strip hole is opened on the U-shaped plate 15. An I-beam plate 3 is slidably connected to the inner wall of the strip hole. A fixing mechanism 4 is provided on the I-beam plate 3.

[0039] The hanging rod 12 is telescopic, which can flexibly adjust the height of the lamp 1 according to actual needs to adapt to different classroom environments. It slides left and right on the U-shaped plate 15 through the I-beam plate 3 and is fixed in position by the fixing mechanism 4, which makes it easy to avoid obstacles. The direction and angle of the light can be easily adjusted by the rotating mechanism 2 to meet the blackboard lighting requirements.

[0040] Specifically, the drive component 26 includes a worm 24, a knob, and a worm wheel 25. One end of the worm 24 is rotatably connected to the inner wall of one side of the cover 23 via a bearing, and the other end passes through one side of the cover 23 and is fixed to one end of the knob. The worm wheel 25 is fixedly sleeved on one of the rotating shafts 22, and the worm 24 meshes with the worm wheel 25.

[0041] When the knob is rotated, the worm gear 24 drives the worm wheel 25 to rotate, which in turn drives the back plate 11 and the lamp 1 to rotate, thus adjusting the lighting angle.

[0042] Specifically, the fixing mechanism 4 includes a wing screw 41, a pressure plate 42, and a rubber pad 43. The I-beam plate 3 has a receiving hole 44. The outer side of the pressure plate 42 is slidably connected to the inner wall of the receiving hole 44. The wing screw 41 is threadedly connected to the I-beam plate 3. The rubber pad 43 is fixed to the bottom of the pressure plate 42. A second bearing is fixedly installed on the top of the pressure plate 42. The bottom end of the wing screw 41 is fixed to the inner wall of the inner ring of the second bearing.

[0043] Rotate the wing screw 41, which pushes the pressure plate 42 down through the second bearing, so that the rubber pad 43 is tightly attached to the surface of the U-shaped plate 15, and the position of the I-beam plate 3 is fixed by friction.

[0044] Specifically, the boom 12 includes a long pipe 121, a first pipe body 122, a second pipe body 123, and a fixing member 124. The long pipe 121 is fixed to the bottom end of the first pipe body 122, the outer side of the second pipe body 123 is slidably connected to the inner wall of the long pipe 121, and the fixing member 124 is disposed on the surface of the long pipe 121.

[0045] The second tube 123 slides within the long tube 121, allowing for adjustment of the length of the boom 12. The adjusted length can be fixed using the fixing member 124.

[0046] Specifically, the fastener 124 includes a U-shaped frame 125, a rod 126, a spring 128, and a fixing ring 127. The frame 125 is fixed to the surface of the long tube 121. Both the frame 125 and the long tube 121 have movable holes. The outer side of the rod 126 is slidably connected to the inner wall of the two movable holes. The spring 128 is movably sleeved on the surface of the rod 126. The fixing ring 127 is fixedly sleeved on the rod 126. The two ends of the spring 128 abut against the sides of the fixing ring 127 and the frame 125 that are close to each other. The surface of the second tube 123 has multiple slots 1261. One end of the rod 126 is inserted into the slot 1261, and the other end of the rod 126 is fixed with a pull ring.

[0047] Pulling the pull ring causes the rod 126 and the fixing ring 127 to move (compressing the spring 128), causing one end of the rod 126 to leave the slot 1261. Then, pull the second tube 123 by hand, and the second tube 123 slides inside the long tube 121. Adjust it to a suitable length and align the slot 1261 with the rod 126. Release the hand that pulled the pull ring. At this time, the compressed spring 128 is released, pushing one end of the rod 126 into the slot 1261 for fixation. The material and specifications of the spring 128 can be selected according to actual needs.

[0048] The LED chip 19 and the driver power supply 14 are existing technologies. The working principle of this part is also existing technology, which can be clearly understood by those skilled in the art, and will not be described in detail here.

[0049] Example 2, refer to Figures 1-12 This is the second embodiment of the present invention, which is based on the previous embodiment.

[0050] Specifically, the lamp 1 also includes an outer frame 16 fixed to the bottom of the back plate 11 by screws, a PC diffuser plate 18 fixedly disposed on the inner wall of the back plate 11, a wide-angle grille 17 fixedly disposed at the bottom of the PC diffuser plate 18, the PC diffuser plate 18 and the wide-angle grille 17 are both located between the back plate 11 and the outer frame 16, and a driving power supply 14 fixedly disposed on the top of the back plate 11.

[0051] In the second stage of light emission from lamp 1, the light passes through PC diffuser plate 18. The optical performance of the diffuser plate is to fully scatter and diffuse the light, making the light emission more uniform and soft, thus performing secondary anti-glare. In the third stage of light emission from lamp 1, after the light has been fully scattered and diffused, it passes through wide-angle grille 17 (the grille adopts ABS aluminum plating process, which has good anti-glare effect and is resistant to yellowing) to cut off and control the light. The light is blocked by the electroplated grille to form a protective angle, achieving excellent anti-glare effect. The driving power supply 14, i.e., the LED driving power supply (adopting bipolar flicker-free), is used to connect the power supply of lamp beads 19.

[0052] Specifically, an LED lens is fixedly installed on the LED bead 19.

[0053] The LED bead 19 is designed with an LED lens. The light emitted by the LED bead 19 is diffused through the LED lens, so that the light emitted by the entire lamp 1 starts to diffuse evenly in the first stage, thus achieving first-level anti-glare.

[0054] Specifically, a movable hole 1232 is provided on one side of the long tube 121, and a movable block 1231 is fixedly provided on one side of the second tube 123. One end of the movable block 1231 is located in the movable hole 1232 and is slidably connected.

[0055] The movement of the second tube 123 can be limited by the moving hole 1232 and the moving block 1231 to prevent rotation.

[0056] Specifically, a lifting column 32 is fixed to the top of the I-beam 3. The lifting column 32 and the second tube 123 are both provided with first pin holes. The same first cotter pin 31 is inserted into the first pin hole of the second tube 123 and the first pin hole of the lifting column 32. The ceiling cover 13 is movably sleeved on the first tube 122. The two brackets 5 are movably sleeved on the two first tubes 122 respectively. The first tube 122 is provided with second pin holes. The second cotter pin 51 is inserted into the second pin holes. The two ends of the brackets 5 are respectively provided with mounting holes.

[0057] The second cotter pin 51 facilitates the connection between the first tube 122 and the bracket 5, and the first cotter pin 31 facilitates the connection between the boom 12 and the lifting column 32.

[0058] Specifically, four claws 131 are fixedly installed on the bottom inner wall of the ceiling cover 13, and four holes 132 are opened on the top four sides of the first tube body 122, and the claws 131 engage with the holes 132.

[0059] Pull the ceiling cover 13 upwards, and the ceiling cover 13 slides on the first tube body 122. When the claw 131 of the ceiling cover 13 moves to the position of the locking hole 132, the claw 131 locks into the locking hole 132, and the ceiling cover 13 is fixed.

[0060] When in use, adjust the length of the rod 12 (i.e., adjust the height of the back plate 11) according to actual needs. The specific steps are as follows: pull the pull ring. The movement of the pull ring drives the rod 126 and the fixing ring 127 to move (the spring 128 is compressed), so that one end of the rod 126 leaves the slot 1261. Then, pull the second tube 123 by hand. The second tube 123 slides in the long tube 121. Adjust it to a suitable length and align the slot 1261 with the rod 126. Release the hand that pulled the pull ring. At this time, the compressed spring 128 is released, pushing one end of the rod 126 into the slot 1261 for fixation.

[0061] After adjusting the lengths of the two booms 12, move the booms 12 to the position of the lifting column 32 and insert the lifting column 32 into the second tube 123. During the insertion process, the first pin hole of the second tube 123 and the first pin hole of the lifting column 32 need to be aligned. Then, take the first cotter pin 31 and insert it into the first pin hole of the second tube 123 and the first pin hole of the lifting column 32. Then, bend both ends of the first cotter pin 31 to complete the connection between the booms 12 and the lifting column 32.

[0062] When it is necessary to move the position of the boom 12 left or right, rotate the wing screw 41. The rotation of the wing screw 41 causes the pressure plate 42 to move upward. Then, move the I-beam 3 by hand. The I-beam 3 moves on the U-shaped plate 15. When it is moved to the appropriate position, rotate the wing screw 41. The pressure plate 42 is pushed down through the second bearing, so that the rubber pad 43 is pressed tightly against the surface of the U-shaped plate 15. The position of the I-beam 3 is fixed by friction.

[0063] Based on the positions of the two hanging rods 12, the two brackets 5 are fixed to the ceiling of the classroom using bolts and mounting holes. Then, the ceiling cover 13 is fitted onto the first tube 122, and the top of the first tube 122 is inserted into the bracket 5. The second cotter pin 51 is taken out and inserted into the second pin hole of the first tube 122. The two ends of the second cotter pin 51 are bent to fix the first tube 122 onto the bracket 5. Then, the ceiling cover 13 is pulled upwards and slides on the first tube 122. When the claw 131 of the ceiling cover 13 moves to the position of the locking hole 132, the claw 131 is locked into the locking hole 132, fixing the ceiling cover 13 and completing the overall installation.

[0064] The LED bead 19 is designed with an LED lens. The light emitted from the LED bead 19 is diffused by the LED lens, making the light emitted by the entire lamp 1 diffuse evenly in the first stage, achieving the first level of anti-glare. In the second stage, the light emitted by the lamp 1 passes through the PC diffuser plate 18. The optical performance of the diffuser plate is to fully scatter and diffuse the light, making the light more uniform and softer, achieving the second level of anti-glare. In the third stage, after the light is fully scattered and diffused, it passes through the wide-angle grille 17 (the grille uses ABS aluminum plating process, which has good anti-glare effect and is resistant to yellowing) to cut off and control the light. The light is blocked by the electroplated grille to form a protective angle, achieving excellent anti-glare effect. In addition, the lamp 1 uses a rectangular grille design in the C90-C270 degree direction, and the beam angle of the entire lamp reaches 110 degrees, making the light illumination of the classroom more uniform. The LED bead 19 uses a low blue light, high CRI 2835 LED bead.

[0065] When the installation of classroom lights is affected by fans and beams, the height and arrangement of the lights can be adjusted according to the actual situation, and the classroom lighting environment requirements can still be met.

[0066] When the installation of the blackboard is affected by a projector or beam, the blackboard light hanger 12 can be adjusted by sliding left and right. The hanger 12 can also be adjusted by telescopic adjustment to avoid the influence of the projector arm. If it is a short-throw projector, the blackboard light can be moved outward. By adjusting the light angle of the blackboard light, the blackboard lighting requirements can be met. The adjustment steps are as follows: when rotating the knob, the worm gear 24 drives the worm wheel 25 to rotate, which drives the back plate 11 to rotate, thereby adjusting the lighting angle.

[0067] It should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. An adjustable-height LED classroom light, characterized in that: include, The lighting fixture (1) includes a back panel (11), two hanging rods (12), two ceiling covers (13), two brackets (5), and LED beads (19). The two hanging rods (12) are both located on the top of the back panel (11), and the two ceiling covers (13) are respectively movably mounted on the two hanging rods (12). The LED beads (19) are fixed to the inner top wall of the back panel (11). The rotating mechanism (2) includes two rotating shafts (22), a U-shaped rotating frame (21), and a driving component (26). Both ends of the rotating frame (21) are embedded with first bearings. One end of each of the two rotating shafts (22) is fixed to the inner wall of the inner ring of the two first bearings. The ends of the two rotating shafts (22) that are close to each other are fixed to the two sides of the back plate (11). A cover (23) is fixed to one side of the rotating frame (21). A U-shaped plate (15) is fixed to the top of the rotating frame (21). A strip hole is opened on the U-shaped plate (15). An I-beam plate (3) is slidably connected to the inner wall of the strip hole. A fixing mechanism (4) is provided on the I-beam plate (3).

2. The adjustable-height LED classroom light as described in claim 1, characterized in that: The drive component (26) includes a worm (24), a knob, and a worm wheel (25). One end of the worm (24) is rotatably mounted on the inner wall of one side of the cover (23), and the other end passes through one side of the cover (23) and is fixed to one end of the knob. The worm wheel (25) is fixedly mounted on one of the rotating shafts (22), and the worm (24) meshes with the worm wheel (25).

3. The height-adjustable LED classroom light as described in claim 2, characterized in that: The fixing mechanism (4) includes a wing screw (41), a pressure plate (42), and a rubber pad (43). The I-beam (3) has a receiving hole (44). The outer side of the pressure plate (42) is slidably connected to the inner wall of the receiving hole (44). The wing screw (41) is threadedly connected to the I-beam (3). The rubber pad (43) is fixed to the bottom of the pressure plate (42). A second bearing is fixedly installed on the top of the pressure plate (42). The bottom end of the wing screw (41) is fixed to the inner wall of the inner ring of the second bearing.

4. The adjustable-height LED classroom light as described in claim 3, characterized in that: The boom (12) includes a long tube (121), a first tube body (122), a second tube body (123), and a fixing member (124). The long tube (121) is fixed to the bottom end of the first tube body (122). The outer side of the second tube body (123) is slidably connected to the inner wall of the long tube (121). The fixing member (124) is disposed on the surface of the long tube (121).

5. The adjustable-height LED classroom light as described in claim 4, characterized in that: The fastener (124) includes a U-shaped frame (125), a rod (126), a spring (128), and a fixing ring (127). The frame (125) is fixed to the surface of the long tube (121). Both the frame (125) and the long tube (121) have movable holes. The outer side of the rod (126) is slidably connected to the inner wall of the two movable holes. The spring (128) is movably sleeved on the surface of the rod (126). The fixing ring (127) is fixedly sleeved on the rod (126). The two ends of the spring (128) abut against the fixing ring (127) and the side of the frame (125) that are close to each other. The surface of the second tube (123) has multiple slots (1261). One end of the rod (126) is inserted into the slot (1261), and the other end of the rod (126) is fixed with a pull ring.

6. The adjustable-height LED classroom light as described in claim 1, characterized in that: The lamp (1) also includes an outer frame (16) fixed to the bottom of the back plate (11) by screws. A PC diffuser plate (18) is fixedly provided on the inner wall of the back plate (11). A wide-angle grille (17) is fixedly provided at the bottom of the PC diffuser plate (18). The PC diffuser plate (18) and the wide-angle grille (17) are both located between the back plate (11) and the outer frame (16). A driving power supply (14) is fixedly provided on the top of the back plate (11).

7. The height-adjustable LED classroom light as described in claim 1, characterized in that: An LED lens is fixedly installed on the lamp bead (19).

8. The height-adjustable LED classroom light as described in claim 4, characterized in that: A movable hole (1232) is provided on one side of the long tube (121), and a movable block (1231) is fixedly provided on one side of the second tube body (123). One end of the movable block (1231) is located in the movable hole (1232) and is slidably connected.

9. The height-adjustable LED classroom light as described in claim 1, characterized in that: The top of the I-beam (3) is fixed with a hoisting column (32). The hoisting column (32) and the second tube (123) are both provided with a first pin hole. The first pin hole of the second tube (123) and the first pin hole of the hoisting column (32) are provided with the same first cotter pin (31). The ceiling cover (13) is movably sleeved on the first tube (122). The two brackets (5) are movably sleeved on the two first tubes (122). The first tube (122) is provided with a second pin hole. The second cotter pin (51) is provided in the second pin hole. The two ends of the bracket (5) are respectively provided with mounting holes.

10. The height-adjustable LED classroom light as described in claim 9, characterized in that: The bottom inner wall of the ceiling cover (13) is fixedly provided with four claws (131), and the top four sides of the first tube body (122) are provided with locking holes (132), and the claws (131) engage with the locking holes (132).

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