Reflector plate post-processing device for LED backlight source

Abstract

The invention relates to the technical field of reflector plate processing, in particular to an LED backlight reflector plate post-processing processing device which comprises a circular cutting machine and a circular cutting die, a pair of top grooves are formed in the top end of the circular cutting machine, circular blocks are rotationally connected to the inner sides of the top grooves, and rectangular grooves are formed in the top ends of the circular blocks; according to the circular cutting machine, through the arrangement of the positioning block, the extrusion plate, the material taking mechanism and other structures, the circular cutting die can be automatically placed in the circular cutting machine, the rectangular blocks at the two ends of the circular cutting die are locked in the rectangular grooves, the circular cutting die can be automatically placed in the circular cutting machine, and therefore the circular cutting die can be automatically placed in the circular cutting machine; and meanwhile, when the circular cutting die needs to be replaced, limitation on the circular cutting die can be automatically relieved, then the circular cutting die is taken out through cooperation of a double-end electric telescopic cylinder, an upper electric telescopic cylinder and a driving motor, and then the replaced circular cutting die is placed on the circular cutting die. Therefore, automatic replacement of the circular cutting die is realized.

Description

Technical Field

[0001] The present invention relates to the technical field of reflector processing, and particularly to a post-processing device for an LED backlight reflector. Background Art

[0002] The reflector is mainly a shielding material to prevent the leakage of the fluorescent light source of the cold cathode tube, that is, to prevent the light of the CCFL from leaking out and reflect the light source so that it can be projected forward intensively. The post-processing device for an LED backlight reflector is a device specifically used for processing reflectors, aiming to improve production efficiency, reduce material damage and defect rate. The device realizes the efficient processing and waste removal of reflectors through the coordinated action of various functional components.

[0003] In the prior art, a circular knife die with a blade adjustment indication, with the publication number of CN220661168U, is provided with a pressure sensor, which is convenient for intuitively detecting the pressure of the circular knife die and the auxiliary feeding roller on the material when adjusting the screw during the passing state of the material, and then judging whether the adjusted position of the circular knife die is appropriate. Moreover, the acting condition of the circular knife die and the auxiliary feeding roller on the material is quantified and displayed through the pressure sensor, so as to objectively reflect whether the position of the circular knife die is reasonable.

[0004] Although the above circular knife machine can adjust the spacing according to the die, there are still some defects in the actual processing. With the rapid development of LED technology, the styles and functions of LED lamps are becoming increasingly diverse, and the demand for LED backlight reflectors has also become more complex and diverse. Different styles of LED lamps require reflectors of different sizes and shapes to meet the requirements of their optical performance and structural design. Therefore, when producing reflectors, it is often necessary to replace the circular knife die of the circular knife machine according to the production requirements. The existing manual disassembly and replacement are rather time-consuming.

[0005] Therefore, a post-processing device for an LED backlight reflector is proposed to solve the above problems. Summary of the Invention

[0006] The purpose of the present invention is to provide a post-processing device for an LED backlight reflector to solve the problems raised in the above background art.

[0007] To achieve the above object, the technical solution adopted by the present invention is as follows: A post-treatment processing device for a reflective sheet of an LED backlight source, including a circular cutting machine and a circular knife die. A pair of top grooves are opened at the top end of the circular cutting machine. Circular blocks are rotatably connected to the inner sides of the top grooves. A rectangular groove is opened at the top end of the circular block. Rectangular blocks for inserting into the rectangular grooves are fixedly connected to both the front and rear ends of the circular knife die. A workbench is provided at the rear side of the circular cutting machine. A pair of placement seats for placing the circular knife die are fixedly connected to the workbench. A support frame is fixedly connected between the top end of the workbench and the top end of the circular cutting machine. Side plates are fixedly connected to both ends of the inner side of the rectangular groove. Positioning blocks are horizontally slidably connected between the side plates and the inner side of the rectangular groove. A U-shaped pressing plate is longitudinally slidably connected to the inner side of the rectangular groove. Right-angled blocks with inclined surfaces are fixedly connected to both sides of the bottom of the pressing plate. Positioning grooves are opened on both sides of the outer wall of the rectangular block. A material taking mechanism for releasing the positioning and taking out the circular knife die is provided on the support frame. A limiting mechanism for restricting the position of the pressing plate is provided in the rectangular groove.

[0008] In the above technical solution, further, the relatively far sides of the positioning blocks are set as smooth arc surfaces. A pair of positioning springs are fixedly connected between the side walls of the positioning blocks and the inner side of the rectangular groove. A pair of pressing springs are fixedly connected between the bottom end of the pressing plate and the bottom end of the rectangular groove. The relatively far bottom ends of the positioning blocks are inclined. The bottom ends of the positioning grooves are inclined.

[0009] In the above technical solution, further, the material taking mechanism includes a top plate. The top plate is arranged below the support frame. A through groove is opened on the support frame. A material taking block is slidably connected to the inner side of the through groove. An upper electric telescopic cylinder is fixedly connected to the top end of the material taking block. The output end of the upper electric telescopic cylinder passes through the bottom end of the material taking block and is fixedly connected to the top end of the top plate. Lower electric telescopic cylinders are fixedly connected to the top end of the top plate at positions above the pressing plate. The output ends of the lower electric telescopic cylinders penetrate through the top end of the top plate. A pair of clamping plates are slidably connected to the bottom end of the top plate. A pair of sliding grooves are opened on the top end of the top plate. L-shaped sliding plates are fixedly connected to the top ends of the clamping plates at positions inside the sliding grooves. A bidirectional electric telescopic cylinder is fixedly connected to the top end of the top plate. The output ends of the bidirectional electric telescopic cylinder are fixedly connected to the side walls of the sliding plates. Insertion blocks for inserting into the positioning grooves are fixedly connected to the relatively close sides of the clamping plates.

[0010] In the above technical solution, further, a pair of upper plates are fixedly connected to the top end of the support frame. A screw rod is rotatably connected between the upper plates. The screw rod is threadedly connected to the inner side wall of the material taking block. A driving motor is fixedly connected to the side wall of one of the upper plates. The output end of the driving motor passes through the upper plate and is fixedly connected to the side wall of the screw rod.

[0011] In the above technical solution, further, one of the side walls of the circular block is fixedly connected to a driven sprocket, a driving sprocket is rotatably connected to the inside of the control cabinet of the circular cutting machine, a chain is transmission-connected between the driving sprocket and the driven sprocket, a rotating motor is fixedly connected to the bottom end of the control cabinet of the circular cutting machine, and the output end of the rotating motor is fixedly connected to the side wall of the driving sprocket.

[0012] In the above technical solution, further, an upper sensor is fixedly connected to the top of the outer wall of the driven sprocket, and a lower sensor is fixedly connected to the outer wall of the circular cutting machine relative to the upper position of the upper sensor, and the upper sensor and the lower sensor are electrically connected to the rotating motor through the controller.

[0013] In the above technical scheme, further, the limit mechanism includes a limit block, a bottom groove is opened at the bottom end of the rectangular groove, an L-shaped bottom plate is slidably connected to the inner side of the bottom groove, a plurality of card slots are opened equidistantly on the inner side of the bottom plate, and the bottom ends of the card slots are all inclined, the bottom end of the extrusion plate is fixedly connected to the lower plate, the side wall of the lower plate is penetrated by a round rod slidably connected, the limit block is fixedly connected to the side wall of the round rod, a limit spring is fixedly connected between the side wall of the limit block and the side wall of the lower plate, a pair of return springs are fixedly connected between the inner side of the bottom groove and the side wall of the bottom plate, a release rod is fixedly connected to the top of the bottom plate, the top of the release rod is set to a smooth arc surface, and the bottom end of the limit block is set to an inclined surface that fits the bottom of the card slot.

[0014] In the above technical solution, further, both sides of the bottom end of the top plate are fixedly connected with release electric telescopic cylinders, the output ends of the release electric telescopic cylinders are fixedly connected with L-shaped release plates, and the side walls of the release plates are inclined.

[0015] Compared with the prior art, the beneficial effects of the present invention are: 1. The present invention can automatically place the circular knife die into the circular cutting machine through the arrangement of the positioning block, the extrusion plate and the material taking mechanism, and then control the lower electric telescopic cylinder to start pushing the extrusion plate to lock the rectangular blocks at both ends of the circular knife die in the rectangular groove, thereby realizing the locking and fixation of the circular knife die, and then realizing the automatic installation of the circular knife die, greatly improving the convenience performance of the device.

[0016] 2. The present invention, through the arrangement of structures such as a limit mechanism and a release electric telescopic cylinder, can control the release electric telescopic cylinder to start and drive the positioning block to slide out of the positioning groove when the circular knife die needs to be replaced, thereby automatically releasing the restriction on the circular knife die. Subsequently, the circular knife die can be taken out through the cooperation of the double-head electric telescopic cylinder, the upper electric telescopic cylinder and the drive motor, and the replaced circular knife die can be placed in the installation, thereby realizing automatic replacement of the circular knife die without the need for workers to disassemble and assemble, thereby further improving the convenience of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1Front three-dimensional structural schematic diagram of the reflector processing device of the present invention; Figure 2 Attachment of the present invention Figure 1 Partial enlarged structural schematic diagram at position A in Figure 3 Rear three-dimensional structural schematic diagram of the reflector processing device of the present invention; Figure 4 Front three-dimensional structural schematic diagram when the control cabinet of the circular cutting machine of the present invention is opened; Figure 5 Overall external structural schematic diagram of the circular knife die, rotating motor and chain of the present invention; Figure 6 Full-section three-dimensional structural schematic diagram of the front of the circular block of the present invention; Figure 7 Separation three-dimensional structural schematic diagram of the circular block and the extrusion plate of the present invention; Figure 8 Overall external structural schematic diagram of the circular knife die of the present invention; Figure 9 Overall external structural schematic diagram of the top plate of the present invention.

[0018] In the figure: 1. Circular cutting machine; 2. Circular knife die; 3. Top groove; 4. Circular block; 5. Rectangular groove; 6. Rectangular block; 7. Workbench; 8. Placing seat; 9. Support frame; 10. Side plate; 11. Positioning block; 12. Extrusion plate; 13. Right-angle block; 14. Positioning groove; 15. Positioning spring; 16. Extrusion spring; 17. Top plate; 18. Material-taking block; 19. Upper electric telescopic cylinder; 20. Lower electric telescopic cylinder; 21. Clamping plate; 22. Slide plate; 23. Bidirectional electric telescopic cylinder; 24. Insert block; 25. Upper plate; 26. Screw; 27. Driving motor; 28. Driven sprocket; 29. Driving sprocket; 30. Chain; 31. Rotating motor; 32. Limit block; 33. Upper sensor; 34. Lower sensor; 35. Reset spring; 36. Bottom plate; 37. Card slot; 38. Lower plate; 39. Round rod; 40. Limit spring; 41. Release rod; 42. Release electric telescopic cylinder; 43. Release plate. Detailed implementation manners

[0019] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0020] Please refer to as Figures 1 - 9A post-processing and machining device for a reflective sheet used in an LED backlight includes a circular cutting machine 1 and a circular knife die 2. The working principle of the circular cutting machine 1 for the reflective sheet is that through the cooperation of the circular knife die 2 and the pad roller, when the circular knife die 2 rotates, pressure is applied to the material to achieve continuous rotary die-cutting. It can efficiently complete the lamination and machining of multiple layers of materials, and is equipped with an adsorption system to suck out the waste materials cut and blanked, realizing the automatic processing of the reflective sheet. A pair of top grooves 3 are opened at the top of the circular cutting machine 1. Circular blocks 4 are rotatably connected to the inner sides of the top grooves 3. Rectangular grooves 5 are opened at the tops of the circular blocks 4. Rectangular blocks 6 for inserting into the rectangular grooves 5 are fixedly connected to the front and rear ends of the circular knife die 2. A workbench 7 is provided at the rear of the circular cutting machine 1. A pair of placement seats 8 for placing the circular knife die 2 are fixedly connected to the workbench 7. A support frame 9 is fixedly connected between the top of the workbench 7 and the top of the circular cutting machine 1. Side plates 10 are fixedly connected to both ends of the inner side of the rectangular groove 5. Positioning blocks 11 are horizontally slidably connected between the side plates 10 and the inner side of the rectangular groove 5. A U-shaped pressing plate 12 is longitudinally slidably connected to the inner side of the rectangular groove 5. Right-angle blocks 13 with inclined surfaces are fixedly connected to both sides of the bottom of the pressing plate 12. Positioning grooves 14 are opened on both sides of the outer wall of the rectangular block 6. A material taking mechanism for releasing the positioning and taking out the circular knife die 2 is provided on the support frame 9. A limiting mechanism for restricting the position of the pressing plate 12 is provided in the rectangular groove 5; The sides of the positioning blocks 11 away from each other are set as smooth arc surfaces, which is convenient for the inclined surfaces of the right-angle blocks 13 to squeeze more smoothly, pushing the positioning blocks 11 to slide towards the middle. A pair of positioning springs 15 are fixedly connected between the side walls of the positioning blocks 11 and the inner side of the rectangular groove 5. Through the positioning springs 15, when the extrusion of the positioning blocks 11 is released, it is convenient to quickly pull the positioning blocks 11 out of the positioning grooves 14. A pair of extrusion springs 16 are fixedly connected between the bottom end of the pressing plate 12 and the bottom end of the rectangular groove 5. Through the setting of the extrusion springs 16, when the restriction on the pressing plate 12 is released, it is convenient to quickly push the pressing plate 12 back to its original position to release the extrusion on the positioning blocks 11. The bottom ends of the sides of the positioning blocks 11 away from each other are inclined, and the bottom ends of the positioning grooves 14 are inclined. Through the setting of the two inclined surfaces, as the positioning blocks 11 gradually slide towards the middle, the inclined surface of the bottom end of the positioning block 11 can squeeze the inclined surface of the positioning groove 14, causing the rectangular block 6 to slide downward, thereby further improving the locking effect on the rectangular block 6; Embodiment 1 The material taking mechanism includes a top plate 17. The top plate 17 is arranged below the support frame 9. A through groove is formed in the support frame 9. A material taking block 18 is slidably connected to the inner side of the through groove. The top end of the material taking block 18 is fixedly connected with an upper electric telescopic cylinder 19. The output end of the upper electric telescopic cylinder 19 passes through the bottom end of the material taking block 18 and is fixedly connected to the top end of the top plate 17. Lower electric telescopic cylinders 20 are fixedly connected to the top end of the top plate 17 at positions above the pressing plate 12. The output ends of the lower electric telescopic cylinders 20 penetrate through the top end of the top plate 17. A pair of clamping plates 21 are slidably connected to the bottom end of the top plate 17. A pair of sliding grooves are formed in the top end of the top plate 17. L-shaped sliding plates 22 are fixedly connected to the top ends of the clamping plates 21 at positions inside the sliding grooves. A bidirectional electric telescopic cylinder 23 is fixedly connected to the top end of the top plate 17. The output ends of the bidirectional electric telescopic cylinder 23 are fixedly connected to the side walls of the sliding plates 22. Insert blocks 24 for inserting into the positioning grooves 14 are fixedly connected to the sides of the clamping plates 21 close to each other; A pair of upper plates 25 are fixedly connected to the top end of the support frame 9. A screw rod 26 is rotatably connected between the upper plates 25. The screw rod 26 passes through and is threadedly connected to the inner side wall of the material taking block 18. A driving motor 27 is fixedly connected to the side wall of one of the upper plates 25. The output end of the driving motor 27 passes through the upper plate 25 and is fixedly connected to the side wall of the screw rod 26; When installing the circular knife die 2, first lift and place the circular knife die 2 on the placing seat 8. Then control the upper electric telescopic cylinder 19 to start and drive the top plate 17 to move downward, move the clamping plates 21 to both sides of the circular knife die 2. Then control the bidirectional electric telescopic cylinder 23 to start and drive the sliding plates 22 to slide inside the sliding grooves, and drive the clamping plates 21 and the insert blocks 24 to move towards the middle, so that the insert blocks 24 are inserted into the positioning grooves 14. Then control the upper electric telescopic cylinder 19 to reset and drive the top plate 17 and the circular knife die 2 to move upward. Then control the driving motor 27 to start and drive the screw rod 26 to rotate, and then drive the threadedly connected material taking block 18 to move. At the same time, drive the top plate 17 and the circular knife die 2 to move through the upper electric telescopic cylinder 19. Then move the circular knife die 2 directly above the circular cutting machine 1. Then control the driving motor 27 to stop running, and control the upper electric telescopic cylinder 19 to start and drive the top plate 17 to move downward, insert the rectangular block 6 into the rectangular groove 5. Then control the lower electric telescopic cylinder 20 to start. The output end of the lower electric telescopic cylinder 20 pushes the pressing plate 12 to move downward, and at the same time drives the two right-angle blocks 13 to move downward and gradually compress the compression spring 16. Then, through the inclined surface of the right-angle block 13, the arc surface of the positioning block 11 is squeezed, so that the positioning block 11 moves towards the middle and is inserted into the positioning groove 14, and gradually compresses the positioning spring 15, thereby realizing the locking and fixing of the rectangular block 6. During this process, the position of the pressing plate 12 will be restricted by the limiting mechanism when it moves downward. Then control the bidirectional electric telescopic cylinder 23 to reset, and then control the equipment to reset to realize the automatic installation of the circular knife die 2.

[0021] Embodiment 2 In order to ensure that the circular knife die 2 can rotate and roll cut normally, a driven sprocket 28 is fixedly connected to the side wall of one of the circular blocks 4, a driving sprocket 29 is rotatably connected to the inside of the control cabinet of the circular cutter 1, a chain 30 is transmission-connected between the driving sprocket 29 and the driven sprocket 28, a rotating motor 31 is fixedly connected to the bottom end of the control cabinet of the circular cutter 1, and the output end of the rotating motor 31 is fixedly connected to the side wall of the driving sprocket 29. When the reflective sheet is roll-cut, the driving sprocket 29 is driven to rotate by controlling the rotating motor 31, and then the driven sprocket 28 is driven to rotate under the transmission of the chain 30, thereby driving the circular block 4, the rectangular block 6 and the circular knife die 2 to rotate, thereby realizing the rolling cutting of the reflective sheet.

[0022] In order to ensure that the rectangular groove 5 is directly above when the equipment is shut down, so as to facilitate the normal disassembly and assembly of the subsequent circular knife die 2, an upper sensor 33 is fixedly connected to the top of the outer wall of the driven sprocket 28, and a lower sensor 34 is fixedly connected to the outer wall of the circular cutter 1 relative to the upper position of the upper sensor 33. The upper sensor 33 and the lower sensor 34 are electrically connected to the rotating motor 31 through the controller. Through the setting of the upper sensor 33 and the lower sensor 34, the limiting effect on the rotation stop position of the circular block 4 can be activated to ensure that the rectangular groove 5 is directly above when the equipment is shut down, thereby avoiding obstruction to the normal disassembly and assembly of the subsequent circular knife die 2.

[0023] Embodiment 3 In order to be able to automatically replace the circular knife die 2, the limiting mechanism includes a limiting block 32, a bottom groove is opened at the bottom end of the rectangular groove 5, an L-shaped bottom plate 36 is slidably connected to the inner side of the bottom groove, a plurality of slots 37 are equidistantly opened on the inner side of the bottom plate 36, and the bottom ends of the slots 37 are all inclined, a lower plate 38 is fixedly connected to the bottom end of the extrusion plate 12, a round rod 39 is slidably connected to the side wall of the round rod 39 through the side wall of the lower plate 38, the limiting block 32 is fixedly connected to the side wall of the round rod 39, a limiting spring 40 is fixedly connected between the side wall of the limiting block 32 and the side wall of the lower plate 38, a pair of return springs 35 are fixedly connected between the inner side of the bottom groove and the side wall of the bottom plate 36, a release rod 41 is fixedly connected to the top of the bottom plate 36, the top end of the release rod 41 is set as a smooth arc surface, so that the inclined surface of the release plate 43 can push the top end of the release rod 41 to slide more smoothly, and the bottom end of the limiting block 32 is set as an inclined surface that fits the bottom of the slot 37; During the process of starting the installation of the circular cutter die 2 under control by the electric telescopic cylinder 20, when the lower electric telescopic cylinder 20 pushes the extrusion plate 12 downward, it will drive the lower plate 38 and the limit block 32 on the extrusion plate 12 to move downward. The inclined surface at the bottom end of the card slot 37 will squeeze the inclined surface at the bottom end of the limit block 32, causing the limit block 32 to slide (it should be noted here that the elastic force of the return spring 35 is greater than the elastic force of the limit spring 40, so the limit block 32 will not push the bottom plate 36 to move when moving downward). At the same time, it will drive the round rod 39 to move and compress the limit spring 40. Subsequently, when the limit block 32 moves out from beside one of the card slots 37, the extrusion on the limit block 32 will be released, and then under the elastic force of the limit spring 40, the limit block 32 will be pushed into the next card slot 37. Repeating this process, after the extrusion plate 12 moves in place, the limit block 32 moves into the corresponding card slot 37. At this time, through the plane at the top end of the card slot 37 and the plane at the top end of the limit block 32, the upward movement of the limit block 32 can be restricted, thereby restricting the upward movement of the extrusion plate 12 and ensuring the stability of the extrusion of the positioning block 11; Both sides of the bottom end of the top plate 17 are fixedly connected with release electric telescopic cylinders 42. The output ends of the release electric telescopic cylinders 42 are fixedly connected with L-shaped release plates 43, and the side walls of the release plates 43 are inclined; When different types of reflective sheets need to be produced according to production requirements and the circular cutter die 2 needs to be replaced, first start the drive motor 27 to drive the screw 26 to rotate, then drive the material taking block 18 connected by threads to move. At the same time, drive the top plate 17 to move through the upper electric telescopic cylinder 19. Subsequently, when the top plate 17 moves above the circular cutter die 2, control the drive motor 27 to stop running, and control the upper electric telescopic cylinder 19 to start and drive the top plate 17 to move downward. At the same time, move the clamping plate 21 to both sides of the rectangular block 6. Then control the bidirectional electric telescopic cylinder 23 to start and drive the slide plate 22 to move towards the middle at the same time, thereby driving the clamping plate 21 and the insertion block 24 to move towards the middle, so that the insertion block 24 is inserted into the positioning groove 14. Subsequently, control the release electric telescopic cylinder 42 to start and drive the release plate 43 to move downward, and then squeeze the top end of the release rod 41 to move through the inclined surface of the release plate 43; Meanwhile, it drives the bottom plate 36 to slide in the bottom groove, and makes the limit block 32 slide out of the card slot 37, thereby releasing the up-and-down sliding restriction on the limit block 32. Then, under the elastic force of the compression spring 16, it pushes the compression plate 12 and the lower plate 38 to move upward, and drives the right-angle block 13 to move upward, thereby releasing the extrusion on the positioning block 11. Then, under the elastic force of the positioning spring 15, it pulls the positioning block 11 to slide out of the positioning groove 14, thereby releasing the limit on the rectangular block 6. Subsequently, control the upper electric telescopic cylinder 19 to retract, drive the top plate 17 and the circular knife die 2 to move upward. Then, control the driving motor 27 to reverse and drive the circular knife die 2 to move above the workbench 7, and then control the upper electric telescopic cylinder 19 to start and place the circular knife die 2 on the placing seat 8. Finally, use the overhead crane to lift away the circular knife die 2, and hang the replaced circular knife die 2 on the placing seat 8. Repeat the above operations in reverse to install the circular knife die 2.

[0024] The above shows and describes the basic principles, main features and advantages of the present invention.

[0025] Those skilled in the art of this industry should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification is only the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed.

Claims

1. A post-processing device for a reflective sheet of an LED backlight source, comprising a circular cutting machine (1) and a circular knife die (2), characterized in that: A pair of top grooves (3) are formed at the top of the circular cutting machine (1). Circular blocks (4) are rotatably connected to the inner sides of the top grooves (3). A rectangular groove (5) is formed at the top of the circular block (4). Rectangular blocks (6) for inserting into the rectangular groove (5) are fixedly connected to the front and rear ends of the circular knife die (2). A workbench (7) is arranged at the rear side of the circular cutting machine (1). A pair of placing seats (8) for placing the circular knife die (2) are fixedly connected to the workbench (7). A support frame (9) is fixedly connected between the top end of the workbench (7) and the top end of the circular cutting machine (1). Side plates (10) are fixedly connected to both ends of the inner side of the rectangular groove (5). Positioning blocks (11) are horizontally slidably connected between the side plates (10) and the inner side of the rectangular groove (5). A U-shaped pressing plate (12) is longitudinally slidably connected to the inner side of the rectangular groove (5). Right-angle blocks (13) with inclined surfaces are fixedly connected to both sides of the bottom of the pressing plate (12). Positioning grooves (14) are formed on both sides of the outer wall of the rectangular block (6). A material taking mechanism for releasing the positioning and taking out the circular knife die (2) is arranged on the support frame (9). A limiting mechanism for limiting the position of the pressing plate (12) is arranged in the rectangular groove (5).

2. The post-treatment processing device for a reflective sheet used in an LED backlight source according to claim 1, wherein: The mutually remote sides of the positioning blocks (11) are arranged as smooth arc surfaces. A pair of positioning springs (15) are fixedly connected between the side walls of the positioning blocks (11) and the inner side of the rectangular groove (5). A pair of pressing springs (16) are fixedly connected between the bottom end of the pressing plate (12) and the bottom end of the rectangular groove (5). The mutually remote bottom ends of the positioning blocks (11) are inclined. The bottom ends of the positioning grooves (14) are inclined.

3. The post-treatment processing device for a reflective sheet used in an LED backlight source according to claim 1, wherein: The material taking mechanism comprises a top plate (17). The top plate (17) is arranged below the support frame (9). A through groove is formed in the support frame (9). A material taking block (18) is slidably connected to the inner side of the through groove. An upper electric telescopic cylinder (19) is fixedly connected to the top end of the material taking block (18). The output end of the upper electric telescopic cylinder (19) passes through the bottom end of the material taking block (18) and is fixedly connected to the top end of the top plate (17). Lower electric telescopic cylinders (20) are fixedly connected to the top of the top plate (17) at positions above the pressing plate (12). The output ends of the lower electric telescopic cylinders (20) penetrate through the top end of the top plate (17). A pair of clamping plates (21) are slidably connected to the bottom end of the top plate (17). A pair of sliding grooves are formed in the top end of the top plate (17). L-shaped sliding plates (22) are fixedly connected to the top ends of the clamping plates (21) at positions corresponding to the sliding grooves. A bidirectional electric telescopic cylinder (23) is fixedly connected to the top end of the top plate (17). The output ends of the bidirectional electric telescopic cylinder (23) are fixedly connected to the side walls of the sliding plates (22). Insertion blocks (24) for inserting into the positioning grooves (14) are fixedly connected to the mutually close sides of the clamping plates (21).

4. The post-processing and machining device for a reflective sheet used in an LED backlight source according to claim 3, wherein: A pair of upper plates (25) are fixedly connected to the top end of the support frame (9). A screw rod (26) is rotatably connected between the upper plates (25). The screw rod (26) is threadedly connected through the inner side wall of the material taking block (18). A driving motor (27) is fixedly connected to the side wall of one of the upper plates (25). The output end of the driving motor (27) passes through the upper plate (25) and is fixedly connected to the side wall of the screw rod (26).

5. The post-processing and machining device for a reflective sheet used in an LED backlight source according to claim 1, wherein: A driven sprocket (28) is fixedly connected to the side wall of one of the round blocks (4). A driving sprocket (29) is rotatably connected inside the control cabinet of the circular cutting machine (1). A chain (30) is drivingly connected between the driving sprocket (29) and the driven sprocket (28). A rotating motor (31) is fixedly connected to the bottom end inside the control cabinet of the circular cutting machine (1). The output end of the rotating motor (31) is fixedly connected to the side wall of the driving sprocket (29).

6. The post-processing device for a reflective sheet used in an LED backlight source according to claim 5, characterized in that: An upper sensor (33) is fixedly connected to the top end of the outer wall of the driven sprocket (28). A lower sensor (34) is fixedly connected to the outer wall of the circular cutting machine (1) at a position above the upper sensor (33). The upper sensor (33) and the lower sensor (34) are electrically connected to the rotating motor (31) through a controller.

7. An after-treatment processing device for a reflective sheet used in an LED backlight source, characterized in that: The limiting mechanism includes a limiting block (32). A bottom groove is opened at the bottom end of the rectangular groove (5). An L-shaped bottom plate (36) is slidably connected inside the bottom groove. A plurality of clamping grooves (37) are equidistantly opened inside the bottom plate (36), and the bottom ends of the clamping grooves (37) are all inclined. A lower plate (38) is fixedly connected to the bottom end of the pressing plate (12). A round rod (39) is slidably connected through the side wall of the lower plate (38). The limiting block (32) is fixedly connected to the side wall of the round rod (39). A limiting spring (40) is fixedly connected between the side wall of the limiting block (32) and the side wall of the lower plate (38). A pair of reset springs (35) are fixedly connected between the inside of the bottom groove and the side wall of the bottom plate (36). A release rod (41) is fixedly connected to the top end of the bottom plate (36). The top end of the release rod (41) is provided with a smooth arc surface. The bottom end of the limiting block (32) is provided with an inclined surface that fits the bottom of the clamping groove (37).

8. The post-processing device for a reflective sheet used in an LED backlight according to claim 3, characterized in that: Release electric telescopic cylinders (42) are fixedly connected to both sides of the bottom end of the top plate (17). The output ends of the release electric telescopic cylinders (42) are fixedly connected with L-shaped release plates (43), and the side walls of the release plates (43) are inclined.

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