Positioning device for LED substrate surface mounting

Abstract

The invention relates to the technical field of LED substrate production, in particular to a positioning device for LED substrate surface mounting, which comprises a base, a workbench, a guide plate, a positioning plate, a fixed seat, a sliding column and the like, a workbench is connected to the base, a guide plate is connected to the middle of the workbench, a guide groove is formed in the guide plate, a positioning plate is slidably connected to the guide plate through the guide groove, a positioning assembly is connected to the guide plate, two fixing seats are connected to the front side of the base, and sliding columns are slidably connected to the sides, close to each other, of the fixing seats. The fixing ring, the rotating ring, the jacking column, the fixing ring, the inserting column, the wedge-shaped block, the connecting plate and the first spring are arranged, the situation that the wedge-shaped block extrudes and damages the base plate due to excessive rotation of the jacking column can be avoided, the contact angle and pressure between the wedge-shaped block and the side wall of the base plate are automatically adjusted, and it is ensured that the base plates of different shapes can be firmly clamped; deviation or uneven tin brushing caused by the irregular shape of the substrate is avoided, and the method can be suitable for positioning of the special-shaped substrate.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of LED substrate production, and particularly relates to a positioning device for LED substrate patching. BACKGROUND

[0002] The patching process of the LED substrate is one of the key steps in manufacturing LED lamps or display screens. First, a layer of solder paste is applied to the substrate through steel mesh printing technology, which is used to fix and electrically connect LED chips. High-precision patching machines are used to place LED chips and other surface-mounted components on the solder paste according to the designed positions. The entire process requires high precision to ensure that each component is correctly aligned and firmly adhered. After patching, the PCB will pass through a reflow soldering furnace, where the solder in the solder paste is heated to the melting temperature, and after cooling, a firm electrical connection is formed. Finally, quality inspection is carried out, including checking the quality of the solder joints, electrical performance testing, etc., to ensure the reliability and stability of the finished LED lamps.

[0003] When using a small tin brushing machine for manual tin brushing, a simple positioning plate or clamp needs to be designed according to different sizes of the substrate to achieve the fixation of the substrate and the control of the tin brushing position. However, each time a different substrate size is used, the clamp needs to be re-made or adjusted, which not only increases the production preparation time but also reduces the applicability and flexibility of the equipment. When placing the substrate, the operator needs to manually align and position it, and any slight deviation will affect the tin brushing effect, leading to uneven solder joints or missed brushing, which affects the product quality and consistency. SUMMARY

[0004] In order to overcome the shortcomings of the prior art, the purpose of the present application is to provide a positioning device for LED substrate patching.

[0005] The utility model provides a kind of positioning device for LED substrate patch, including base, workbench, guide plate, positioning plate, fixed seat, slide column, connecting rod, steel net, pull rod, rotating assembly, fixed ring, rotating ring, top column, fixed ring, plug post and positioning assembly, base is connected with workbench, the middle part of workbench is connected with guide plate, guide plate is opened with guide groove, positioning plate is slidably connected with guide groove on guide plate, positioning assembly is connected on guide plate, two fixed seats are connected on the front side of base, the side of fixed seat close to each other is slidably connected with slide column, the connecting rod that can only rotate ninety degrees is rotatably connected between two slide columns, pull rod is rotatably connected on one side fixed seat, pull rod is fixedly connected with connecting rod, steel net is detachably connected on connecting rod, two fixed rings are slidably and rotatably connected on the left and right sides of the middle part of workbench, rotating ring is rotatably connected on fixed ring, top column is connected on rotating ring, the bottom of top column is higher than the top of positioning plate, fixed ring is connected in, plug hole is spaced apart in circumferential direction on fixed ring, plug post is slidably connected with the plug hole of adaptation on the inner wall of fixed ring, rotating assembly is connected between connecting rod and fixed ring.

[0006] Further, the rotating assembly includes a fixed rod, a pressing rod, a connecting block, a rack, a gear ring, a second guide rod, and a fourth spring. The connecting rod is connected with two fixed rods at the bottom. The workbench is slidably connected with a connecting block at the left and right sides. The connecting block is connected with a pressing rod at the rear side. The pressing rod is in contact with the fixed rod at the side close to each other. The rear sides of the left and right pressing rods are inclined and vertically upwardly extended. The left and right connecting blocks are slidably connected with a second guide rod at the side away from each other. The second guide rod is fixedly connected with the workbench. The second guide rod is connected with the connecting block through a fourth spring. The left and right connecting blocks are connected with two racks at the side away from each other. The fixed ring is connected with a gear ring at the bottom. The rack is engaged with the gear ring.

[0007] Further, it further includes a connecting plate, a first spring, and a wedge-shaped block. The plug post is connected with a connecting plate. The connecting plate is slidably connected with the top column. The connecting plate is connected with a first spring between the connecting plate and the fixed ring. The top column is slidably connected with a wedge-shaped block. The connecting plate is located on the inclined surface of the wedge-shaped block.

[0008] Further, it further includes a sliding rod and a second spring. The wedge-shaped block and the top column are slidably connected with a sliding rod. The wedge-shaped block and the sliding rod are connected with a second spring.

[0009] Further, it further includes a moving seat, a bidirectional screw rod, and a motor. The fixed ring is rotatably connected with a moving seat at the bottom. The moving seat is slidably connected with the workbench. The left and right moving seats are threadedly connected with a bidirectional screw rod. The bidirectional screw rod is fixedly connected with the workbench. Two motors are installed in the workbench. The output shaft of the motor is fixedly connected with the bidirectional screw rod.

[0010] Further, the positioning assembly comprises first guide rods, clamping blocks, third springs and a handle, two slide grooves are formed in the top of the positioning plate and left and right sides, first guide rods are connected in the slide grooves, clamping blocks are slidably connected on the first guide rods, the front and rear clamping blocks are connected with each other, third springs are connected between the first guide rods and the clamping blocks, and the handle is connected to the rear side of the positioning plate.

[0011] Further, the positioning assembly further comprises extrusion strips, first inclined surfaces and second inclined surfaces, the extrusion strips are connected to the left and right sides of the guide plate, the first inclined surfaces and the second inclined surfaces are arranged on the middle portions of the extrusion strips, and the clamping blocks are slidably connected with the extrusion strips.

[0012] Further, the positioning assembly further comprises extrusion strips, first inclined surfaces and second inclined surfaces, the extrusion strips are connected to the left and right sides of the guide plate, the first inclined surfaces and the second inclined surfaces are arranged on the middle portions of the extrusion strips, and the clamping blocks are slidably connected with the extrusion strips.

[0013] The present application has the following advantages: 1. The present application is provided with a fixing ring, a rotating ring, a top column, a fixing ring, a plug-in column, a wedge-shaped block, a connecting plate and a first spring, which can avoid the excessive rotation of the top column to cause the extrusion damage of the wedge-shaped block to the base plate, automatically adjust the contact angle and pressure of the wedge-shaped block and the side wall of the base plate, ensure that the base plates of different shapes can be firmly clamped, avoid the deviation or uneven tin brushing caused by the irregular shape of the base plate, and be suitable for the positioning of special-shaped base plates.

[0014] 2. The present application is further provided with a positioning plate and a positioning assembly, which can preliminarily position the base plate, quickly and stably clamp and position the base plate through the positioning assembly, and does not need manual movement of the left and right clamping blocks and repeated adjustment of the position of the base plate, thereby ensuring the consistency of the position of the base plate during each tin brushing.

[0015] 3. The present application is further provided with a screw rod, which can adjust the height of the steel mesh by rotating the screw rod, thereby flexibly controlling the distance between the steel mesh and the guide plate, ensuring that the steel mesh can closely fit the upper surface of the base plate, achieving uniform tin brushing, being suitable for base plates of different thicknesses, and not causing the deviation of the slide column due to the downward pressure during tin brushing. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is a schematic diagram of the three-dimensional structure of the present application.

[0017] Figure 2 It is a schematic diagram of the connecting rod, steel mesh and pull rod structure of the present application.

[0018] Figure 3 It is a schematic diagram of the moving seat, bidirectional screw rod and motor structure of the present application.

[0019] Figure 4 It is a schematic diagram of the fixing ring, rotating ring and top column structure of the present application.

[0020] Figure 5 It is a schematic diagram of the jack, plug-in column and first spring structure of the present application.

[0021] Figure 6 Structure diagram of fixed rod, pressing rod and connecting block of the application.

[0022] Figure 7 Structure diagram of fixed rod, pressing rod and connecting block of the application.

[0023] Figure 8 Structure diagram of fixed rod, pressing rod and connecting block of the application.

[0024] Figure 9 Structure diagram of fixed rod, pressing rod and connecting block of the application.

[0025] Figure 10 Structure diagram of fixed rod, pressing rod and connecting block of the application.

[0026] Figure 11 Structure diagram of fixed rod, pressing rod and connecting block of the application.

[0027] Meaning of reference numerals in the drawing: 1 - base, 2 - workbench, 3 - guide plate, 301 - guide groove, 4 - fixed seat, 5 - sliding column, 6 - connecting rod, 7 - steel mesh, 8 - pull rod, 9 - fixed rod, 10 - pressing rod, 101 - connecting block, 11 - rack, 12 - fixed ring, 13 - rotating ring, 14 - top column, 15 - moving seat, 16 - bidirectional screw rod, 17 - motor, 18 - gear ring, 19 - fixed ring, 191 - insertion hole, 20 - insertion column, 21 - connecting plate, 22 - first spring, 23 - wedge block, 24 - sliding rod, 25 - second spring, 26 - positioning plate, 261 - sliding groove, 27 - first guide rod, 28 - clamping block, 29 - third spring, 30 - handle, 31 - extrusion strip, 311 - first inclined surface, 312 - second inclined surface, 32 - screw rod, 33 - second guide rod, 34 - fourth spring. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0029] A positioning device for LED substrate patching, comprising a positioning plate, a first guide rod and a second guide rod. Figures 1-11As shown, it includes a base 1, a workbench 2, a guide plate 3, a positioning plate 26, a fixed seat 4, a sliding column 5, a connecting rod 6, a steel mesh 7, a pull rod 8, a rotating assembly, a fixed ring 12, a rotating ring 13, a top column 14, a fixed ring 19, a plug column 20, a positioning assembly, a connecting plate 21, a first spring 22, a wedge block 23, a sliding rod 24 and a second spring 25. The top of the base 1 is fixedly connected to the workbench 2, the middle of the workbench 2 is fixedly connected to the guide plate 3, the top of the guide plate 3 is provided with a guide groove 301, the top of the guide plate 3 is slidably connected to the positioning plate 26 through the guide groove 301, and the guide plate 3 is connected to the positioning assembly. The front side of the base 1 is fixedly connected to two fixed seats 4, and the sides of the fixed seats 4 close to each other are slidably connected with sliding columns 5. A connecting rod 6 that can only rotate ninety degrees is rotatably connected between the two sliding columns 5. A pull rod 8 is rotatably connected to the fixed seat 4 on one side, the pull rod 8 is fixedly connected to the connecting rod 6, and the connecting rod 6 is detachably connected to the steel mesh 7 , the left and right sides of the middle of the workbench 2 are slidably and rotatably connected to two fixed rings 12, the fixed rings 12 are rotatably connected to the rotating rings 13, the rotating rings 13 are fixedly connected to the top columns 14, the bottom of the top columns 14 are higher than the top of the positioning plate 26, the fixed rings 12 are fixedly connected to the fixed rings 19, the fixed rings 19 are circumferentially spaced with sockets 191, the inner walls of the fixed rings 12 are slidably connected to the plugs 20 adapted to the sockets 191, the connecting rod 6 and the fixed rings 12 A rotating component is connected between them, and a connecting plate 21 is fixedly connected to the plug column 20. The connecting plates 21 are slidably connected to the top column 14. A first spring 22 is fixedly connected between the connecting plate 21 and the fixed ring 12. A wedge block 23 is slidably connected to the top column 14. The connecting plates 21 are located on the inclined surface of the wedge block 23. A sliding rod 24 is slidably connected between the wedge block 23 and the top column 14. A second spring 25 is fixedly connected between the wedge block 23 and the sliding rod 24.

[0030] like Figures 1-8 As shown, the rotating assembly includes a fixed rod 9, a pressure rod 10, a connecting block 101, a rack 11, a gear ring 18, a second guide rod 33 and a fourth spring 34. The bottom of the connecting rod 6 is fixedly connected to two fixed rods 9, and the left and right sides of the workbench 2 are slidably connected to the connecting blocks 101. The rear sides of the connecting blocks 101 are fixedly connected to the pressure rods 10. The sides of the pressure rods 10 that are close to each other are in contact with the fixed rod 9. The rear sides of the left and right pressure rods 10 are close to each other and tilted and extend vertically upward. The sides of the left and right connecting blocks 101 that are away from each other are slidably connected to the second guide rod 33. The second guide rod 33 is fixedly connected to the workbench 2. The fourth spring 34 is fixedly connected between the second guide rod 33 and the connecting block 101. The sides of the left and right connecting blocks 101 that are away from each other are fixedly connected to two racks 11. The bottom of the fixed ring 12 is fixedly connected to the gear ring 18, and the racks 11 are engaged with the gear ring 18.

[0031] At the beginning, the steel net 7 and the pull rod 8 are perpendicular to the base 1, the first spring 22, the second spring 25 and the fourth spring 34 are in the natural state, the insertion column 20 is inserted into the insertion hole 191, the top column 14 is away from each other, the connecting plate 21 is located at the bottom of the inclined surface of the wedge block 23, when the tin needs to be brushed on the substrate, the substrate is placed on the positioning plate 26, the substrate is initially positioned by the positioning assembly, the positioning assembly is pushed to slide along the guide groove 301 to between the four fixing rings 12, thereby completing the feeding of the substrate, the pull rod 8 is pulled downward to make the connecting rod 6 rotate by 90 degrees, so that the steel net 7 rotates by 90 degrees backward and tightly abuts the top of the substrate, in this process, the fixed rod 9 rotates by 90 degrees forward to extrude the inclined part of the pressing rod 10, so that the left and right connecting blocks 101 slide away from each other, the fourth spring 34 is compressed, the left and right racks 11 move away from each other, under the meshing action of the gear ring 18 and the rack 11, the gear ring 18 rotates to drive the fixing ring 12 to rotate, under the action of the insertion column 20 and the fixed ring 19, the fixing ring 12 drives the rotating ring 13 to rotate, the top column 14 rotates to approach the side wall of the substrate, so that the wedge block 23 is pressed against the side wall of the substrate under the extrusion action of the top column 14, thereby completing the secondary positioning of the substrate, when the wedge block 23 is pressed against the side wall of the substrate, the fixing ring 12 continues to rotate, the wedge block 23 is extruded by the side wall of the substrate, so that the wedge block 23 slides through the sliding rod 24 to approach the center of the top column 14, the second spring 25 is compressed, the inclined surface of the wedge block 23 extrudes the connecting plate 21, so that the connecting plate 21 slides upward, the insertion column 20 slides upward to disengage from the insertion hole 191, the first spring 22 is stretched, the fixing ring 12 no longer drives the rotating ring 13 to rotate, thereby avoiding that the top column 14 rotates excessively to extrude and damage the substrate by the wedge block 23, automatically adjusting the contact angle and pressure of the wedge block 23 and the side wall of the substrate, ensuring that substrates of different shapes can be firmly clamped, avoiding deviation or uneven tin brushing caused by irregular substrate shape, and being applicable to the positioning of special-shaped substrates, tin paste is poured on the steel net 7, the tin paste is brushed into the mesh of the steel net 7 through a brush, the tin paste falls on the specified position of the substrate along the mesh, thereby the substrate is brushed with tin, after the tin brushing is completed, the pull rod 8 is pulled upward to make the connecting rod 6 reverse by 90 degrees, so that the steel net 7 rotates by 90 degrees forward to reset, in this process, the fixed rod 9 rotates by 90 degrees backward to move away from the inclined part of the pressing rod 10, the fourth spring 34 restores to the original state to make the left and right connecting blocks 101 slide to approach each other, the left and right racks 11 move to approach each other, the rack 11 drives the gear ring 18 to reverse to make the fixing ring 12 reverse, the insertion column 20 slides along the top of the fixed ring 19, when the insertion column 20 is aligned with the insertion hole 191, the first spring 22 restores to the original state to make the insertion column 20 inserted into the insertion hole 191, the fixing ring 12 drives the rotating ring 13 to reverse, so that the top column 14 rotates away from the side wall of the substrate, the wedge block 23 moves away from the side wall of the substrate, the second spring 25 restores to the original state to make the wedge block 23 slide away from the center of the top column 14, the second spring 25 can ensure that the wedge block 23 is correctly reset, the connecting block 101 slides downward,Then the positioning plate 26 is slid backward along the guide groove 301, the substrate with brushed tin is taken out from the positioning plate 26, thereby completing the brushing tin treatment of the substrate once, and the above steps are repeated to realize the continuous brushing tin of the substrate.

[0032] As shown in Figure 1 , Figure 9 and Figure 10 , the positioning assembly comprises first guide rods 27, clamping blocks 28, third springs 29, handles 30, extrusion strips 31, first inclined surfaces 311 and second inclined surfaces 312, two slide grooves 261 are formed on the top of the positioning plate 26, the first guide rods 27 are fixedly connected in the slide grooves 261, the clamping blocks 28 are slidably connected on the first guide rods 27, the front and rear clamping blocks 28 are connected with each other, the third springs 29 are fixedly connected between the first guide rods 27 and the clamping blocks 28, the handles 30 are fixedly connected on the rear side of the positioning plate 26, the extrusion strips 31 are fixedly connected on the left and right sides of the guide plate 3, the first inclined surfaces 311 and the second inclined surfaces 312 are arranged on the middle of the extrusion strips 31, the clamping blocks 28 are slidably connected with the extrusion strips 31, the rear side of the first inclined surface 311 is close to the third spring 29, the rear side of the first inclined surface 311 is close to the left and right sides of the guide plate 3, the rear side of the second inclined surface 312 is close to the left and right sides of the guide plate 3, the front side of the second inclined surface 312 is close to the guide groove 301, and the front side of the first inclined surface 311 is fixedly connected with the rear side of the second inclined surface 312.

[0033] As shown in Figure 3 and Figure 7 , the device further comprises moving seats 15, bidirectional lead screws 16 and motors 17, the moving seats 15 are rotatably connected to the bottom of the fixed rings 12, the moving seats 15 are slidably connected with the workbench 2, the bidirectional lead screws 16 are threadedly connected between the left and right moving seats 15, the bidirectional lead screws 16 are fixedly connected with the workbench 2, two motors 17 are installed in the workbench 2, and the output shafts of the motors 17 are fixedly connected with the bidirectional lead screws 16.

[0034] At the beginning, the third spring 29 is in a natural state, and the left and right clamping blocks 28 are close to each other. When the substrate is positioned for the first time by the positioning assembly, the positioning plate 26 is pushed to move close to the steel mesh 7 by the handle 30. The left and right clamping blocks 28 are first moved away from each other along the first guide rod 27 under the opening action of the first inclined surface 311, and the third spring 29 is stretched. When the left and right clamping blocks 28 are located at the connection between the first inclined surface 311 and the second inclined surface 312, the distance between the left and right clamping blocks 28 is the maximum opening distance. At this time, the substrate is placed on the positioning plate 26, and the positioning plate 26 is continuously pushed to move forward by the handle 30. The first inclined surface 311 no longer opens the left and right clamping blocks 28, and the third spring 29 restores to its original state to make the left and right clamping blocks 28 slide along the first guide rod 27 and the second inclined surface 312 to move close to each other, so that the left and right clamping blocks 28 clamp and fix the side wall of the substrate. Thus, the substrate is clamped and positioned quickly and stably by the positioning assembly, without the need for manual movement of the left and right clamping blocks 28 and repeated adjustment of the position of the substrate, ensuring that the position of the substrate is consistent each time the tin is brushed. The left and right moving seats 15 are moved close to each other by driving the bidirectional screw rod 16 to rotate by the motor 17, thereby shortening the distance between the left and right moving seats 15. The left and right moving seats 15 are moved away from each other by reversing the bidirectional screw rod 16 driven by the motor 17, thereby increasing the distance between the left and right moving seats 15. At the same time, under the action of the positioning assembly, different sizes of substrates can be positioned, different sizes of substrates can be quickly switched without replacing the clamp, and the utilization rate of the positioning device is improved.

[0035] As shown in Figure 1 , Figure 2 and Figure 11 , the device further comprises a screw rod 32. Two screw rods 32 are rotatably connected to the front side of the base 1, and the two screw rods 32 are in threaded connection with the slide column 5. Rotating the two screw rods 32 at the same time makes the slide column 5 slide upward along the fixed seat 4, thereby raising the height of the steel mesh 7. Reversing the two screw rods 32 at the same time makes the slide column 5 slide downward along the fixed seat 4, thereby lowering the height of the steel mesh 7. This ensures that the steel mesh 7 is in close contact with the substrate, thereby flexibly controlling the distance between the steel mesh 7 and the guide plate 3, ensuring that the steel mesh 7 can closely fit the upper surface of the substrate, achieving uniform tin brushing, being suitable for substrates of different thicknesses, and not causing the slide column 5 to deviate due to the downward pressure when brushing tin.

[0036] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application and not to limit the protection scope of the present application. Although the present application has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present application can be modified or replaced equivalently without departing from the essence and scope of the technical solutions of the present application.

Claims

1. A positioning device for LED substrate patch, comprising a base (1) and a workbench (2), the workbench (2) is connected to the base (1), characterized in that, Also include the guide plate (3), positioning plate (26), fixed seat (4), slide column (5), connecting rod (6), steel mesh (7), pull rod (8), rotating assembly, fixed ring (12), rotating ring (13), top column (14), fixed ring (19), plug post (20) and positioning assembly, the middle of the workbench (2) is connected with guide plate (3), guide plate (3) is opened with guide slot (301), guide plate (3) is connected with positioning plate (26) through guide slot (301) slidingly, guide plate (3) is connected with positioning assembly, the front side of base (1) is connected with two fixed seats (4), the side of fixed seat (4) close to each other is slidingly connected with slide column (5), the connecting rod (6) which can only rotate ninety degrees is rotatably connected between the two slide columns (5), the pull rod (8) is rotatably connected on one side of fixed seat (4), the pull rod (8) is fixedly connected with connecting rod (6), the steel mesh (7) is detachably connected on connecting rod (6), the middle of workbench (2) is slidingly and rotatably connected with two fixed rings (12) on both sides, the rotating ring (13) is rotatably connected on fixed ring (12), the top column (14) is connected on rotating ring (13), the bottom of top column (14) is higher than the top of positioning plate (26), the fixed ring (19) is connected in fixed ring (12), the plug hole (191) is spaced apart on fixed ring (19) in the circumferential direction, the plug post (20) which is matched with plug hole (191) is slidingly connected on the inner wall of fixed ring (12), the rotating assembly is connected between connecting rod (6) and fixed ring (12).

2. The positioning device for LED substrate patches of claim 1, wherein, The rotating assembly comprises fixed rod (9), pressing rod (10), connecting block (101), rack (11), gear ring (18), second guide rod (33) and fourth spring (34), two fixed rods (9) are connected at the bottom of connecting rod (6), connecting block (101) is slidingly connected on both sides in the workbench (2), pressing rod (10) is connected on the rear side of connecting block (101), the side of pressing rod (10) close to each other is in contact with fixed rod (9), the rear side of left and right pressing rod (10) extends upwardly and inclines away from each other, the side of left and right connecting block (101) far away from each other is slidingly connected with second guide rod (33), the second guide rod (33) is fixedly connected with workbench (2), the fourth spring (34) is connected between second guide rod (33) and connecting block (101), two racks (11) are connected on the side of left and right connecting block (101) far away from each other, gear ring (18) is connected at the bottom of fixed ring (12), the rack (11) is engaged with gear ring (18).

3. The positioning device for LED substrate patches of claim 2, wherein, The positioning device further comprises connecting plate (21), first spring (22) and wedge block (23), connecting plate (21) is connected on plug post (20), connecting plate (21) is slidingly connected with top column (14), first spring (22) is connected between connecting plate (21) and fixed ring (12), wedge block (23) is slidingly connected on top column (14), connecting plate (21) is located on the inclined surface of wedge block (23).

4. The positioning device for LED substrate patch according to claim 3, characterized in that: The positioning device further comprises sliding rods (24) and second springs (25), the sliding rods (24) are slidingly connected between the wedge blocks (23) and the top posts (14), and the second springs (25) are connected between the wedge blocks (23) and the sliding rods (24).

5. The positioning device for LED substrate patches of claim 4, wherein, The positioning device further comprises moving seats (15), bidirectional lead screws (16) and motors (17), the bottom of the fixed rings (12) is rotatably connected with the moving seats (15), the moving seats (15) are slidingly connected with the workbench (2), the bidirectional lead screws (16) are threadedly connected between the left and right moving seats (15), the bidirectional lead screws (16) are fixedly connected with the workbench (2), two motors (17) are installed in the workbench (2), and the bidirectional lead screws (16) are fixedly connected with output shafts of the motors (17).

6. The positioning device for LED substrate patches of claim 5, wherein, The positioning assembly comprises first guide rods (27), clamping blocks (28), third springs (29) and handles (30), two sliding grooves (261) are formed in the top of the positioning plate (26) and left and right sides thereof, the first guide rods (27) are connected in the sliding grooves (261), the clamping blocks (28) are slidingly connected on the first guide rods (27), the front and rear clamping blocks (28) are connected with each other, the third springs (29) are connected between the first guide rods (27) and the clamping blocks (28), and the handles (30) are connected to the rear side of the positioning plate (26).

7. The positioning device for LED substrate patches of claim 6, wherein, The positioning assembly further comprises extrusion strips (31), first inclined surfaces (311) and second inclined surfaces (312), the extrusion strips (31) are connected to left and right sides of the guide plate (3), the first inclined surfaces (311) and the second inclined surfaces (312) are arranged in the middle of the extrusion strips (31), and the clamping blocks (28) are slidingly connected with the extrusion strips (31).

8. The positioning device for LED substrate patches of claim 7, wherein, The positioning device further comprises screw rods (32), the front side of the base (1) is rotatably connected with two screw rods (32), and the two screw rods (32) are threadedly connected with the sliding columns (5).

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