Automatic positioning device for unmanned production line station of television backboard

Abstract

The invention relates to the technical field of television backboard production, and provides a television backboard unmanned production line station automatic positioning device which comprises a plurality of punching machines and lifters arranged between every two adjacent punching machines, electric sliding rails are installed on the lifters, and fixing plates are installed at the two ends of a moving rail of each electric sliding rail. A fixing plate is fixedly connected to the punching machine table top, a vacuum suction cup is installed on the fixing plate, a fixing table is fixedly connected to the punching machine table top, a positioning mechanism and a correcting mechanism are arranged on the fixing table, and a screening mechanism is arranged on the lifting machine table top. By arranging the rotatable rotating block, the situation that the television backboard collides with the positioning block when deviation exists in matching of the television backboard and the lower die, the television backboard and the positioning block are abraded, and the positioning accuracy of the positioning block and the integrity of the television backboard are damaged is avoided; by arranging the rotating positioning block, the updating of the positioning surface is realized, the positioning precision of the positioning block is improved, and the service life of the positioning block is prolonged by arranging the positioning block into a plurality of surfaces.

Description

Technical Field

[0001] The invention relates to the technical field of television back panel production, in particular to an automatic positioning device for a workstation of an unmanned production line of a television back panel. Background Art

[0002] As an important component of LCD TV, the quality and production efficiency of TV backplane are directly related to the performance and manufacturing cost of the whole TV. With the continuous advancement of LCD TV technology and the continuous growth of market demand, the production process and equipment of TV backplane are also constantly developing and optimizing. Modern stamping production lines usually adopt a multi-station, multi-process continuous operation mode, equipped with high-precision, high-speed stamping machines and automated conveying systems, which can achieve fast and accurate stamping and conveying of TV backplanes. The processing of TV back panels usually requires trimming, punching, and stamping. There are burrs on the edge of the TV back panel after trimming, which is easy to wear the positioning parts during the next positioning, thereby reducing the positioning accuracy of the positioning parts and easily scratching the staff. During the processing, pins are usually set around the mold to limit the movement of the TV back panel to prevent the TV back panel from shifting during the processing. In order to ensure the processing accuracy, the positioning pins will fit closely with the TV back panel, which leads to: 1. During the positioning process, the TV back panel is limited, and the contact area is small. After the force is applied, the local pressure on the TV back panel is large, which can easily cause the TV back panel to deform; 2. During transportation, the TV back panel and the positioning pins are prone to collision, affecting the accuracy of the positioning pins.

[0003] To this end, the present invention proposes an automatic positioning device for a workstation of an unmanned production line of a television back panel. Summary of the invention

[0004] The invention provides an automatic positioning device for a workstation of an unmanned production line of a television back panel, which solves the problems existing in the background technology through trigger-type positioning.

[0005] The technical solution of the present invention is as follows: An automatic positioning device for a workstation of an unmanned production line of a TV back panel, comprising: a punching machine, a trimming machine, and a bending machine arranged in sequence, wherein a transfer module is arranged between the punching machine and the trimming machine, and between the trimming machine and the bending machine, the transfer module comprises a transfer platform, a lift and a rotating mechanism are installed on the top of the transfer platform, and an electric slide rail is installed through the lift, fixed plates are rotatably installed at both ends of the bottom of the electric slide rail, and a vacuum suction cup is installed on the fixed plate, the punching machine, the trimming machine, and the bending machine are fixedly connected to the fixed platform, a positioning mechanism and a limiting mechanism are arranged on the fixed platform, a grinding mechanism is arranged on the transfer platform between the trimming machine and the bending machine, and a lower mold is installed on the fixed platform; The positioning mechanism comprises four I-shaped grooves provided on the fixed platform, the four I-shaped grooves are arranged around the lower die, two rotating shafts are symmetrically installed in the I-shaped grooves, rotating blocks are sleeved on the outer sides of the rotating shafts, a fixing rod is provided between the opposite sides of the two rotating blocks away from one end of the rotating shaft, a positioning block is rotatably connected to the fixing rod, and the positioning block is provided with a plurality of surfaces; The limiting mechanism includes two limiting sleeves slidably connected to the fixed rod and a plurality of limiting grooves opened on the two end faces of the positioning block, the two limiting sleeves are respectively located on both sides of the positioning block, a spring is installed between the limiting sleeve and the rotating block, and a plurality of limiting pins are fixedly connected to one side close to the positioning block, and the plurality of limiting pins match the plurality of limiting grooves.

[0006] Preferably, a gear 1 is fixedly connected to the outside of the rotating shaft, a rack is slidably connected to the two ends of the I-shaped groove, the rack meshes with the gear 1, a slide groove 1 is provided in the fixed platform and at the two ends of the I-shaped groove, the rack and the slide groove 1 are located on the same straight line, and a spring 2 is installed between one end of the rack and the inner wall of the slide groove 1, a slide groove 2 is provided at the bottom of the two ends of the I-shaped groove, an L-shaped block is slidably connected in the slide groove 2, a spring 3 is installed between the bottom side of the L-shaped block and the bottom of the slide groove 2, the slide groove 2 is located below the rack, and a slot matching one end of the L-shaped block is provided at the bottom of the rack.

[0007] Preferably, the end of the rack away from gear one is an inclined surface, and slots are provided at the bottom of both ends of the I-shaped groove, and the slots are located below the end of the rack with the inclined surface. The fixed plate is fixedly connected with trigger columns and trigger blocks on all sides, the length of the trigger block is greater than the length of the trigger column, and the trigger column and the trigger block correspond to the slot and the slide groove two respectively.

[0008] Preferably, the rotating mechanism includes a square groove opened on the top of the transfer platform, the bottom of the square groove is rotatably connected to a round table, a motor for driving the round table to rotate is installed in the transfer platform, and a placement plate is fixedly connected to one end of the round table close to the elevator.

[0009] Preferably, a second motor is installed on the electric slide rail, and a driving shaft of the second motor is connected to a fixed plate.

[0010] Preferably, the grinding mechanism comprises two electric push rods 2 symmetrically installed on both sides of the square groove 1 on the top of the transfer platform, the output ends of the electric push rods 2 are fixedly connected with a clamping plate, and the clamping plate is slidably connected to the top of the transfer platform, and a square groove 2 is opened on both sides of each electric push rod 2 on the top of the transfer platform, an automatic telescopic column is installed in the square groove 2, a slide plate is fixedly connected to the output end of the automatic telescopic column, and the slide plate is slidably connected to the square groove 2, an electric push rod 3 is installed on the slide plate, and a slider is also slidably connected between the electric push rod 3 and the electric push rod 2 on the slide plate, the output end of the electric push rod 3 is fixedly connected to the slide plate, and an arc ring is fixedly connected to the slide plate, and a grinding roller is arranged between the two arc rings located on the same side of the two electric push rods 2, a rotating shaft is arranged at the center of the grinding roller, and the rotating shaft and the grinding roller are connected by a flexible connecting piece, and the two ends of the rotating shaft pass through the inner sides of the two arc rings respectively, and the passing end is connected with gear 2.

[0011] Preferably, motor three is installed on the slider, and the driving shaft of motor three is connected to gear three through the slider, and gear three is meshed with gear two. The side of the slider away from motor three is rotatably connected to a long ring, and the side of gear three away from motor three is fixedly connected to a boss, and the boss and the rotating shaft of the grinding roller are both located in the long ring.

[0012] Preferably, elastic rubber is provided between the grinding roller and the rotating shaft.

[0013] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention provides a rotatable rotating block. When the vacuum suction cup lowers the TV back panel, the positioning block and the parts outside the I-shaped groove are rotated into the I-shaped groove to avoid the TV back panel and the positioning block from colliding when there is a mismatch between the TV back panel and the lower mold, causing wear on the TV back panel and the positioning block, and damaging the positioning accuracy of the positioning block and the integrity of the TV back panel.

[0014] 2. The present invention sets a rotatable positioning block, rotates the positioning block so that its other surface contacts the TV back panel, and then releases the limiting sleeve. The limiting sleeve re-fixes the positioning block to the limiting groove through the limiting pin under the elastic force of spring 1, thereby realizing the updating of the positioning surface, increasing the positioning accuracy of the positioning block, and increasing the service life of the positioning block by setting multiple surfaces of the positioning block.

[0015] 3. The present invention grinds the edge of the TV back panel through a grinding mechanism, thereby reducing the wear of the positioning member caused by burrs, thereby improving the positioning accuracy of the positioning member. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a plan view schematic diagram of the device of the present invention; Figure 2is a perspective view of the device of the present invention; Figure 3 is a three-dimensional diagram of a fixing platform of the present invention; Figure 4 The present invention Figure 3 A partial enlarged view of middle A; Figure 5 The present invention Figure 3 A partial stereogram of Figure 6 The present invention Figure 3 A partial stereogram from another angle; Figure 7 The present invention Figure 6 A further cutaway perspective view of Figure 8 is a cross-sectional view of the positioning mechanism and the limiting mechanism of the present invention; Fig. 9 is a three-dimensional diagram of the table top of the present invention; Fig.10 is a three-dimensional diagram of the rotating mechanism of the present invention; Fig.11 The present invention Fig. 9 A partial enlarged view of B in the middle; Fig.12 It is a partial stereogram of the grinding mechanism in the present invention; Fig.13 is a cross-sectional perspective view of the grinding mechanism of the present invention; Fig.14 It is a three-dimensional diagram of the upper structure of the lift of the present invention.

[0017] In the figure: 1. Punching machine; 2. Transfer module; 21. Transfer table; 22. Lifter; 3. Electric slide rail; 31. Motor 2; 4. Fixed plate; 41. Trigger column; 42. Trigger block; 5. Vacuum suction cup; 6. Fixed table; 7. Positioning mechanism; 71. I-shaped groove; 72. Rotating shaft; 73. Rotating block; 74. Fixed rod; 75. Positioning block; 76. Gear 1; 77. Rack; 78. Slide 1; 79. Spring 2; 710. Slide 2; 711. L-shaped block; 712. Spring 3; 713. Slot; 714. Slot; 8. Limiting mechanism; 81. Limiting sleeve; 82. Limiting Positioning slot; 83, spring one; 84, limit pin; 9, rotating mechanism; 91, square slot one; 92, round table; 93, motor one; 94, placing plate; 10, grinding mechanism; 101, electric push rod two; 102, square slot two; 103, clamping plate; 104, automatic telescopic column; 105, sliding plate; 106, electric push rod three; 107, sliding block; 108, arc ring; 109, grinding roller; 1010, motor three; 1011, gear three; 1012, gear two; 1013, long ring; 1014, convex column; 11, lower die; 12, trimming machine; 13, bending machine. DETAILED DESCRIPTION

[0018] The following embodiments of the present invention are described in further detail in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0019] The present invention provides an automatic positioning device for a workstation of an unmanned production line of a TV back panel, comprising: a punching machine 1, a trimming machine 12, and a bending machine 13 arranged in sequence, characterized in that: a transfer module 2 is arranged between the punching machine 1 and the trimming machine 12, and between the trimming machine 12 and the bending machine 13, the transfer module 2 comprises a transfer platform 21, a lift 22 and a rotating mechanism 9 are installed on the top of the transfer platform 21, and an electric slide rail 3 is installed through the lift 22, fixed plates 4 are rotatably installed at both ends of the bottom of the electric slide rail 3, and a vacuum suction cup 5 is installed on the fixed plate 4, the punching machine 1, the trimming machine 12, and the bending machine 13 are fixedly connected to a fixed platform 6, a positioning mechanism 7 and a limiting mechanism 8 are arranged on the fixed platform 6, a grinding mechanism 10 is arranged on the transfer platform 21 between the trimming machine 12 and the bending machine 13, and a lower mold 11 is installed on the fixed platform 6; like Figure 1-2 As shown, in the initial state, the two fixed plates 4 on the two lifts 22 are located between the two punching machines 1 and the trimming machine 12, and between the trimming machine 12 and the bending machine 13. The electric slide 3 controls the fixed plate 4 to move to the left, so that the fixed plate 4 on the left side of the electric slide 3 moves to just above the lower die 11 of the punching machine 1 and the trimming machine 12 on the left, and the fixed plate 4 on the right side of the electric slide 3 moves to just above the transfer platform 21, and the fixed plate 4 is driven downward by the lift 22 to control the vacuum suction cup 5 to adsorb and fix the TV back panel on the lower die 11 of the punching machine 1 and the trimming machine 12 and the TV back panel on the transfer platform 21, and then the electric slide 3 controls the two The fixed plate 4 moves to the right, so that the fixed plate 4 on the left side of the electric slide rail 3 moves to the top of the transfer platform 21, and the fixed plate 4 on the right side of the electric slide rail 3 moves to the top of the lower mold 11 of the trimming machine 12 and the bending machine 13, and the fixed plate 4 is driven downward by the elevator 22 to control the vacuum suction cup 5 to release the TV back panel, so that the TV back panel is transferred from left to right. After each transfer is completed, the electric slide rail 3 controls the fixed plate 4 to reset, and starts the punching machine 1, the trimming machine 12 and the bending machine 13 to punch, trim and bend the TV back panel respectively, so as to complete one transfer and processing; repeat this process to realize the continuous transportation and processing of the TV back panel.

[0020] The positioning mechanism 7 includes four I-shaped grooves 71 provided on the fixed platform 6. The four I-shaped grooves 71 are arranged around the lower mold 11. Two rotating shafts 72 are symmetrically installed in the I-shaped grooves 71. A rotating block 73 is sleeved on the outer side of the rotating shaft 72. A fixing rod 74 is provided between the opposite sides of the two rotating blocks 73 away from one end of the rotating shaft 72. A positioning block 75 is rotatably connected to the fixing rod 74. The positioning block 75 is provided with multiple surfaces. Gears 1 76 are fixedly connected to the outside of the rotating shaft 72, and racks 77 are slidably connected to the two ends of the I-shaped groove 71, and the racks 77 are meshed with the gears 1 76. Slide grooves 1 78 are respectively provided in the fixed platform 6 and located at the two ends of the I-shaped groove 71. The racks 77 are located on the same straight line as the slide groove 1 78, and a spring 2 79 is installed between one end of the rack 77 and the inner wall of the slide groove 1 78. Slide grooves 2 710 are respectively provided at the bottom of the two ends of the I-shaped groove 71. An L-shaped block 711 is slidably connected in the slide groove 2 710, and a spring 3 712 is installed between the bottom side of the L-shaped block 711 and the bottom of the slide groove 2 710. The slide groove 2 710 is located below the rack 77, and a slot 713 matching one end of the L-shaped block 711 is provided at the bottom of the rack 77.

[0021] The end of the rack 77 away from the gear one 76 is an inclined surface, and slots 714 are provided at the bottom of both ends of the I-shaped groove 71. The slots 714 are located below the end of the rack 77 with the inclined surface. The bottom of the fixed plate 4 is provided with a trigger column 41 and a trigger block 42 corresponding to the positions of the slots 714 and the slide groove 2 710 respectively, and the length of the trigger block 42 is greater than the length of the trigger column 41.

[0022] like Figure 2-7 As shown, one end of the L-shaped block 711 is located in the slot 713 of the rack 77 to fix the rack 77. During the transportation process, when the fixed plate 4 moves downward, since the length of the trigger block 42 is greater than the length of the trigger column 41, the trigger block 42 on the fixed plate 4 first contacts the L-shaped block 711 in the second slide groove 710 and presses the L-shaped block 711 downward to make it enter the second slide groove 710, thereby releasing the fixation of the L-shaped block 711 on the rack 77, and the fixed plate 4 continues to move downward until the trigger column 41 contacts the inclined surface of the rack 77 and squeezes the rack 77, and pushes the rack 77 toward the direction of the first slide groove 78 through the inclined surface. During the movement of the rack 77, the gear 76 meshing therewith drives the shaft 72 to rotate 90 degrees, so that the positioning block 75 on the shaft 72 rotates into the I-shaped groove 71, thereby facilitating the placement of the TV back panel between the various positioning blocks 75 or facilitating the removal of the TV back panel from between the various positioning blocks 75. In this way, when the vacuum suction cup 5 puts down the TV back panel or grabs the TV back panel, the positioning block 75 is separated from the TV back panel or the lower mold 11 in advance, so as to prevent the TV back panel from colliding with the positioning block 75 during the process of lowering the TV back panel or grabbing the TV back panel, resulting in damage to the TV back panel.

[0023] When the fixing plate 4 moves upward, the trigger column 41 is first removed from the slot 714, and the rack 77 is reset under the elastic force of the spring second 79, and drives the rotating shaft 72 to rotate 90° in the opposite direction through the gear one 76, thereby causing the positioning block 75 on the rotating shaft 72 to rotate 90°. In this way, after the vacuum suction cup 5 lowers the TV back panel, the four positioning blocks 75 around the lower mold 11 simultaneously clamp and position the TV back panel on the lower mold 11. After the fixing plate 4 continues to move upward, the L-shaped block 711 loses the restriction of the trigger block 42 and slides upward into the slot 713 of the rack 77 under the elastic force of the spring three 712 to fix the rack 77, thereby fixing the positioning block 75 through the gear one 76 and the rotating shaft 72, thereby improving the reliability of the positioning block 75 fixing the TV back panel, and preventing the TV back panel from being offset during the stamping process, thereby causing damage to the TV back panel and inaccurate stamping position.

[0024] The positioning is performed by the positioning mechanism 7, which has a larger contact area than the traditional positioning pins, thereby reducing the probability of deformation of the TV back panel.

[0025] As the production time increases, the wear between the TV back plate and the positioning block 75 increases, which will reduce the accuracy of positioning; Figure 4 , Figure 8 As shown, the limit pins 84 on the limit sleeve 81 are located in the limit grooves 82 at both ends of the positioning block 75. When the positioning block 75 is highly worn, the limit sleeves 81 at both ends of the positioning block 75 are pushed to both sides to release the fixation of the limit pins 84 to the limit grooves 82, and then the positioning block 75 is rotated to make its other surface contact with the TV back panel, and then the limit sleeve 81 is released. The limit sleeve 81 re-fixes the positioning block 75 to the limit groove 82 through the limit pins 84 under the elastic force of the spring 1 83, thereby realizing the renewal of the positioning surface, thereby ensuring the positioning accuracy of the positioning block 75, and by providing the positioning block 75 with multiple surfaces, the service life of the positioning block 75 is increased. Example

[0026] like Fig. 9 As shown, the rotating mechanism 9 includes a square groove 91 opened on the top of the transfer platform 21, and a round table 92 is rotatably connected to the bottom of the square groove 91. A motor 93 for driving the round table 92 to rotate is installed in the transfer platform 21, and a placement plate 94 is fixedly connected to one end of the round table 92 close to the elevator 22.

[0027] like Fig.14 As shown, a second motor 31 is installed on the electric slide rail 3 , and a driving shaft of the second motor 31 is connected to the fixed plate 4 .

[0028] like Figure 9-13As shown, the grinding mechanism 10 includes two electric push rods 101 symmetrically installed on both sides of the square groove 1 91 at the top of the transfer platform 21, the output end of the electric push rod 101 is fixedly connected with a clamping plate 103, and the clamping plate 103 is slidably connected to the top of the transfer platform 21, and a square groove 102 is opened on both sides of each electric push rod 101 at the top of the transfer platform 21, and an automatic telescopic column 104 is installed in the square groove 102, and a slide plate 105 is fixedly connected to the output end of the automatic telescopic column 104, and the slide plate 105 is slidably connected to the square groove 102. The slide plate 105 An electric push rod 3 106 is installed on it, and a slider 107 is slidably connected between the electric push rod 3 106 and the electric push rod 2 101 on the slide plate 105, the output end of the electric push rod 3 106 is fixedly connected to the slider 107, and an arc ring 108 is fixedly connected to the slider 107. A grinding roller 109 is arranged between the two arc rings 108 located on the same side of the two electric push rods 2 101, and a rotating shaft is arranged at the center of the grinding roller 109. Both ends of the rotating shaft pass through the inner sides of the two arc rings 108 respectively, and the passing end is connected to the gear 2 1012.

[0029] A motor three 1010 is installed on the slider 107, and the driving shaft of the motor three 1010 is connected to the gear three 1011 through the slider 107. The gear three 1011 is meshed with the gear two 1012. The side of the slider 107 away from the motor three 1010 is rotatably connected to the long ring 1013, and the side of the gear three 1011 away from the motor three 1010 is fixedly connected to the boss 1014. The boss 1014 and the rotating shaft of the grinding roller 109 are both located in the long ring 1013.

[0030] Elastic rubber is arranged between the grinding roller 109 and the rotating shaft to reduce the rigid impact between the grinding roller 109 and the rotating shaft, making the grinding process more gentle.

[0031] like Fig. 9 , Figure 12-13 As shown, after the trimming machine 12 cuts off the redundant part of the TV back panel, there are burrs on the edge of the TV back panel after trimming, which is easy to cause wear to the positioning member during the next positioning, thereby reducing the positioning accuracy of the positioning member. Therefore, the edge of the TV back panel is polished by the polishing mechanism 10 arranged on the transfer table 21 between the trimming machine 12 and the bending machine 13: when the TV back panel is placed on the placement plate 94, the electric push rod 2 101 is started to push the two clamping plates 103 to clamp the two sides of the TV back panel, and then the electric push rod 3 106 is started to push the slider 107 to the other two sides of the TV back panel, and the polishing roller 109 is fitted with the other two sides of the TV back panel, and then the motor 3 1010 is started to drive the gear 3 1011 to rotate, and the gear 1011 drives the gear 2 1012 to rotate, thereby driving the polishing roller 109 to rotate, and the edge of the TV back panel is polished. At the same time, the gear 3 1011 rotates to make the convex column 1014 on the gear 1011 drive the long strip ring 1013 to rotate, as shown in FIG. Fig.12As shown, when the boss 1014 rotates 90° clockwise, the boss 1014 drives the long ring 1013 to swing upward, thereby driving the grinding roller 109 to swing upward. When the boss 1014 continues to rotate 180° clockwise, the boss 1014 drives the long ring 1013 to swing downward, thereby causing the grinding roller 109 to swing downward. When the boss rotates 90° clockwise again, it drives the long ring 1013 to swing upward, thereby causing the grinding roller 109 to swing upward and return to the starting position, and so on. The long ring 1013 drives the grinding roller 109 to swing back and forth on the arc ring 108; since the long ring 1013 and the arc ring 108 restrict the grinding roller 109 and keep the grinding roller 109 stable, the grinding roller 109 can not only rotate on its own, but also move around the edge of the TV back panel, so that the grinding is more uniform and more complete; at the same time, the grinding roller 109 moves in a circular shape, which can grind the edge of the TV back panel into an arc, improve the roundness of the edge of the TV back panel, and reduce the probability of burrs scratching staff.

[0032] like Fig.10 , Fig.14 As shown, after the two sides of the TV back panel are polished by the polishing mechanism 10, the polishing mechanism 10 is restored to its original position and the motor 1 93 is started to drive the round table 92 and the placement plate 94 to rotate 90°, and then the other two sides of the TV back panel are polished by the polishing mechanism 10. After all the polishing is completed, during the process of the fixed plate 4 moving down to remove the TV back panel, the motor 2 31 is started to drive the fixed plate 4 to rotate 90°, so that the TV back panel is reset, which is convenient for the bending machine 13 to work, saves the time of rotating the TV back panel, and improves production efficiency.

[0033] The embodiments of the present invention are provided for the purpose of illustration and description. Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations of the present invention. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. An automatic positioning device for a TV back panel unmanned production line station, comprising: A punching machine (1), a trimming machine (12), and a bending machine (13) are arranged in sequence, characterized in that a transfer module (2) is arranged between the punching machine (1) and the trimming machine (12), and between the trimming machine (12) and the bending machine (13), the transfer module (2) comprising a transfer platform (21), a lift (22) and a rotating mechanism (9) being installed on the top of the transfer platform (21), and an electric slide rail (3) being installed via the lift (22), the electric slide rail (3) Both ends of the bottom are rotatably mounted with fixed plates (4), a vacuum suction cup (5) is mounted on the fixed plates (4), the punching machine (1), the trimming machine (12) and the bending machine (13) are fixedly connected to fixed tables (6), a positioning mechanism (7) and a limiting mechanism (8) are arranged on the fixed table (6), a grinding mechanism (10) is arranged on the transfer table (21) between the trimming machine (12) and the bending machine (13), and a lower die (11) is mounted on the fixed table (6); The positioning mechanism (7) comprises four I-shaped grooves (71) formed on the fixed platform (6), the four I-shaped grooves (71) being arranged around the lower mold (11), two rotating shafts (72) being symmetrically mounted in the I-shaped grooves (71), a rotating block (73) being sleeved on the outer side of the rotating shaft (72), a fixing rod (74) being arranged between opposite sides of the two rotating blocks (73) away from one end of the rotating shaft (72), a positioning block (75) being rotatably connected to the fixing rod (74), and the positioning block (75) being provided with a plurality of surfaces; The limiting mechanism (8) comprises two limiting sleeves (81) slidably connected to the fixing rod (74) and a plurality of limiting grooves (82) provided on two end surfaces of the positioning block (75), the two limiting sleeves (81) being respectively located on two sides of the positioning block (75), a spring (83) being installed between the limiting sleeves (81) and the rotating block (73), and a plurality of limiting pins (84) being fixedly connected to a side close to the positioning block (75), the plurality of limiting pins (84) matching with the plurality of limiting grooves (82).

2. The automatic positioning device for the TV back panel unmanned production line as claimed in claim 1, characterized in that: The outer side of the rotating shaft (72) is fixedly connected with a gear (76), and the two ends of the I-shaped groove (71) are slidably connected with a rack (77), and the rack (77) is meshed with the gear (76). The fixed platform (6) is provided with a slide groove (78) at both ends of the I-shaped groove (71), and the rack (77) and the slide groove (78) are located on the same straight line, and a spring is installed between one end of the rack (77) and the inner wall of the slide groove (78). Spring 2 (79), two ends of the I-shaped groove (71) are respectively provided with a second slide groove (710), an L-shaped block (711) is slidably connected in the second slide groove (710), a spring 3 (712) is installed between the bottom side of the L-shaped block (711) and the bottom of the second slide groove (710), the second slide groove (710) is located below the rack (77), and a slot (713) matching one end of the L-shaped block (711) is provided at the bottom of the rack (77).

3. The automatic positioning device for the TV back panel unmanned production line as claimed in claim 2, characterized in that: The end of the rack (77) away from the first gear (76) is an inclined surface, and slots (714) are provided at the bottom of both ends of the I-shaped groove (71), and the slots (714) are located below the end of the rack (77) provided with the inclined surface. The fixing plate (4) is fixedly connected with trigger columns (41) and trigger blocks (42) on all sides, and the length of the trigger blocks (42) is greater than that of the trigger columns (41), and the trigger columns (41) and the trigger blocks (42) correspond to the slots (714) and the second slide groove (710) respectively.

4. The automatic positioning device for the TV back panel unmanned production line as claimed in claim 3, characterized in that: The rotating mechanism (9) comprises a square groove (91) formed on the top of the transfer platform (21), a round platform (92) being rotatably connected to the bottom of the square groove (91), a motor (93) for driving the round platform (92) to rotate being installed in the transfer platform (21), and a placement plate (94) being fixedly connected to one end of the round platform (92) close to the elevator (22).

5. The automatic positioning device for the TV back panel unmanned production line as claimed in claim 1, characterized in that: A second motor (31) is mounted on the electric slide rail (3), and a drive shaft of the second motor (31) is connected to the fixed plate (4).

6. The automatic positioning device for the TV back panel unmanned production line as claimed in claim 5, characterized in that: The grinding mechanism (10) comprises two electric push rods (101) symmetrically mounted on both sides of a square groove (91) at the top of a transfer platform (21), the output end of each electric push rod (101) being fixedly connected to a clamping plate (103), and the clamping plate (103) being slidably connected to the top of the transfer platform (21), and both sides of each electric push rod (101) at the top of the transfer platform (21) being provided with a square groove (102), an automatic telescopic column (104) being mounted in the square groove (102), the output end of each automatic telescopic column (104) being fixedly connected to a slide plate (105), and the slide plate (105) being slidably connected to the square groove (102), and an electric push rod (105) being mounted on the slide plate (105). Rod three (106), a slider (107) is slidably connected between the electric push rod three (106) and the electric push rod two (101) on the slide plate (105), the output end of the electric push rod three (106) is fixedly connected to the slider (107), an arc ring (108) is fixedly connected to the slider (107), a grinding roller (109) is arranged between the two arc rings (108) located on the same side of the two electric push rods two (101), a rotating shaft is arranged at the center of the grinding roller (109), and the rotating shaft and the grinding roller (109) are connected by a flexible connecting piece, and the two ends of the rotating shaft pass through the inner sides of the two arc rings (108) respectively, and the passing end is connected to the gear two (1012).

7. The automatic positioning device for the TV back panel unmanned production line as claimed in claim 6, characterized in that: A motor three (1010) is mounted on the slider (107); the drive shaft of the motor three (1010) is connected to a gear three (1011) via the slider (107); the gear three (1011) meshes with the gear two (1012); a side of the slider (107) away from the motor three (1010) is rotatably connected to a long ring (1013); a side of the gear three (1011) away from the motor three (1010) is fixedly connected to a boss (1014); the boss (1014) and the rotating shaft of the grinding roller (109) are both located within the long ring (1013).

8. The automatic positioning device for the TV back panel unmanned production line as claimed in claim 7, characterized in that: Elastic rubber is provided between the grinding roller (109) and the rotating shaft.

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