Display screen backboard flattening tool

Abstract

The display screen backboard flattening tool comprises a base and a bearing plate, the bearing plate is fixedly connected to the base, the side, away from the base, of the bearing plate is slidably connected with a plurality of heightening blocks, and the ends, close to the base, of the heightening blocks are fixedly connected with first racks; the first racks are arranged in the sliding direction of the heightening blocks fixedly connected with the first racks in a one-to-one correspondence mode, the first racks are located on the side, close to the base, of the bearing plate, and driven gears with the same number as the first racks are arranged on the side, close to the first racks, of the bearing plate. The driven gears are meshed with the first racks in a one-to-one correspondence mode and located on the same side of the first racks, a driving gear is rotationally connected to the side, close to the driven gears, of the bearing plate, and the driving gear is meshed with all the driven gears. The device has the effects that the driving gear is rotated to drive all the block-up blocks to get close to or away from each other, and the convenience of adjusting the positions of all the block-up blocks on the bearing plate is improved.

Description

Technical Field

[0001] This application relates to the field of display screen back panel processing technology, and in particular to a display screen back panel flattening tool. Background Technology

[0002] The display screen back panel is an important component of the display screen, mainly used to protect the internal structure and wiring of the display screen. The display screen back panel is usually produced by injection molding. When the display screen back panel is removed from the injection mold, it often still has residual heat. During the cooling process, due to the uneven distribution of internal thermal stress, the display screen back panel will deform. Therefore, it is necessary to flatten the display screen back panel during cooling.

[0003] In related technologies, Chinese Patent Publication No. CN219851462U discloses a flattening device, which includes a fixed platform, a driving device, and a pressure plate. The driving device is disposed on the platform of the fixed platform, and the pressure plate is disposed on the side of the output end of the driving device near the fixed platform. The driving device drives the pressure plate to move closer to the fixed platform. A pressure rod is disposed on the side of the pressure plate near the fixed platform. A clamping device for fixing a metal back plate is disposed on the side of the platform of the fixed platform near the pressure plate. The clamping device includes a support plate and a shim for raising the metal back plate. The support plate is disposed on the side of the platform of the fixed platform near the pressure plate. Multiple shims are disposed. The support plate has an adjustment hole with the same number as the number of shims. An adjustment rod is disposed on the shim, which passes through and slides in the adjustment hole. The shims cooperate to form a limiting groove for placing the metal back plate.

[0004] Regarding the aforementioned technologies, the inventors believe that before using the aforementioned flattening device to flatten the back panel of the display screen, it is necessary to adjust the position of each shim sliding on the support plate in sequence so that the size of the limiting groove is consistent with the size of the back panel of the display screen to be flattened, and then lock the position of each shim in sequence. The operation steps of adjusting all the shims and locking them one by one are cumbersome and have room for improvement. Utility Model Content

[0005] To address the cumbersome process of adjusting and locking all the shims one by one before flattening the back panel of a display screen using a flattening device, this application provides a flattening fixture for the back panel of a display screen.

[0006] The display screen backplate flattening fixture provided in this application adopts the following technical solution:

[0007] A display screen back panel flattening fixture includes a base and a support plate for mounting the display screen back panel. The support plate is fixedly connected to the base. A plurality of shims for placing the display screen back panel are slidably connected to the side of the support plate away from the base. A first rack is fixedly connected to the end of each shim near the base. Each first rack is arranged along the sliding direction of the shim fixedly connected to it. The first rack is located on the side of the support plate near the base. A number of driven gears, the same as the number of first racks, are provided on the side of the support plate near the first racks. Each driven gear meshes with a first rack and is located on the same side of the first rack. A driving gear is also rotatably connected to the side of the support plate near the driven gears, and the driving gear meshes with all the driven gears.

[0008] By adopting the above technical solution, when the driving gear is rotated, all the driven gears rotate synchronously and in the same direction. Since all the driven gears are located on the same side of the first rack that meshes with them, when the first rack is driven by the driven gear, it moves synchronously toward or away from the driving gear, thereby enabling all the shims to move closer to or away from the driving gear, which improves the convenience of adjusting the position of all the shims sliding on the support plate.

[0009] Optionally, the support plate has the same number of elongated holes as the number of driven gears. The elongated holes are arranged along the length direction perpendicular to the first rack. A rotating column passes through the driven gear and slides within the elongated holes. A first locking block is provided on the side of the rotating column away from the driven gear. The first locking block abuts against the side of the support plate away from the driven gear. When the driven gear slides to the side away from the first rack, the driven gear and the first rack separate, and the first rack disengages from the drive gear.

[0010] By adopting the above technical solution, the passive gear is slidably connected to the support plate by opening an elongated hole on the support plate. When it is necessary to adjust the position of one of the shims separately, the passive gear is slid to the side away from the first rack, so that the first rack can be disengaged from the drive of the active gear, which improves the flexibility of driving the adjustment shim to slide on the support plate.

[0011] Optionally, a second locking block is fixedly connected to the rotating column, the second locking block abutting against the side of the bearing plate near the driven gear, and the first locking block is threadedly connected to the side of the rotating column away from the driven gear.

[0012] By adopting the above technical solution, when the driven gear is moved to mesh with the driving gear, the first locking block is rotated so that the first locking block abuts against the side of the bearing plate away from the base. At this time, the second locking block abuts against the side of the bearing plate close to the base. The two cooperate to lock the sliding column in the long waist hole, which improves the stability of fixing the driven gear in the position of meshing with the driving gear.

[0013] Optionally, the support plate has twice the number of limiting holes as the number of the elongated holes. Each elongated hole has one limiting hole on each side. The support plate has the same number of limiting posts as the limiting holes. The limiting posts are inserted one-to-one and slide within the limiting holes. The support plate has the same number of connecting posts as the elongated holes on the side away from the driven gear. The two ends of the same connecting post are fixedly connected to the ends of the limiting posts on both sides of the same elongated hole. When the first locking block abuts against the side of the connecting post near the driving gear, the driven gear and the driving gear mesh.

[0014] By adopting the above technical solution, when the passive gear is moved to mesh with the active gear, the limiting post is inserted into the limiting hole so that the connecting post abuts against the side of the first locking block away from the active gear. When the active gear drives the passive gear, the passive gear is pushed by the active gear, but it cannot be displaced due to the first locking block abutting against the connecting post, thus improving the stability of fixing the passive gear in the position where it meshes with the active gear.

[0015] Optionally, an abutment block is fixedly connected to the end of the limiting post away from the connecting post. When the connecting post drives the limiting post to move away from the base so that the first locking block can slide, the abutment block abuts against the side of the bearing plate near the base.

[0016] By adopting the above technical solution, when the connecting column is pulled to the side away from the bearing plate so that the first locking block slides on the bearing plate, the abutting block abuts against the side of the bearing plate near the base, so that the limiting column does not disengage from the limiting hole. The user only needs to pull the connecting column, move the first locking block, and then push the connecting column back to its original position to realize the movement and locking of the first locking block. There is no need to repeatedly align the limiting column with the limiting hole and then insert it, which improves the convenience of adjusting the position of the first locking block.

[0017] Optionally, a second rack is slidably connected to the side of the support plate near the drive gear, a locking rod is hinged to the side of the second rack away from the drive gear, a connecting block is hinged to the end of the locking rod away from the second rack, and a bolt is provided on the support plate, the bolt passing through the support plate and threadedly connected to the connecting block.

[0018] By adopting the above technical solution, when the connecting block moves closer to the bearing plate by rotating the bolt, the length of the hypotenuse of the right triangle remains unchanged. If one right-angled side becomes shorter, the other right-angled side becomes longer. That is, the distance between the second rack and the bolt becomes longer. The second rack slides away from the bolt and meshes with the driving gear to lock the driving gear, thereby improving the stability of the driving gear at a certain rotation angle.

[0019] Optionally, a first pulley is fixedly connected to the side of the drive gear away from the support plate. The first pulley and the drive gear are coaxially arranged. The base extends outside the support plate, and a second pulley is rotatably connected to the side of the base extending outside the support plate. The first pulley and the second pulley are driven by a belt.

[0020] By adopting the above technical solution, compared to rotating the drive gear by inserting it into the gap between the support plate and the base, the arrangement of the first pulley and the second pulley allows the user to drive the drive gear to rotate by rotating the second pulley located outside the gap between the support plate and the base, thus improving the convenience of rotating the drive gear.

[0021] Optionally, a handle is fixedly connected to the side of the second pulley away from the base.

[0022] By adopting the above technical solution, the handle provides the user with a clear and easy-to-grip fulcrum for rotating the second pulley, making it easier for the user to control the rotation of the gear and improving the convenience of rotating the second pulley.

[0023] Optionally, it also includes a pressure block for applying pressure to the back panel of the display screen towards the support plate, wherein the side of the pressure block near the support plate is provided with a relief groove to avoid protruding structures on the back panel of the display screen.

[0024] By adopting the above technical solution, the raised structure on the display screen back panel is avoided by the avoidance groove, so that the pressure block and the display screen back panel do not interfere with each other, and the raised structure on the display screen back panel is prevented from deforming due to the pressure of the pressure block, thus improving the integrity of the display screen back panel during the flattening process.

[0025] Optionally, it also includes a drive source that provides pressure to the pressure block. A sleeve is fixedly connected to the side of the pressure block away from the bearing plate. The sleeve is sleeved on the piston rod of the drive source. The sleeve has a first through hole, and the piston rod of the drive source has a second through hole. The second through hole and the first through hole are coaxially arranged. The sleeve also has a locking pin. The locking pin passes through the first through hole and the second through hole in sequence. Limiting blocks are fixedly connected to both ends of the locking pin. The two limiting blocks abut against both sides of the sleeve.

[0026] By adopting the above technical solution, the structure in which the locking pin passes through the first and second through holes achieves a detachable connection between the pressure block and the driving source. When replacing the display screen back panel that needs to be flattened, the pressure block that is compatible with the replacement display screen back panel can be replaced, improving the versatility of the flattening tooling. On the other hand, the setting of the limiting block prevents the locking pin from detaching from the first and second through holes, improving the stability of the connection between the pressure block and the driving source.

[0027] In summary, this application includes at least one of the following beneficial technical effects:

[0028] 1. Rotating the drive gear drives all the first racks to move synchronously, thereby allowing all the shims to move closer or further away, improving the convenience of adjusting the position of all the shims sliding on the support plate;

[0029] 2. The elongated hole allows the first rack to disengage from the drive gear when the driven gear slides to the side away from the first rack, improving the flexibility of the drive adjustment pad sliding on the support plate.

[0030] 3. Rotate the first locking block to press against the bearing plate, so as to cooperate with the second locking block to lock the sliding of the rotating column, thereby improving the stability of fixing the driven gear in the position of meshing with the driving gear. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the structure of a display screen back panel flattening fixture in Embodiment 1 of this application.

[0032] Figure 2 This is a schematic diagram of the structure of the carrier component in Embodiment 1 of this application.

[0033] Figure 3 This is a schematic diagram of the structure of the adjustment component in Embodiment 1 of this application.

[0034] Figure 4 yes Figure 3 Enlarged schematic diagram of part A in the middle.

[0035] Figure 5 yes Figure 3 Enlarged schematic diagram of section B.

[0036] Figure 6 This is a schematic diagram of the structure of the first pulley and the second pulley in Embodiment 1 of this application.

[0037] Figure 7 This is a schematic diagram of the flattening component in Embodiment 1 of this application.

[0038] Figure 8 yes Figure 7 Enlarged diagram of section C.

[0039] Figure 9 This is a schematic diagram of the limiting post and connecting post in Embodiment 2 of this application.

[0040] Figure 10 This is a schematic diagram of the structure of the adjustment component in Embodiment 2 of this application.

[0041] Explanation of reference numerals in the attached drawings: 1. Base; 12. Pad; 13. Fixing frame; 2. Bearing assembly; 21. Bearing plate; 211. Sliding hole; 212. Long slotted hole; 213. Second rack; 214. Locking rod; 215. Connecting block; 216. Bolt; 217. Limiting post; 2171. Abutting block; 218. Connecting post; 219. Limiting hole; 22. Through post; 23. Elevating block; 3. Adjusting assembly; 31 311. Rotating column; 312. First locking block; 313. Second locking block; 32. First rack; 33. Driven gear; 34. Driven gear; 35. First pulley; 36. Second pulley; 361. Handle; 4. Flattening assembly; 41. Drive source; 412. Second through hole; 42. Pressing block; 423. Clearance groove; 43. Sleeve; 434. First through hole; 435. Locking column; 436. Limiting block. Detailed Implementation

[0042] The following is in conjunction with the appendix Figure 1-10 This application will be described in further detail.

[0043] This application discloses a display screen back panel flattening fixture.

[0044] Example 1

[0045] Reference Figure 1 The display screen back panel flattening fixture includes a base 1, a support assembly 2, an adjustment assembly 3, and a flattening assembly 4. The support assembly 2 is mounted on the base 1 for placing the display screen back panel. The adjustment assembly 3 is mounted on the side of the support assembly 2 near the base 1 to adjust the size of the space used to place the display screen back panel. The flattening assembly 4 is mounted on the side of the base 1 near the support plate 21 to apply pressure to the display screen back panel towards the base 1.

[0046] Reference Figure 1 and Figure 2The supporting component 2 includes a supporting plate 21, through-posts 22, and shims 23. The supporting plate 21 is fixedly connected to the side of the base 1 near the flattening component 4, and has a plurality of sliding holes 211. In this embodiment, taking four sliding holes 211 as an example, the four sliding holes 211 are arranged in pairs along the two diagonals of the supporting plate 21. The number of through-posts 22 is the same as the number of sliding holes 211, and the through-posts 22 are inserted one-to-one and slide within the sliding holes 211. The number of shims 23 is the same as the number of through-posts 22, and the shims 23 are fixedly connected to the end of the through-post 22 away from the base 1. The four shims 23 cooperate with each other to support the back panel of the display screen. When the through-post 22 slides within the sliding holes 211, the four shims 23 move closer or further away from each other as the through-post 22 slides, so as to adjust the size of the area where the back panel of the display screen to be flattened is placed.

[0047] Reference Figure 2 and Figure 3 To synchronously drive the sliding of all the raised blocks 23, the adjusting assembly 3 includes a rotating column 31, a first rack 32, a driven gear 33, a driving gear 34, a first pulley 35, and a second pulley 36. The supporting plate 21 has the same number of elongated holes 212 as the sliding holes 211, each corresponding to the same side of the sliding holes 211, and arranged perpendicular to the sliding direction of the raised blocks 23. The number of rotating columns 31 is the same as the number of elongated holes 212, and each rotating column 31 passes through and slides within an elongated hole 212. A first locking block 311 is threaded to the end of the rotating column 31 away from the base 1, and the first locking block 311 abuts against the side of the supporting plate 21 away from the base 1. A second locking block 312 is also fixedly connected to the rotating column 31. The second locking block 312 abuts against the side of the bearing plate 21 away from the first locking block 311, so as to cooperate with the first locking block 311 to lock the sliding of the rotating column 31.

[0048] Reference Figure 3 and Figure 4The number of first racks 32 is the same as the number of through-posts 22. Each first rack 32 is fixedly connected to one end of each through-post 22, so that the first rack 32 drives the through-post 22 to move synchronously. The number of driven gears 33 is the same as the number of rotating posts 31. Each driven gear 33 is fixedly connected to one end of each rotating post 31 near the first rack 32. When the rotating post 31 slides to the end of the elongated hole 212 near the sliding hole 211, each driven gear 33 meshes with one of the first racks 32, so that when the driven gear 33 is rotated, the first rack 32 is driven by the driven gear 33 and slides. The driving gear 34 is rotatably connected to the side of the support plate 21 near the driven gear 33. When the driven gear 33 slides to the side near the first rack 32, the driving gear 34 meshes with all the driven gears 33, so that when the driving gear 34 is rotated, all the driven gears 33 are driven by the driving gear 34 and rotate synchronously.

[0049] Reference Figure 3 and Figure 5 To lock the rotation of the drive gear 34, a second rack 213 is slidably connected to the side of the support plate 21 closest to the drive gear 34. A locking rod 214 is hinged to the side of the second rack 213 furthest from the drive gear 34, and a connecting block 215 is connected to the end of the locking rod 214 furthest from the second rack 213. A bolt 216 passes through the support plate 21 and is threaded onto the connecting block 215. When the screw drives the connecting block 215 to move closer to the support plate 21, the second rack 213 slides to the side closest to the drive gear 34, and the second rack 213 meshes with the drive gear 34 to lock the drive gear 34.

[0050] Reference Figure 6 The first pulley 35 is fixedly connected to the side of the drive gear 34 near the base 1, so that the first pulley 35 and the drive gear 34 rotate synchronously. A pad 12 is fixedly connected to the side of the base 1 near the drive gear 34 for mounting the second pulley 36. The second pulley 36 is rotatably connected to the side of the pad 12 away from the base 1, so that the first pulley 35 and the second pulley 36 are on the same plane. The first pulley 35 and the second pulley 36 are driven by a belt, so that rotating the second pulley 36 drives the drive gear 34 to rotate. To facilitate driving the second pulley 36 to rotate, a handle 361 is fixedly connected to the side of the second pulley 36 away from the base 1.

[0051] Reference Figure 7 and Figure 8A fixing frame 13 is fixedly connected to the side of the base 1 near the support plate 21 for mounting the flattening assembly 4. The flattening assembly 4 includes a drive source 41 and a pressing block 42. In this embodiment, the drive source 41 is taken as a cylinder drive, but it can also be a hydraulic cylinder drive, an electric cylinder drive, or other drive forms. The drive source 41 is fixedly connected to the side of the fixing frame 13 away from the base 1, and the piston rod of the drive source 41 faces the support plate 21. The pressing block 42 is located between the drive source 41 and the support plate 21. A sleeve 43 is fixedly connected to the side of the pressing block 42 away from the base 1, and the sleeve 43 is sleeved on the piston rod of the drive source 41. The sleeve 43 has a first through hole 431 on both side walls, and the two first through holes 431 are coaxial. The piston rod of the drive source 41 has a second through hole 411 coaxial with the first through hole 431. A locking pin 432 is provided on the sleeve 43, and the locking pin 432 is sequentially inserted into the first through hole 431 and the second through hole 411 to install the sleeve 43 onto the piston rod of the drive source 41. Limiting blocks 433 are fixedly connected to both ends of the locking pin 432, and the two limiting blocks 433 abut against the two sides of the sleeve 43 respectively to prevent the locking pin 432 from disengaging from the first through hole 431 and the second through hole 411. To avoid protruding structures on the back panel of the display screen, the pressure block 42 has an avoidance groove 421 on the side near the support plate 21.

[0052] The implementation principle of Example 1 is as follows: Holding the handle 361 rotates the second pulley 36, driving the first pulley 35 to synchronously rotate the driving gear 34. At this time, the driven gear 33 is driven by the driving gear 34 and rotates in the same direction, thereby driving the first rack 32 to synchronously move the shim block 23 closer to or away from the driving gear 34. When it is necessary to adjust one of the shim blocks 23 individually, rotating the first locking block 311 causes the rotating column 31 to slide into the elongated hole 212, pushing the rotating column 31 to drive the driven gear 33 to slide away from the first rack 32, causing the first rack 32 to disengage. Drive the active gear 34; after adjusting the shim block 23, rotate the bolt 216 to drive the connecting block 215 to move closer to the support plate 21, so that the second rack 213 slides to mesh with the active gear 34 to lock the active gear 34; start the drive source 41 to drive the pressure block 42 to move closer to the support plate 21 to apply pressure to flatten the display screen back panel; when the pressure block 42 needs to be replaced, remove the limiting block 433 at one end of the locking post 432, and then remove the locking post 432 from the other end to separate the sleeve 43 and the piston rod of the drive source 41.

[0053] Example 2

[0054] Reference Figure 9 and Figure 10The difference between this embodiment and Embodiment 1 is that the support plate 21 has limiting posts 217 and connecting posts 218 to lock the sliding of the driven gear 33. The support plate 21 has twice the number of limiting holes 219 as the number of elongated holes 212, with one limiting hole 219 on each side of each elongated hole 212. The number of limiting posts 217 is the same as the number of limiting holes 219, and the limiting posts 217 are correspondingly inserted and slide within the limiting holes 219. The number of connecting posts 218 is the same as the number of elongated holes 212, and the two ends of the connecting posts 218 are respectively fixedly connected to the ends of the limiting posts 217 on both sides of the same elongated hole 212 that are away from the driven gear 33. When the rotating column 31 drives the driven gear 33 to slide to one end of the elongated hole 212 and engage with the first rack 32, the connecting column 218 is moved closer to the support plate 21. At this time, the first locking block 311 abuts against the side of the connecting column 218 closer to the driving gear 34 to prevent the driven gear 33 from disengaging from the first rack 32. In order to prevent the limiting column 217 from disengaging from the limiting hole 219 when it slides within the limiting hole 219, an abutment block 2171 is fixedly connected to the end of the limiting column 217 away from the connecting column 218. When the connecting rod is pulled to the side away from the support plate 21, the abutment block 2171 abuts against the side of the support plate 21 away from the connecting column 218.

[0055] The implementation principle of Example 2 is as follows: Holding the handle 361 rotates the second pulley 36, driving the first pulley 35 to synchronously rotate the driving gear 34. At this time, the driven gear 33 is driven by the driving gear 34 and rotates in the same direction, thereby driving the first rack 32 to synchronously move the shim block 23 closer to or away from the driving gear 34. When it is necessary to adjust one of the shim blocks 23 individually, the connecting column 218 is pulled away from the bearing plate 21, causing the rotating column 31 to slide into the elongated hole 212. This pushes the rotating column 31 to drive the driven gear 33 to slide away from the first rack 32, causing the first rack 32 to move away from the driving gear 34. The rack 32 disengages from the drive of the drive gear 34; after the adjustment of the shim block 23 is completed, the bolt 216 is rotated to drive the connecting block 215 to move closer to the support plate 21, so that the second rack 213 slides to mesh with the drive gear 34 to lock the drive gear 34; the drive source 41 is started to drive the pressure block 42 to move closer to the support plate 21 to apply pressure to flatten the display screen back panel; when the pressure block 42 needs to be replaced, the limiting block 433 at one end of the locking post 432 is removed, and then the locking post 432 is taken out from the other end to separate the sleeve 43 and the piston rod of the drive source 41.

[0056] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A fixture for flattening a display screen back panel, characterized in that: The device includes a base (1) and a support plate (21) for mounting the back panel of the display screen. The support plate (21) is fixedly connected to the base (1). A plurality of shims (23) for placing the back panel of the display screen are slidably connected to the side of the support plate (21) away from the base (1). A first rack (32) is fixedly connected to the end of the shim (23) near the base (1). The first rack (32) is arranged one-to-one with the sliding direction of the shim (23) fixedly connected to it. The first rack (32) is located on the support plate (21) near the base (1). On one side of the base (1), the bearing plate (21) near the first rack (32) is provided with the same number of passive gears (33) as the first rack (32). The passive gears (33) mesh with the first rack (32) one by one. The passive gears (33) are located on the same side of the first rack (32) one by one. The bearing plate (21) near the passive gears (33) is also rotatably connected with a driving gear (34). The driving gear (34) meshes with all the passive gears (33).

2. The display screen back panel flattening fixture according to claim 1, characterized in that: The support plate (21) is provided with an equal number of elongated holes (212) as the passive gears (33). The elongated holes (212) are arranged along the length direction perpendicular to the first rack (32). A rotating column (31) is provided on the passive gear (33). The rotating column (31) passes through and slides in the elongated holes (212). A first locking block (311) is provided on the side of the rotating column (31) away from the passive gear (33). The first locking block (311) abuts against the side of the support plate (21) away from the passive gear (33). When the passive gear (33) slides to the side away from the first rack (32), the passive gear (33) and the first rack (32) separate, and the first rack (32) disengages from the drive of the driving gear (34).

3. The display screen back panel flattening fixture according to claim 2, characterized in that: A second locking block (312) is fixedly connected to the rotating column (31). The second locking block (312) abuts against the side of the bearing plate (21) near the driven gear (33). The first locking block (311) is threadedly connected to the side of the rotating column (31) away from the driven gear (33).

4. The display screen back panel flattening fixture according to claim 2, characterized in that: The support plate (21) is provided with a number of limiting holes (219) that is twice the number of the long waist holes (212). Each long waist hole (212) has a limiting hole (219) on both sides. The support plate (21) is provided with a number of limiting posts (217) that are the same as the number of limiting holes (219). The limiting posts (217) are inserted one by one and slide in the limiting holes (219). The support plate (21) is provided with a number of connecting posts (218) that are the same as the number of long waist holes (212) on the side away from the driven gear (33). The two ends of the same connecting post (218) are respectively fixedly connected to the ends of the limiting posts (217) on both sides of the same long waist hole (212). When the first locking block (311) abuts against the side of the connecting post (218) near the driving gear (34), the driven gear (33) and the driving gear (34) mesh.

5. The display screen back panel flattening fixture according to claim 4, characterized in that: The end of the limiting post (217) away from the connecting post (218) is fixedly connected to an abutment block (2171). When the connecting post (218) drives the limiting post (217) to move away from the base (1) so that the first locking block (311) can slide, the abutment block (2171) abuts against the side of the bearing plate (21) near the base (1).

6. The display screen back panel flattening fixture according to claim 1, characterized in that: The support plate (21) is slidably connected to a second rack (213) on the side near the drive gear (34). A locking rod (214) is hinged to the side of the second rack (213) away from the drive gear (34). A connecting block (215) is hinged to the end of the locking rod (214) away from the second rack (213). A bolt (216) is provided on the support plate (21). The bolt (216) passes through the support plate (21) and is threaded onto the connecting block (215).

7. The display screen back panel flattening fixture according to claim 1, characterized in that: The first pulley (35) is fixedly connected to the side of the drive gear (34) away from the support plate (21). The first pulley (35) and the drive gear (34) are coaxially arranged. The base (1) extends to the outside of the support plate (21). The second pulley (36) is rotatably connected to the side of the base (1) extending to the outside of the support plate (21). The first pulley (35) and the second pulley (36) are driven by a belt.

8. The display screen back panel flattening fixture according to claim 7, characterized in that: A handle (361) is fixedly connected to the side of the second pulley (36) away from the base (1).

9. The display screen back panel flattening fixture according to claim 1, characterized in that: It also includes a pressure block (42) for applying pressure to the back panel of the display screen towards the side of the support plate (21), the pressure block (42) having a relief groove (421) on the side near the support plate (21) to avoid protruding structures on the back panel of the display screen.

10. A display screen back panel flattening fixture according to claim 9, characterized in that: It also includes a drive source (41) that provides pressure to the pressure block (42). A sleeve (43) is fixedly connected to the side of the pressure block (42) away from the bearing plate (21). The sleeve (43) is sleeved on the piston rod of the drive source (41). The sleeve (43) is provided with a first through hole (431). The piston rod of the drive source (41) is provided with a second through hole (411). The second through hole (411) and the first through hole (431) are coaxially arranged. The sleeve (43) is also provided with a locking pin (432). The locking pin (432) is sequentially inserted into the first through hole (431) and the second through hole (411). Both ends of the locking pin (432) are fixedly connected with limit blocks (433). The two limit blocks (433) abut against the two sides of the sleeve (43).

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