Die for producing rear plate

Abstract

The utility model relates to the technical field of dies, and discloses a die for producing a rear plate, the die comprises a base, an upper die, a lower die and a driving assembly are arranged on the base, the upper die and the lower die are oppositely arranged, the upper die comprises a to-be-machined structure and a front machining structure, the to-be-machined structure comprises a hole dotting assembly and a hole punching assembly, and the front machining structure comprises a hole dotting assembly and a hole punching assembly; the front machining structure comprises a shearing assembly and a bending assembly, and the shearing assembly is located on the side, close to the punching assembly, of the bending assembly. When the to-be-machined structure machines the metal plate, the area, obtained after machining of the to-be-machined structure, in the metal plate is machined through the front machining structure, so that the to-be-machined structure and the front machining structure do not interfere with each other; the four procedures can be carried out simultaneously, so that the processing time for producing each rear plate is shortened, and the production efficiency of a manufacturer is improved; four procedures can be achieved through one mold, so that the occupied space needed by an assembly line is reduced, and more space and production cost are saved for manufacturers.

Description

Technical Field

[0001] This application relates to the technical field of molds, and in particular to a mold for producing a back plate. Background Technology

[0002] Molds are important tools used in modern industrial production to create shaped products. Their main function is to process raw materials into products with specific shapes and sizes through external force. The back panel of the distribution cabinet is a component of the drawer in the distribution cabinet. The production process of the back panel requires cutting, punching and bending processes in sequence, and each process requires a corresponding mold.

[0003] In related technologies, the mold includes a base, on which an upper mold, a lower mold, and a drive assembly are provided. The upper mold and the lower mold are arranged opposite to each other, and the drive assembly is used to drive the upper mold to close in a direction closer to the lower mold.

[0004] Since each process requires a corresponding mold, the metal sheet needs to be processed by cutting mold, punching mold and bending mold in sequence during the production process. Therefore, the production line needs a large space and many steps and time to make a single sheet. Utility Model Content

[0005] In order to improve the production of back panels, which requires multiple molds for corresponding processes, this application provides a mold for producing back panels.

[0006] This application provides a mold for producing a back plate, which adopts the following technical solution:

[0007] A mold for producing a back plate includes a base, on which an upper mold, a lower mold, and a driving assembly are mounted. The upper and lower molds are arranged opposite to each other. The driving assembly drives the upper mold to close towards the lower mold. The upper mold includes a structure to be processed and a processing structure. The structure to be processed includes a dotting assembly and a punching assembly. The dotting assembly is used to create multiple through holes, and the punching assembly is used to punch holes in a metal plate. The processing structure includes a shearing assembly and a bending assembly. The shearing assembly is used to shear the metal plate at the through holes, and the bending assembly is used to bend the metal plate. The shearing assembly is located on the side of the bending assembly closer to the punching assembly. When the shearing assembly shears the metal plate, the bending assembly does not contact the metal plate. When the structure to be processed processes the metal plate, the processing structure processes the area of ​​the metal plate after the structure to be processed has been processed.

[0008] By adopting the above technical solution, when the metal plate enters the processing area of ​​the structure to be processed, the structure to be processed performs spot drilling and punching on the metal plate. The spot drilling assembly opens a row of through holes on the metal plate to facilitate the subsequent shearing assembly to shear the row of through holes. The metal plate processed by the structure to be processed continues to move to the processing area of ​​the main processing structure, where the main processing structure shears and bends the metal plate. When the shearing assembly shears the metal plate, the shearing assembly is located on the side of the bending assembly closer to the punching assembly. The shearing assembly is used to shear the metal plate at the through holes, and the bending assembly does not abut against the metal plate. This allows the metal sheet to be cut to the appropriate size before bending, reducing the possibility of the metal sheet bending around the edges during bending and affecting the cutting position. When the structure to be processed is processing the metal sheet, the processing structure processes the area of ​​the metal sheet that has been processed by the structure to be processed, so that the structure to be processed and the processing structure do not interfere with each other. The four processes can be carried out simultaneously, thereby shortening the processing time for each back plate and improving the manufacturer's production efficiency. The four processes can be realized with a single mold, which reduces the space required for the production line, saving the manufacturer more space and production costs.

[0009] Optionally, the punching assembly has a groove, and a punching block is slidably connected in the groove. The punching block is used to punch holes in the metal plate. The punching block has a fixing hole. Multiple limiting holes are provided on the groove wall away from the positive machining structure. The upper die has a fixing strip. The length of the fixing strip is greater than the length of the limiting hole and the length of the fixing strip is greater than the length of the fixing hole. The fixing strip can be inserted into the limiting hole and the fixing hole in sequence.

[0010] By adopting the above technical solution, the punch block is slidably connected in the groove, allowing the punch block to change position. The manufacturer can adjust the position of the punch without changing the mold, enabling the same mold to fit more back plates, thus providing convenience for the manufacturer and reducing the cost of changing the mold. The fixing strip can be inserted into the limiting hole and the fixing hole in sequence. The length of the fixing strip is greater than the length of the limiting hole, so that the two ends of the fixing strip can be located in the limiting hole and the fixing hole respectively, thereby fixing the punch block in the groove.

[0011] Optionally, a baffle is rotatably connected to the surface of the upper mold where a limiting hole is formed, and the baffle is used to block the limiting hole.

[0012] By adopting the above technical solution, when the mold is being processed, the fixing strip will be vibrated and displaced. A baffle is rotatably connected to the surface of the upper mold with a limit hole, and the baffle is used to block the limit hole, so that the baffle can prevent the fixing strip from falling out of the limit hole, thereby strengthening the stability of the fixing strip fixing the punch block.

[0013] Optionally, the groove wall is provided with a plurality of protrusions, the protrusions are elastic, and the plurality of protrusions are all located on the moving path of the punch block. When the punch block abuts against different protrusions, the fixing hole and the corresponding limiting hole are aligned.

[0014] By adopting the above technical solution, when people install the punch block, the protrusions are elastic and multiple protrusions are located on the moving path of the punch block. The punch block abuts against the protrusions, allowing people to sense that the punch block has moved to the appropriate position, that is, the fixing hole and the limiting hole are aligned. This allows people to directly insert the fixing strip into the fixing hole and the limiting hole without having to observe whether the fixing hole and the limiting hole are aligned, thereby shortening the time for people to install the punch block and making the installation of the punch block more convenient.

[0015] Optionally, the fixing strip is provided with a pull rope, and the baffle is provided with a receiving hole for the pull rope to pass through; when the baffle blocks the limiting hole, the pull rope passes through the receiving hole.

[0016] By adopting the above technical solution, when the baffle blocks the limiting hole, the pull rope passes through the receiving hole, making it easier for people to find the limiting hole into which the fixing strip is inserted, thereby determining the position of the punch block and directly knowing the model of the back plate being produced; when the baffle does not block the limiting hole, the fixing strip is equipped with a pull rope, which allows people to pull the fixing strip out of the limiting hole, making the removal of the fixing strip more convenient.

[0017] Optionally, the pull rope is provided with a limiting block that can move in the receiving hole. The receiving hole has a receiving groove on its wall, and an iron sheet is provided in the receiving groove. The limiting block is provided with a magnet. When the magnet attracts the iron sheet, the limiting block abuts against the groove wall of the receiving groove near the iron sheet, and the limiting block abuts against the groove wall of the receiving groove near the machining structure, and the pull rope is in a taut state.

[0018] By adopting the above technical solution, when the magnet attracts the iron sheet, the two surfaces of the limiting block abut against the wall of the receiving groove containing the iron sheet and the wall of the receiving groove near the positive machining structure, respectively, so that the limiting block can be fixed in the receiving groove, and the pull rope is in a taut state, so that the baffle will not be displaced by the vibration of the mold, reducing the possibility of the baffle moving away from the limiting hole.

[0019] Optionally, a spring is provided in the receiving hole, and a fixing block is provided on the spring. The spring is used to drive the fixing block to be located on the moving path of the limiting block. When the two surfaces of the limiting block abut against the fixing block and the receiving groove respectively and move away from the groove wall of the spring, the spring is in a compressed state.

[0020] By adopting the above technical solution, the spring is used to drive the fixed block to be located on the moving path of the limiting block. The fixed block can limit the movement of the limiting plate by the driving of the spring. When the two surfaces of the limiting block abut against the fixed block and the receiving groove away from the groove wall of the spring, the spring is in a compressed state. The spring will exert a force on the limiting block, so that the two surfaces of the limiting block abut against the fixed block and the receiving groove away from the spring more firmly, thereby better limiting the movement of the limiting block.

[0021] Optionally, the baffle has a receiving hole, and a retaining strip is slidably connected in the receiving hole. The length of the retaining strip is greater than the length of the receiving hole. When the baffle is in an inclined state, the retaining strip can abut against the fixing strip.

[0022] By adopting the above technical solution, when the fixing strip is not fully inserted into the limiting hole and the baffle abuts against the fixing strip, the baffle is in an inclined state. At this time, the space between the baffle and the fixing strip is small, and it is not easy for people to directly push the fixing strip through the space. A retaining strip is slidably connected in the receiving hole. The length of the retaining strip is greater than the length of the receiving hole, so that part of the retaining strip extends out of the receiving hole. Thus, people can directly push the retaining strip on the surface of the baffle away from the limiting hole. The retaining strip can abut against the fixing strip, so people can press the fixing strip to push it completely into the limiting hole. This avoids the situation where people need to press the baffle hard to press the fixing strip into the limiting hole, thereby reducing the damage caused by the baffle squeezing the fixing strip and providing convenience for people to insert the fixing strip.

[0023] In summary, this application includes at least one of the following beneficial technical effects:

[0024] 1. When the metal sheet enters the processing area of ​​the structure to be processed, the structure punches and punctures holes in the metal sheet. The punching assembly creates a row of through holes in the metal sheet to facilitate the subsequent shearing assembly's cutting of these through holes. After processing, the metal sheet continues to move to the processing area of ​​the main processing structure, where it is sheared and bent. When the shearing assembly cuts the metal sheet, it is positioned on the side of the bending assembly closest to the punching assembly. The shearing assembly cuts the metal sheet at the through holes, and the bending assembly does not contact the metal sheet, allowing the metal to... The sheet metal can be pre-cut to the appropriate size before bending, reducing the possibility of the sheet metal bending around the edges during bending and affecting the cutting position. When the structure to be processed is processing the sheet metal, the processing structure processes the area of ​​the sheet metal after the structure to be processed has been processed, so that the structure to be processed and the processing structure do not interfere with each other. The four processes can be carried out simultaneously, thereby shortening the processing time for each sheet and improving the manufacturer's production efficiency. All four processes can be achieved with a single mold, reducing the space required for the production line and saving the manufacturer more space and production costs.

[0025] When installing the punch block, the protrusions are elastic, and multiple protrusions are located on the moving path of the punch block. The punch block abuts against the protrusions, allowing people to sense that the punch block has moved to the appropriate position, that is, the fixing hole and the limiting hole are aligned. This allows people to directly insert the fixing strip into the fixing hole and the limiting hole without having to observe whether the fixing hole and the limiting hole are aligned, thus shortening the installation time of the punch block and making the installation of the punch block more convenient. Attached Figure Description

[0026] Figure 1 This is a structural schematic diagram of Example 1;

[0027] Figure 2 This is a schematic diagram of the upper mold structure in Example 2;

[0028] Figure 3 It is along the edge of Example 2 Figure 2 A partial sectional view of line AA in the middle;

[0029] Figure 4 It is Example 2 Figure 3 Enlarged schematic diagram of part B;

[0030] Figure 5 This is a schematic diagram of the prominent card strip structure in Example 2;

[0031] Figure 6 It is along the edge of Example 2 Figure 5 A partial sectional view of the CC line.

[0032] Reference numerals: 1. Base; 2. Upper mold; 21. Groove; 211. Limiting hole; 212. Slot; 22. Fixing strip; 221. Pull rope; 222. Limiting block; 23. Protrusion; 24. Rotating shaft; 3. Baffle; 31. Receiving hole; 32. Receiving groove; 33. Placement hole; 34. First placement groove; 341. Iron sheet; 35. Second placement groove; 351. Magnet; 36. Fixing groove; 361. Spring; 362. Fixing block; 363. Inclined surface; 37. Receiving hole; 371. Locking strip; 4. Structure to be processed; 41. Point hole assembly; 411. Point hole block; 42. Punching assembly; 421. Punching block; 422. Fixing hole; 5. Forward processing structure; 51. Shearing assembly; 511. Shearing part; 52. Bending assembly; 6. Lower mold; 7. Drive assembly. Detailed Implementation

[0033] The following is in conjunction with the appendix Figures 1-6 This application will be described in further detail.

[0034] Example 1

[0035] This embodiment discloses a mold for producing a back plate. (Refer to...) Figure 1A mold for producing a back plate includes a base 1, on which an upper mold 2, a lower mold 6, and a drive assembly 7 are fixedly connected. The upper mold 2 and the lower mold 6 are arranged opposite to each other, with the upper mold 2 located directly above the lower mold 6. The drive assembly 7 is used to drive the upper mold 2 to close in a direction closer to the lower mold 6.

[0036] Reference Figure 1 The upper mold 2 has a structure to be processed 4 and a processing structure 5. The metal plate first moves to the area directly below the structure to be processed 4, and waits for the structure to be processed 4 to complete its processing of the metal plate. Then, it moves to the area directly below the processing structure 5, and waits for the processing structure 5 to complete its processing of the metal plate. While the structure to be processed 4 is processing the metal plate, the processing structure 5 processes the area in the metal plate that has been processed by the structure to be processed 4.

[0037] Reference Figure 1 The structure to be processed 4 includes a hole-punching assembly 41 and a punching assembly 42. The hole-punching assembly 41 includes multiple hole-punching blocks 411, which are disposed on the upper die 2 and arranged in an array along the width direction of the upper die 2. The hole-punching blocks 411 are used to punch a row of through holes in the metal plate. The punching assembly 42 is provided with punching blocks 421, which are used to punch holes in the metal plate.

[0038] Reference Figure 1 The machining structure 5 includes a shearing assembly 51 and a bending assembly 52. ​​The punching assembly 41, punching assembly 42, shearing assembly 51, and bending assembly 52 are sequentially arranged on the upper die 2 along the metal plate moving direction. The shearing assembly 51 includes a shearing piece 511, which is fixedly connected to the upper die 2. The shearing piece 511 is used to shear the metal plate between the through holes in the same row, cutting the metal plate to the required size. The bending assembly 52 is used to bend the metal plate around its perimeter. The height of the shearing assembly 51 from the ground is less than the height of the bending assembly 52 from the ground. When the shearing assembly 51 shears the metal plate, the bending assembly 52 does not contact the metal plate.

[0039] The implementation principle of Example 1 is as follows: When the metal plate enters the processing area of ​​the structure to be processed 4, the dotting assembly 41 and the punching assembly 42 simultaneously dot and punch holes in the metal plate. The area processed by the structure to be processed 4 moves to the processing area of ​​the processing structure 5. The shearing assembly 51 first abuts against the metal plate and shears the through holes. Then the bending assembly 52 bends the sheared metal plate around its perimeter, and the back plate is completed.

[0040] Example 2

[0041] Reference Figure 2The difference between this embodiment and embodiment 1 is that the punching assembly 42 includes a plurality of punching blocks 421, and the upper die 2 has a groove 21 that extends along the width direction of the upper die 2. The punching blocks 421 are slidably connected in the groove 21.

[0042] Reference Figure 2 and Figure 3 A fixing hole 422 is formed on the surface of the punch block 421 near the machining structure 5. Four limiting holes 211 are formed on the groove wall of the groove 21 away from the machining structure 5, and the four limiting holes 211 are arranged in an array along the width direction of the upper die 2. Four slots 212 are formed on the groove wall of the groove 21 near the machining structure 5, and the slots 212 extend along the length direction of the limiting holes 211, with each slot 212 aligned with its corresponding limiting hole 211. A fixing strip 22 is detachably connected to the upper die 2. The fixing strip 22 can be inserted sequentially into the limiting holes 211, fixing holes 422, and slots 212, and the length of the fixing strip 22 is equal to the total length of the limiting holes 211, fixing holes 422, and slots 212. The fixing strip 22 is used to fix the punch block 421.

[0043] Reference Figure 2 and Figure 3 Four protrusions 23 are fixedly connected to the groove wall of the groove 21 near the limiting hole 211. The protrusions 23 are elastic, and all four protrusions 23 are located on the moving path of the punch block 421. When the punch block 421 abuts against different protrusions 23, the fixing hole 422 and the corresponding limiting hole 211 are aligned.

[0044] Reference Figure 3 A rotating shaft 24 is rotatably connected to the surface of the upper mold 2 with limit holes 211. A baffle 3 is fixedly connected to the rotating shaft 24 and is used to block the four limit holes 211.

[0045] Reference Figure 3 and Figure 4 One end of the fixing strip 22 is fixedly connected to a pull rope 221, and a limit block 222 is fixedly connected to the pull rope 221. The pull rope 221 passes through the limit block 222, and the pull rope 221 is located on both sides of the limit block 222. A receiving hole 31 is provided on the surface of the baffle 3 that abuts against the upper mold 2. The receiving hole 31 is used for the pull rope 221 and the limit block 222 to pass through.

[0046] Reference Figure 3 and Figure 4 When the baffle 3 blocks the limiting hole 211, a receiving groove 32 is formed on the hole wall of the receiving hole 31 away from the ground, and the receiving groove 32 extends in a direction away from the structure to be processed 4. A placement hole 33 is formed on the groove wall of the receiving groove 32 near the structure to be processed 4, and the placement hole 33 extends to the hole wall of the receiving hole 31 away from the ground, and extends in a direction away from the upper mold 2, and the placement hole 33 is used for the pull rope 221 to pass through.

[0047] Reference Figure 3 and Figure 4 A first placement groove 34 is formed on the bottom wall of the receiving groove 32, and an iron sheet 341 is fixedly connected in the first placement groove 34. A second placement groove 35 is formed on the limiting block 222, and a magnet 351 is fixedly connected in the second placement groove 35. When the magnet 351 attracts the iron sheet 341, the limiting block 222 abuts against the groove wall of the receiving groove 32 near the iron sheet 341, and the limiting block 222 abuts against the groove wall of the receiving groove 32 near the structure 4 to be processed. The pull rope 221 is located in the placement hole 33 and is in a taut state.

[0048] Reference Figure 3 and Figure 4 A fixing groove 36 is provided on the wall of the receiving hole 31 near the ground. A spring 361 is fixedly connected to the bottom wall of the fixing groove 36, and a fixing block 362 is fixedly connected to the spring 361. An inclined surface 363 is provided on the surface of the fixing block 362 near the structure to be processed 4. When the baffle 3 blocks the limiting hole 211, the height of the inclined surface 363 from the ground gradually decreases along the direction of the fixing block 362 near the structure to be processed 4. The inclined surface 363 is located on the moving path of the limiting block 222 inserted into the receiving hole 31.

[0049] Reference Figure 3 and Figure 4 When the two surfaces of the limiting block 222 abut against the fixing block 362 and the receiving groove 32 respectively, away from the groove wall of the spring 361, the pull rope 221 is in a taut state and the spring 361 is in a compressed state, at which time the limiting block 222 is in the locked position; when the limiting hole 211 is in the receiving hole 31 and does not abut against the fixing block 362, the spring 361 is in a non-forced state, the fixing block 362 is on the moving path of the limiting block 222 inserting into the receiving hole 31, and the pull rope 221 is in a taut state, at which time the limiting block 222 is in the designated position.

[0050] Reference Figure 5 Four receiving holes 37 are provided on the surface of the baffle 3 away from the structure 4 to be processed. The four receiving holes 37 are respectively located on the side of the corresponding receiving hole 31 near the rotating shaft 24. A retaining strip 371 is slidably connected in the receiving hole 37. The retaining strip 371 is always located in the receiving hole 37, and the length of the retaining strip 371 is greater than the length of the receiving hole 37.

[0051] Reference Figure 5 and Figure 6When the fixing strip 22 is not fully inserted into the limiting hole 211 and the baffle 3 abuts against the fixing strip 22, the receiving hole 37 is connected to the corresponding limiting hole 211. At this time, it is difficult for the user to reach into the space between the baffle 3 and the fixing strip 22 with his hand. The user pushes the fixing strip 22 with the locking strip 371 so that the fixing strip 22 is fully inserted into the upper mold 2, thereby fixing the fixing strip 22 to the punching block 421.

[0052] Reference Figure 6 When the baffle 3 blocks the limiting hole 211, the distance from the receiving hole 37 to the receiving hole 31 decreases along the direction of the baffle 3 towards the upper mold 2, and the receiving hole 37 and the receiving hole 31 are not connected, while the receiving hole 37 and the limiting hole 211 are connected, so as to enable the card strip 371 to drive the fixing strip 22 to be fully inserted into the limiting hole 211.

[0053] The implementation principle of Example 2 is as follows: When the user installs the punch block 421, the user moves the fixing block 362 in the groove 21 until it abuts against the appropriate protrusion 23. At this time, the two sides of the fixing hole 422 are aligned with the limiting hole 211 and the slot 212 respectively. The user inserts the fixing strip 22 into the limiting slot and lets the pull rope 221 and the limiting block 222 pass through the receiving hole 31, so that the pull rope 221 and the limiting block 222 move to the designated position. Then, by pressing the corresponding slot strip 371, the fixing strip 22 is completely inserted into the limiting hole 211, and the fixing strip 22 abuts against the bottom wall of the slot 212. Then the user pulls the pull rope 221, so that the limiting block 222 moves along the inclined surface 363 to between the fixing block 362 and the slot wall of the receiving slot 32 away from the spring 361. At this time, the pull rope 221 is in a taut state, the spring 361 is in a compressed state, and the magnet 351 is attracted to the iron sheet 341, so that the limiting block 222 is fixed in the limiting slot.

[0054] Unless otherwise defined, the technical or scientific terms used in this application shall have the ordinary meaning understood by one of ordinary skill in the art to which this application pertains. The terms "first," "second," "third," and similar terms used in this application specification and claims do not indicate any order, quantity, or importance, but are merely used to distinguish different components. The terms "an" or "a" and similar terms do not indicate a quantity limitation, but rather indicate the presence of at least one. The terms "comprising" or "including" and similar terms mean that the elements or objects preceding "comprising" or "including" encompass the elements or objects listed following "comprising" or "including" and their equivalents, and do not exclude other elements or objects. "Above," "below," "left," "right," etc., are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0055] The above description is only a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, improvements, etc., made within the design concept of this application should be included within the protection scope of this application.

Claims

1. A mold for producing a back plate, comprising a base (1), wherein an upper mold (2), a lower mold (6), and a driving assembly (7) are provided on the base (1), the upper mold (2) and the lower mold (6) being disposed opposite to each other, and the driving assembly (7) being used to drive the upper mold (2) to close in a direction closer to the lower mold (6), characterized in that: The upper mold (2) includes a structure to be processed (4) and a processing structure (5). The structure to be processed (4) includes a hole-punching assembly (41) and a punching assembly (42). The hole-punching assembly (41) is used to open multiple through holes, and the punching assembly (42) is used to punch holes in the metal plate. The processing structure (5) includes a shearing assembly (51) and a bending assembly (52). The shearing assembly (51) is used to shear the metal plate at the through holes, and the bending assembly (52) is used to bend the metal plate. The shearing assembly (51) is located on the side of the bending assembly (52) close to the punching assembly (42). When the shearing assembly (51) shears the metal plate, the bending assembly (52) does not abut against the metal plate. When the structure to be processed (4) processes the metal plate, the processing structure (5) processes the area of ​​the metal plate after the structure to be processed (4) has been processed.

2. The mold for producing a back plate according to claim 1, characterized in that: The punching assembly (42) has a groove (21) and a punching block (421) is slidably connected in the groove (21). The punching block (421) is used to punch the metal plate. The punching block (421) has a fixing hole (422). The groove wall away from the positive machining structure (5) of the groove (21) has multiple limiting holes (211). The upper die (2) has a fixing strip (22). The length of the fixing strip (22) is greater than the length of the limiting hole (211) and the length of the fixing strip (22) is greater than the length of the fixing hole (422). The fixing strip (22) can be inserted into the limiting hole (211) and the fixing hole (422) in sequence.

3. A mold for producing a back plate according to claim 2, characterized in that: A baffle (3) is rotatably connected to the surface of the upper mold (2) having a limiting hole (211), and the baffle (3) is used to block the limiting hole (211).

4. A mold for producing a back plate according to claim 2, characterized in that: The groove (21) has multiple protrusions (23) on its groove wall. The protrusions (23) are elastic. The multiple protrusions (23) are all located on the moving path of the punch block (421). When the punch block (421) abuts against different protrusions (23), the fixing hole (422) and the corresponding limiting hole (211) are aligned.

5. A mold for producing a back plate according to claim 3, characterized in that: The fixing bar (22) is provided with a pull rope (221), and the baffle (3) is provided with a receiving hole (31). The receiving hole (31) is used for the pull rope (221) to pass through. When the baffle (3) blocks the limiting hole (211), the pull rope (221) passes through the receiving hole (31).

6. A mold for producing a back plate according to claim 5, characterized in that: The pull rope (221) is provided with a limiting block (222), which can move in the receiving hole (31). The receiving hole (31) has a receiving groove (32) on its wall, and an iron piece (341) is provided on the receiving groove (32). The limiting block (222) is provided with a magnet (351). When the magnet (351) attracts the iron piece (341), the limiting block (222) abuts against the groove wall of the receiving groove (32) close to the iron piece (341), and the limiting block (222) abuts against the groove wall of the receiving groove (32) close to the groove wall of the positive machining structure (5), and the pull rope (221) is in a taut state.

7. A mold for producing a back plate according to claim 6, characterized in that: A spring (361) is provided inside the receiving hole (31), and a fixing block (362) is provided on the spring (361). The spring (361) is used to drive the fixing block (362) to be located on the moving path of the limiting block (222). When the two surfaces of the limiting block (222) abut against the fixing block (362) and the receiving groove (32) respectively and move away from the groove wall of the spring (361), the spring (361) is in a compressed state.

8. A mold for producing a back plate according to claim 5, characterized in that: The baffle (3) has a receiving hole (37), and a retaining strip (371) is slidably connected in the receiving hole (37). The length of the retaining strip (371) is greater than the length of the receiving hole (37). When the baffle (3) is in an inclined state, the retaining strip (371) can abut against the fixing strip (22).

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