A luggage plastic support injection molding mold

Abstract

The present application relates to a kind of luggage plastic support injection molding mold, including upper die body and lower die body, the upper die body includes fixed die plate, upper fixed plate, the fixed die plate is equipped with cavity;The lower die body includes movable die plate, the movable die plate is equipped with core;First sliding slot is set on the cavity, the fixed die plate is fixed with mounting plate, the first sliding slot is slidably provided with the forming block for forming support plate in;Limiting post is rotatably arranged on the forming block, the core is equipped with the insertion hole for the limiting post insertion, the sidewall of the insertion hole is equipped with cooperation rod, vertical slot is opened on the outer wall of the limiting post, horizontal slot is opened on the groove wall of the vertical slot, the forming block is equipped with control mechanism for controlling the rotation of limiting post.The present application improves the demoulding structure of mould, prevents the adhesion of prism to the forming block of mould when mould opens, reduces the probability of fracture at the connection of prism and support plate when mould opens.

Description

Technical Field

[0001] This invention relates to the field of molds, and in particular to an injection mold for a plastic luggage bracket. Background Technology

[0002] A type of plastic luggage rack, such as Figure 1 and Figure 2 As shown, the bracket includes a support body 7, and a positioning hole 71 is provided on the side wall of the support body 7. A support plate 72 is provided in the middle of the support body 7, and a polygonal prism 73 is provided on the support plate 72.

[0003] The support body 7 is injection molded using a plastic mold. After the polygonal prism 73 is formed in the mold, multiple faces of it adhere to the molding block of the front mold, while the support body 7 and the support plate 72 adhere to the molding area of ​​the rear mold. Due to the multifaceted nature of the polygonal prism 73, the adhesion between the polygonal prism 73 and the molding block on the front mold is relatively strong. This makes it easy for the polygonal prism 73 to stick to the front mold when the mold is opened, causing the polygonal prism 73 to break and separate from the support plate 72, rendering the injection-molded product unusable. Summary of the Invention

[0004] This application provides an injection molding mold for a plastic luggage bracket. By improving the mold release structure, it prevents the polyhedron from sticking to the molding block of the mold when the mold is opened, and reduces the probability of breakage at the connection between the polyhedron and the support plate when the mold is opened.

[0005] The technical solution for the injection molding die for a plastic luggage bracket provided in this application is as follows: A plastic luggage bracket injection mold includes an upper mold body and a lower mold body. The upper mold body includes a fixed template and an upper fixing plate, and the fixed template has a cavity. The lower mold body includes a movable template, and the movable template has a core. A core-pulling rod is slidably provided on the core along the mold opening direction perpendicular to the mold. The core-pulling rod is used to form positioning holes. The core is provided with a driving mechanism for driving the core-pulling rod to slide. The cavity is provided with a first sliding groove, and the fixed template is fixed with an installation plate. The installation plate blocks the groove of the first sliding groove near the upper fixed plate. A forming block for forming a support plate is slidably arranged in the first sliding groove. The upper fixed plate is provided with a movable groove, and a first bolt is arranged in the movable groove. The thread of the first bolt passes through the installation plate and is connected to the forming block. The molding block is provided with a first chamber for molding a polygonal prism. The mounting plate is provided with a molding rod that extends into the molding block and slides with it. The end of the molding rod away from the mounting plate is provided with a second chamber for molding a polygonal prism. When the mold is in the closed state, the lower mold body presses the molding block against the mounting plate. The molding rod is completely located inside the molding block. The first chamber and the second chamber are connected to form a contour cavity for molding a polygonal prism. The molding block is rotatably provided with a limiting post, the core is provided with an insertion hole for the limiting post to be inserted, the side wall of the insertion hole is provided with a matching rod, the axis of the matching rod is perpendicular to and intersects the axis of the limiting post, the outer wall of the limiting post is provided with a vertical groove, the groove wall of the vertical groove is provided with a horizontal groove, and the molding block is provided with a control mechanism for controlling the rotation of the limiting post. During the mold closing process, the limiting post is inserted into the insertion hole, and the mating rod is inserted into the vertical groove. When the moving template moves to the point of contact with the forming block, the mating rod moves to face the horizontal groove. During the process of the forming block being pushed into the first sliding groove, the control mechanism drives the limiting post to rotate so that the mating rod moves into the horizontal groove. During the mold opening process, the mating rod pulls the limiting post, the forming block, and the first bolt to move with the lower mold body. The polygonal prism moves away from the cavity and disengages from the forming rod along with the moving template. During the process of the mating rod pulling the limiting post, the control mechanism controls the limiting post to rotate so that the mating rod moves synchronously into the vertical groove. As the mold opens, the mating rod slides out of the vertical groove along the mold opening direction, and the support plate and polygonal prism move with the moving template and disengage from the forming block.

[0006] By adopting the above technical solution, during the mold closing process, the injection molding machine controls the lower mold body to move closer to the upper mold body. In this process, firstly, the limiting post moves and inserts into the slot, and the mating rod inserts into the vertical slot. When the moving platen moves to contact the limiting post and the molding block, the mating rod moves to face the horizontal slot, and simultaneously, the mating rod will not continue to slide within the vertical slot. Subsequently, the moving platen continues to move closer to the fixed platen and pushes the molding block into the first slide groove, causing the first spring to be compressed and the molding rod to move into the molding block. During the process of the molding block being pushed into the first slide groove, the control mechanism drives the limiting post to rotate, causing the mating rod to move into the horizontal slot, preparing for the subsequent pulling of the limiting post and the molding block during mold opening. After the mold is fully closed, the moving platen presses the molding block against the mounting plate, connecting cavity one and cavity two. After the mold is fully closed, the injection molding machine injects hot melt plastic between the core and the cavity, simultaneously filling cavity one and cavity two. After the hot melt plastic cools and solidifies, the injection molding of the bracket body is completed.

[0007] As the mold opens and the lower mold body moves away from the upper mold body, and the moving mold plate moves away from the fixed mold plate, the control mechanism drives the limiting post to rotate, causing the mating rod to move towards the vertical groove. During this movement, the mating rod pulls the limiting post and the molding block to follow the moving mold plate, causing the molding block to slide out of the first groove and press the support plate and polygonal prism against the moving mold plate. As the polygonal prism moves away from the upper mold body along with the moving mold plate, it detaches from the molding rod, thus releasing the adhesion between the polygonal prism and the molding rod. Later, when the mating rod moves into the vertical groove, it no longer pulls the limiting post and the molding block to follow the moving mold plate. The mating rod then slides out of the vertical groove along the mold opening direction, and the support plate and polygonal prism move with the moving mold plate and detach from the molding block.

[0008] When the mold is opened, the cooperation between the mating rod and the limiting post allows the polygonal prism to separate from the forming rod and the forming block one after the other. Compared with the traditional single demolding structure, the two-stage demolding design disperses the adhesive force that needs to be overcome when the polygonal prism is demolded, so that the connection between the polygonal prism and the support plate has sufficient strength to overcome the adhesive force, thereby reducing the probability of the connection between the polygonal prism and the support plate breaking when the mold is opened.

[0009] Preferably, the control mechanism includes a first rod that is slidably disposed on the molding block along the mold opening direction, an inclined groove formed on the outer wall of the limiting post, and a second rod that is rotatably connected to the first rod; the end of the first rod is connected to the mounting plate, the end of the second rod extends into the inclined groove, and when the limiting post moves away from the mounting plate along with the molding block, the second rod drives the limiting post to rotate through the inclined groove.

[0010] By adopting the above technical solution, during mold closing, as the moving platen pushes the forming motion into the first slide groove, rod one and rod two move into the forming block. When rod two moves into the forming block, it drives the limiting post to rotate through the inclined groove, causing the mating rod to move into the horizontal groove. When the mold opens, the mating rod pulls the limiting post and the forming block out of the first slide groove. When the forming block moves out of the first slide groove, rod one and rod two move out of the forming block. When rod two moves out of the forming block, it drives the limiting post to reverse through the inclined groove, thereby causing the mating rod to enter the vertical groove.

[0011] Preferably, the molding block has a mounting hole on the side facing the mounting plate, and a first spring is provided in the mounting hole. One end of the first spring abuts against the mounting plate, and the other end of the first spring abuts against the molding block. The first spring always drives the molding block to move towards the lower mold body. When the mold is in the open state, the molding block is in the position furthest from the mounting plate under the action of the first spring, and the head of the first bolt abuts against the mounting plate.

[0012] By adopting the above technical solution, when the mold is in the open state, the first spring and the first bolt cooperate to restrict the sliding of the molding block, thereby restricting the sliding of rod one and rod two in the molding block. If rod two does not slide, the limiting post will not rotate, thus ensuring that the vertical groove is aligned with the mating rod, and the mating rod can be smoothly inserted into the vertical groove when the mold is closed.

[0013] Preferably, a third sliding groove is provided on the side wall of the insertion hole, and the core-pulling rod is slidably disposed in the third sliding groove. The driving mechanism includes a mounting block slidably disposed in the third sliding groove and connected to the core-pulling rod, a second spring disposed in the third sliding groove and sleeved on the core-pulling rod, a limiting block disposed on the side wall of the insertion hole, and an inclined surface disposed on the mounting block. The second spring and the limiting block are respectively located on both sides of the mounting block. The elastic force of the first spring is greater than that of the second spring. The elastic force of the second spring acts on the mounting block, and the second spring always drives the mounting block to move toward the limiting block. When the mold is in the open state, the second spring presses the mounting block against the limiting block, so that the pressing inclined surface extends into the insertion hole and the core-pulling rod is located in the third sliding groove. When the mold is closed, the limiting post is inserted into the insertion hole and presses against the inclined surface, so that the mounting block moves into the third sliding groove and the core-pulling rod moves out of the third sliding groove.

[0014] By adopting the above technical solution, when the mold is closed, the limiting post moves and inserts into the insertion hole. The limiting post will contact the inclined surface on the mounting block. Since the elastic force of the first spring is greater than that of the second spring, when the limiting post enters the insertion hole, it will push the mounting block into the third slide groove by pressing against the inclined surface. This will cause the second spring to be compressed and the core-pulling rod to move out of the third slide groove, preparing for the formation of the positioning hole. When the mold is opened, the limiting post moves out of the insertion hole, and the second spring will rebound to drive the mounting block to move out of the third slide groove, so that the core-pulling rod can move into the third slide groove, eliminating the interference of the core-pulling rod on the demolding of the bracket body.

[0015] Preferably, the core is detachably connected to an insert, the third sliding groove is formed on the insert, and the drive mechanism and the core-pulling rod are both located on the insert.

[0016] By adopting the above technical solution, it is convenient to open and process the third chute, and it is also convenient to install components such as mounting blocks.

[0017] Preferably, the mating rod includes a rod body three threadedly connected to the core and a tube body one rotatably mounted on the rod body three. The rod body three and the tube body one are coaxially arranged, and the tube body one is a wear-resistant alloy tube.

[0018] By adopting the above technical solution, the tube body can rotate when it enters the transverse groove, thereby reducing the friction between the tube body and the limiting post.

[0019] The main technical effects of this invention are reflected in the following aspects: 1. This invention converts the mold opening and closing force into the sliding power of the molding block through the limiting post and the matching rod, ensuring that the molding block can move smoothly when the mold opens; 2. This invention utilizes the cooperation of components such as limiting posts and mounting blocks to convert the mold opening and closing force into a force that controls the movement of the core-pulling rod; 3. The present invention converts the kinetic energy of the forming block into the kinetic energy of the limiting column rotation through the cooperation of rod one, rod two and inclined groove.

[0020] Figure 1 This is a structural diagram of a plastic luggage rack.

[0021] Figure 2 yes Figure 1 A magnified view of a portion of point A in the middle.

[0022] Figure 3 This is a schematic diagram of the injection mold in the closed state of this application.

[0023] Figure 4 yes Figure 3 A cross-sectional view of the injection mold along the BB line.

[0024] Figure 5 This is a structural diagram of a fixed template.

[0025] Figure 6 yes Figure 4 A magnified view of a section at point C.

[0026] Figure 7 yes Figure 6 A structural diagram of components such as mounting plate, forming block, forming rod, and limiting post.

[0027] Figure 8 yes Figure 3 A cross-sectional view of the injection mold along the DD line.

[0028] Figure 9 yes Figure 8 A magnified view of a section at point E in the middle.

[0029] Figure 10 This is a structural diagram of the limit post and control mechanism.

[0030] Figure 11 This is a structural diagram of the limit post and control mechanism from another angle.

[0031] Figure 12 This is a structural diagram of a moving template.

[0032] Figure 13 yes Figure 12 A magnified view of a section at point F.

[0033] Figure 14A schematic diagram of the insert, core-pulling rod, and drive mechanism in the mold closed state.

[0034] Reference numerals: 1. Upper mold body; 11. Fixed template; 111. Cavity; 112. First slide groove; 113. Mounting plate; 114. Forming block; 115. First bolt; 116. Mounting hole; 117. First spring; 12. Upper fixed plate; 121. Movable groove; 13. Forming rod; 2. Lower mold body; 21. Moving template; 211. Core; 212. Core-pulling rod; 213. Insertion hole; 214. Third slide groove; 215. Insert; 22. Mold foot; 23. Top plate; 24. Lower fixing plate; 25. Ejector pin; 3. Drive mechanism; 31. Mounting block; 32. Second spring; 33. Limiting block; 34. Inclined surface; 41. Chamber 1; 42. Chamber 2; 43. Limiting post; 44. Vertical groove; 45. Horizontal groove; 5. Matching rod; 51. Rod 3; 52. Tube 1; 6. Control mechanism; 61. Rod 1; 62. Inclined groove; 63. Rod 2; 7. Bracket body; 71. Positioning hole; 72. Support plate; 73. Polyhedral prism; 8. Bushing. Detailed Implementation

[0035] The present invention will be further described in detail below with reference to the accompanying drawings, so that the technical solution of this application can be more easily understood and mastered.

[0036] Reference Figures 3-5 This embodiment of a luggage plastic bracket injection molding mold includes an upper mold body 1 and a lower mold body 2. The upper mold body 1 includes a fixed template 11 and an upper fixing plate 12. The fixed template 11 is provided with a cavity 111. The upper fixing plate 12 is formed by connecting two metal plates.

[0037] Reference Figures 3-5 A first groove 112 is provided on the cavity 111, and the first groove 112 penetrates the fixed template 11. A mounting plate 113 is fixed on the fixed template 11, and the mounting plate 113 blocks the groove of the first groove 112 near the upper fixed plate 12. A forming block 114 for forming the support plate 72 is slidably arranged in the first groove 112 along the mold opening direction, wherein the forming block 114 is located on the side of the mounting plate 113 near the lower mold body 2.

[0038] Reference Figure 4 and Figure 6Two movable slots 121 are provided on the upper fixed plate 12, both located on the side of the mounting plate 113 facing away from the mold body 2. A first bolt 115 is movably installed in each of the two movable slots 121. Two mounting holes 116 are provided on the side of the molding block 114 facing the mounting plate 113. The threads of the two first bolts 115 pass through the mounting plate 113 and extend into the two mounting holes 116 respectively, then connect to the molding block 114. Two first springs 117 are placed in the two mounting holes 116 respectively, and the two first springs 117 are sleeved on the threads of the two first bolts 115.

[0039] Reference Figure 6 One end of each of the two first springs 117 abuts against the mounting plate 113, and the other end of each of the two first springs 117 abuts against the molding block 114. The two first springs 117 are always in a compressed state and constantly drive the molding block 114 towards the lower mold body 2. When the mold is in the open state, the molding block 114 is in the position furthest from the mounting plate 113 under the action of the two first springs 117, and the heads of the two first bolts 115 abut against the mounting plate 113.

[0040] Reference Figure 6 and Figure 7 The molding block 114 has a first cavity 41 for molding the polygonal prism 73. The mounting plate 113 has a molding rod 13, which extends into the molding block 114 and slides in cooperation with it. The end of the molding rod 13 away from the mounting plate 113 has a second cavity 42 for molding the polygonal prism 73. When the mold is in the closed state, the lower mold body 2 presses the molding block 114 against the mounting plate 113, and the first cavity 41 and the second cavity 42 are connected.

[0041] Reference Figures 7-11 A limiting post 43 is rotatably mounted on the end of the molding block 114 away from the mounting plate 113. A vertical groove 44 is formed on the outer wall of the limiting post 43, and a horizontal groove 45 is formed on the groove wall of the vertical groove 44. The molding block 114 is provided with a control mechanism 6 for controlling the rotation of the limiting post 43. The control mechanism 6 includes a first rod 61 slidably mounted on the molding block 114 along the mold opening direction, an inclined groove 62 formed on the outer wall of the limiting post 43, and a second rod 63 rotatably connected to the first rod 61.

[0042] Reference Figures 7-11One end of rod 61 is connected to mounting plate 113, while the other end of rod 61 has a hole for mounting rod 63. A bushing 8 is fitted onto one end of rod 61 and rotatably connected to the hole in rod 61. The other end of rod 63 extends into inclined groove 62. The axis of rod 63 is perpendicular to and intersects the axis of limiting post 43. When limiting post 43 moves closer to or away from mounting plate 113 following the movement of molding block 114, rod 63 drives limiting post 43 to rotate through inclined groove 62.

[0043] Reference Figure 3 , Figures 8-13 The lower mold body 2 includes a movable mold plate 21, two mold feet 22, two top plates 23, and a lower fixed plate 24. The movable mold plate 21 has a core 211, and the top plate 23 near the movable mold plate 21 has multiple ejector pins 25, the tops of which extend into the core 211. The core 211 has insertion holes 213 for inserting limiting pins 43. A mating rod 5 is provided on the side wall of the insertion hole 213, the axis of which is perpendicular to and intersects the axis of the limiting pin 43. The mating rod 5 includes a rod body 51 threaded into the core 211 and a tube body 52. ​​A bushing 8 is fitted onto the end of the rod body 51, and the tube body 52 is fitted onto the bushing 8 and can rotate relative to the rod body 51. The tube body 52 is a high-chromium alloy tube.

[0044] Reference Figures 8-14 A detachable insert 215 is connected to the core 211, and a portion of the insertion hole 213 is formed on the insert 215. A third slide groove 214 is formed on the insert 215, and a core-pulling rod 212 is slidably connected in the third slide groove 214 along the mold opening direction perpendicular to the mold. The core-pulling rod 212 is used to form the positioning hole 71. A drive mechanism 3 for driving the core-pulling rod 212 to slide is provided in the insert 215. The drive mechanism 3 includes a mounting block 31 slidably disposed in the third slide groove 214 and connected to the core-pulling rod 212 along the mold opening direction perpendicular to the mold, a second spring 32 disposed in the third slide groove 214 and sleeved on the core-pulling rod 212, a limiting block 33 fixed on the side wall of the insertion hole 213, and an inclined surface 34 formed on the end of the mounting block 31 near the insertion hole 213.

[0045] Reference Figures 8-14The second spring 32 and the limiting block 33 are located on both sides of the mounting block 31. The elastic force of the first spring 117 is greater than that of the second spring 32. The elastic force of the second spring 32 acts on the mounting block 31, and the second spring 32 always drives the mounting block 31 to move toward the limiting block 33. When the mold is in the open state, the second spring 32 presses the mounting block 31 against the limiting block 33, so that the pressing inclined surface 34 extends into the insertion hole 213 and the core-pulling rod 212 is located in the third slide groove 214. When the mold is closed, the limiting post 43 is inserted into the insertion hole 213 and presses against the inclined surface 34, so that the mounting block 31 moves into the third slide groove 214, the second spring 32 is compressed by force, and the core-pulling rod 212 moves out of the third slide groove 214, preparing for the forming positioning hole 71.

[0046] Reference Figure 3 -The complete injection molding steps for the mold in this application are as follows: First, the injection molding machine controls the lower mold body 2 to move closer to the upper mold body 1, causing the mold to close. During the mold closing process, the limiting post 43 is inserted into the insertion hole 213, and the tube body 52 is inserted into the vertical groove 44. When the limiting post 43 moves to insert into the insertion hole 213, the limiting post 43 will contact the inclined surface 34 on the mounting block 31. Since the elastic force of the first spring 117 is greater than the elastic force of the second spring 32, when the limiting post 43 enters the insertion hole 213, it will drive the mounting block 31 to move into the third slide groove 214 by pressing against the inclined surface 34. This will cause the second spring 32 to be compressed and the core pull rod 212 to move out of the third slide groove 214, preparing for the forming of the positioning hole 71.

[0047] When the moving template 21 moves to contact the forming block 114, the tube 52 stops moving in the vertical groove 44, at which point the tube 52 is facing the horizontal groove 45. Subsequently, the moving template 21 continues to move closer to the fixed template 11 and pushes the forming block 114 into the first sliding groove 112. During the process of the forming block 114 being pushed into the first sliding groove 112, the rod 61 and the second rod 63 move into the forming block 114, the two first springs 117 are compressed, and the forming rod 13 moves towards the cavity 41 in the forming block 114. When the second rod 63 moves into the forming block 114, it will drive the limiting post 43 to rotate through the inclined groove 62, so that the mating rod 5 moves into the horizontal groove 45.

[0048] After the mold is fully closed, the moving mold plate 21 presses the molding block 114 against the mounting plate 113, connecting cavity one 41 and cavity two 42. Once the mold is fully closed, the injection molding machine injects hot-melt plastic between the core 211 and the cavity 111, simultaneously filling cavity one 41 and cavity two 42. After the hot-melt plastic cools and solidifies, the injection molding of the bracket body 7 is complete.

[0049] Subsequently, the injection molding machine controls the mold to open, so that the lower mold body 2 moves away from the upper mold body 1. When the moving platen 21 moves away from the fixed platen 11, the tube body 52 pulls the limiting post 43 and the molding block 114 to move out of the first slide groove 112. When the molding block 114 moves out of the first slide groove 112, the rod body 61 and the rod body 63 will move out of the molding block 114. When the rod body 63 moves out of the molding block 114, it will drive the limiting post 43 to reverse through the inclined groove 62, so that the mating rod 5 enters the vertical groove 44.

[0050] When the molding block 114 slides out of the first slide groove 112, it presses the support plate 72 and the polygonal prism 73 onto the moving template 21, causing the polygonal prism 73 to move with the moving template 21 and detach from the cavity 42 on the molding rod 13, thereby releasing the adhesion between the polygonal prism 73 and the molding rod 13. When the molding block 114 slides out of the first slide groove 112, the two first springs 117 will also rebound synchronously. Subsequently, when the tube body 52 moves into the vertical groove 44, the heads of the two first bolts 115 abut against the mounting plate 113, thereby restricting the molding block 114 from continuing to move out of the first slide groove 112.

[0051] After the tube body 52 enters the vertical groove 44, it no longer pulls the limiting post 43 and the forming block 114 together to follow the moving template 21. Subsequently, as the moving template 21 continues to move, the tube body 52 will slide out of the vertical groove 44 along the mold opening direction, and the limiting post 43 will gradually disengage from the insertion hole 213. Meanwhile, the support plate 72 and the polygonal prism 73 follow the moving template 21 and disengage from the forming block 114, thus achieving complete demolding of the polygonal prism 73.

[0052] When the limiting post 43 moves out of the insertion hole 213, it gradually releases its pressure on the mounting block 31. The second spring 32 rebounds, driving the mounting block 31 to move towards the insertion hole 213, thereby allowing the inclined surface 34 to gradually move out of the third slide groove 214. When the pull rod 212 moves into the third slide groove 214, it will disengage from the latch. When the limiting post 43 moves to the point where it no longer abuts against the inclined surface 34, the pull rod 212 will fully enter the third slide groove 214.

[0053] After the mold is fully opened, the injection molding machine drives the two ejector pins 25 to move closer to the moving template 21, so that multiple ejector pins 25 push the formed bracket body 7 out of the core 211, thereby completing the complete injection molding of the bracket body 7.

[0054] The gap between the molding block 114 and the first slide groove 112 in this mold is very small to prevent hot melt plastic from flowing into the space between them. During injection molding, the mold expands due to heat, further reducing the gap between the sidewalls of the molding block 114 and the first slide groove 112. This further expels air from between them, creating a vacuum-like state. At this point, atmospheric pressure presses the molding block 114 tightly into the first slide groove 112. Therefore, when the mold opens, the sliding of the molding block 114 requires enormous power to overcome the pressure exerted by atmospheric pressure on the contact area. In this embodiment, the mold uses a mating rod 5 and a limiting post 43 to drive the movement of the molding block 114, converting the power from the injection molding machine to open the mold into the power for the sliding of the molding block 114. This provides a stable and sufficient force to ensure the sliding of the molding block 114 when the mold opens.

[0055] Of course, the above are just typical examples of this application. In addition, this application may have many other specific implementation methods. All technical solutions formed by equivalent substitution or equivalent transformation fall within the scope of protection claimed in this application.

Claims

1. A luggage plastic bracket injection molding die, comprising an upper mold body (1) and a lower mold body (2), wherein the upper mold body (1) comprises a fixed template (11) and an upper fixing plate (12), and the fixed template (11) is provided with a cavity (111); the lower mold body (2) comprises a movable template (21), and the movable template (21) is provided with a core (211), characterized in that: A core-pulling rod (212) is slidably provided on the core (211) along the mold opening direction perpendicular to the mold. The core-pulling rod (212) is used to form a positioning hole (71). The core (211) is provided with a driving mechanism (3) for driving the core-pulling rod (212) to slide. The cavity (111) is provided with a first sliding groove (112), and the fixed template (11) is fixed with an mounting plate (113). The mounting plate (113) blocks the groove of the first sliding groove (112) near the upper fixed plate (12). A forming block (114) for forming a support plate (72) is slidably arranged in the first sliding groove (112). The upper fixed plate (12) is provided with a movable groove (121), and a first bolt (115) is arranged in the movable groove (121). The screw of the first bolt (115) passes through the mounting plate (113) and is connected to the forming block (114). The molding block (114) is provided with a first chamber (41) for molding a polygonal prism (73), and the mounting plate (113) is provided with a molding rod (13). The molding rod (13) extends into the molding block (114) and slides with the molding block (114). The end of the molding rod (13) away from the mounting plate (113) is provided with a second chamber (42) for molding a polygonal prism (73). When the mold is in the mold-closed state, the lower mold body (2) presses the molding block (114) against the mounting plate (113). The molding rod (13) is completely located inside the molding block (114). The first chamber (41) and the second chamber (42) are connected to form a contour cavity for molding a polygonal prism (73). The molding block (114) is rotatably provided with a limiting post (43), the core (211) is provided with an insertion hole (213) for the limiting post (43) to be inserted, the side wall of the insertion hole (213) is provided with a matching rod (5), the axis of the matching rod (5) is perpendicular to and intersects the axis of the limiting post (43), the outer wall of the limiting post (43) is provided with a vertical groove (44), the groove wall of the vertical groove (44) is provided with a horizontal groove (45), and the molding block (114) is provided with a control mechanism (6) for controlling the rotation of the limiting post (43); During the mold closing process, the limiting post (43) is inserted into the insertion hole (213), and the mating rod (5) is inserted into the vertical groove (44). When the moving template (21) moves to abut against the forming block (114), the mating rod (5) moves to face the horizontal groove (45). During the process of the forming block (114) being pushed into the first sliding groove (112), the control mechanism (6) drives the limiting post (43) to rotate so that the mating rod (5) moves into the horizontal groove (45). During the mold opening process, the mating rod (5) pulls the limiting post (43), the forming block (114), and the first bolt (115) to move with the lower mold body (2), and the polygonal prism (73) moves away from the cavity (111) and disengages from the forming rod (13) along with the moving template (21); during the process of the mating rod (5) pulling the limiting post (43), the control mechanism (6) controls the limiting post (43) to rotate so that the mating rod (5) moves synchronously into the vertical groove (44); as the mold opens, the mating rod (5) slides out of the vertical groove (44) along the mold opening direction, the support plate (72) and the polygonal prism (73) move with the moving template (21) and disengage from the forming block (114).

2. The injection molding mold for a plastic luggage bracket according to claim 1, characterized in that: The control mechanism (6) includes a first rod (61) slidably disposed on the molding block (114) along the mold opening direction, a slanted groove (62) opened on the outer wall of the limiting post (43), and a second rod (63) rotatably connected to the first rod (61); the end of the first rod (61) is connected to the mounting plate (113), and the end of the second rod (63) extends into the slanted groove (62). When the limiting post (43) moves away from the mounting plate (113) along with the molding block (114), the second rod (63) drives the limiting post (43) to rotate through the slanted groove (62).

3. The injection molding mold for a plastic luggage bracket according to claim 2, characterized in that: The molding block (114) has a mounting hole (116) on the side facing the mounting plate (113). A first spring (117) is provided in the mounting hole (116). One end of the first spring (117) abuts against the mounting plate (113), and the other end of the first spring (117) abuts against the molding block (114). The first spring (117) always drives the molding block (114) to move towards the lower mold body (2). When the mold is in the open state, the molding block (114) is in the position furthest from the mounting plate (113) under the action of the first spring (117), and the head of the first bolt (115) abuts against the bottom wall of the mounting plate (113).

4. The injection molding mold for a plastic luggage bracket according to claim 3, characterized in that: A third groove (214) is provided on the side wall of the insertion hole (213). The core pull rod (212) is slidably disposed in the third groove (214). The driving mechanism (3) includes a mounting block (31) slidably disposed in the third groove (214) and connected to the core pull rod (212), a second spring (32) disposed in the third groove (214) and sleeved on the core pull rod (212), a limiting block (33) disposed on the side wall of the insertion hole (213), and an inclined surface (34) formed on the mounting block (31). The second spring (32) and the limiting block (33) are respectively located on both sides of the mounting block (31). The elastic force of the first spring (117) is greater than that of the second spring (32). The elastic force of the second spring (32) acts on the mounting block (31), and the second spring (32) always drives the mounting block (31) to move toward the limiting block (33). When the mold is in the open state, the second spring (32) presses the mounting block (31) against the limiting block (33) so that the pressing inclined surface (34) extends into the insertion hole (213) and the core pull rod (212) is located in the third slide groove (214). When the mold is closed, the limiting post (43) is inserted into the insertion hole (213) and presses against the inclined surface (34) so ​​that the mounting block (31) moves into the third slide groove (214), the second spring (32) is compressed by force, and the core pull rod (212) moves out of the third slide groove (214).

5. The injection molding mold for a plastic luggage bracket according to claim 4, characterized in that: The core (211) is detachably connected to an insert (215), the third slide groove (214) is opened on the insert (215), and the drive mechanism (3) and the core-pulling rod (212) are both located on the insert (215).

6. The injection molding mold for a plastic luggage bracket according to claim 1, characterized in that: The mating rod (5) includes a rod body three (51) threadedly connected to the core (211) and a tube body one (52) rotatably disposed on the rod body three (51). The rod body three (51) and the tube body one (52) are coaxially arranged, and the tube body one (52) is a wear-resistant alloy tube.

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