Direct-ejection inner-pulling structure of automobile plastic part injection mold

Abstract

The utility model provides an automobile plastic part injection mold straight ejection inner pulling structure which comprises an upper mold and a forming rod, an inclined hole is formed in the upper mold, the inclined hole is communicated with a cavity of the upper mold, the forming rod is connected in the inclined hole in a sliding mode, the automobile plastic part injection mold straight ejection inner pulling structure further comprises an elastic piece, a containing hole and a protruding part, the containing hole is formed in the upper mold and communicated with the inclined hole, and the protruding part is connected in the containing hole in a sliding mode. The elastic piece is arranged in the containing hole, the protruding part is fixed to the end, away from the cavity, of the forming rod and located outside the containing hole, one end of the elastic piece abuts against the inner wall of the containing hole, the other end of the elastic piece abuts against the protruding part, and the protruding part is used for abutting against the lower die. The purpose of reducing the maintenance cost and the production cost is achieved.

Description

Technical Field

[0001] This utility model relates to injection molds, and more particularly, to a direct-ejection internal extraction structure for an injection mold of automotive plastic parts. Background Technology

[0002] Currently, Chinese patent CN221518638U discloses an injection mold for a vehicle-mounted built-in storage box, which relates to the field of injection molding technology. It includes a lower mold and an upper mold. An injection tube is provided on the top of the upper mold, and hollow tubes are provided on both sides of the injection tube. The hollow tubes are slidably connected to the upper mold in the vertical direction. A top material frame is fixedly connected to the bottom of the hollow tubes. A receiving cavity is opened on the top wall of the upper mold cavity. The side of the top material frame near the injection tube is open. A processing mechanism is provided inside the top material frame.

[0003] During demolding, the upper mold moves upward while the ejector frame and movable block remain stationary, thus separating the storage box from the upper mold. When the upper mold moves upward to a certain distance, it will push the trigger mechanism, which in turn drives the extrusion mechanism downward. The extrusion mechanism then extrudes the movable block, bringing the two movable blocks closer together. This causes the two sprue cutters to come closer together and cut off the sprue material, eliminating the need for manual handling of the sprue material, reducing the number of processes, and improving overall processing efficiency.

[0004] However, when it is necessary to form angled holes in the mold, the current method involves fixing an inclined cylinder to the lower mold, then fixing a forming rod to the cylinder's telescopic shaft and inserting the forming rod into the cavity. Before the upper mold moves, the cylinder is activated to pull the forming rod out of the cavity, and then the upper mold moves. However, cylinders are expensive, and the air pipes they rely on are prone to aging and damage at high temperatures, resulting in high maintenance costs. Utility Model Content

[0005] In view of this, the purpose of this utility model is to provide a direct-top internal extraction structure for automotive plastic injection molds, so as to reduce production and maintenance costs.

[0006] To solve the above-mentioned technical problems, the technical solution of this utility model is: a direct-ejection internal extraction structure for an automotive plastic injection mold, including an upper mold and a forming rod. The upper mold has an oblique hole that communicates with the cavity of the upper mold. The forming rod is slidably connected in the oblique hole. The mold also includes an elastic element, a placement hole, and a protrusion. The placement hole is located on the upper mold and communicates with the oblique hole. The elastic element is placed in the placement hole. The protrusion is fixed to the end of the forming rod away from the cavity and located outside the placement hole. One end of the elastic element abuts against the inner wall of the placement hole, and the other end of the elastic element abuts against the protrusion. The protrusion is used to abut against the lower mold.

[0007] To achieve the above technical solution, the elastic element is placed in the placement hole, and the forming rod is passed through the elastic element and its end is inserted into the cavity, so that the protrusion abuts against the elastic element. When the upper mold and the lower mold abut, the pressure between the inner wall of the placement hole and the protrusion and the lower mold causes the elastic element to compress and generate elastic force. After injection molding, the upper mold moves away from the lower mold. Through the elastic force of the elastic element, the protrusion moves along the placement hole and the forming rod automatically disengages from the cavity, thus obtaining an oblique hole on the product. The structure is simple, and the production and maintenance costs are low.

[0008] As a preferred embodiment of this utility model, a filling section is fixedly connected to the outer wall of the forming rod, and the filling section is used to abut against the inner wall of the elastic element.

[0009] To achieve the above technical solution, the filling section makes the deformation of the elastic element more uniform and the elastic force direction of the elastic element more stable.

[0010] As a preferred embodiment of this utility model, the upper mold has a fixing hole on the side facing the lower mold, and a sliding rod for pushing the upper mold to move away from the lower mold is fixedly connected in the fixing hole.

[0011] To achieve the above technical solution, the slide bar is fixed in the fixing hole, and the slide bar moves along its own axis, which makes the movement of the upper mold more stable.

[0012] In a preferred embodiment of this utility model, the upper mold is provided with a connecting recess, which communicates with the placement hole. The placement hole is located inside the connecting recess, and an anti-detachment plate is provided inside the connecting recess. The anti-detachment plate is connected to the protrusion, and the anti-detachment plate is fixedly connected to the upper mold by a positioning bolt.

[0013] To achieve the above technical solution, the anti-detachment plate is connected to the protrusion, and the anti-detachment plate is fixed to the upper mold by a positioning bolt. The elastic element is compressed to generate elastic force. The positioning bolt is removed from the upper mold, and the anti-detachment plate, the protrusion, and the forming rod can be moved by the elastic force of the elastic element, so that the forming rod is moved out of the cavity. Thus, the lower mold does not need to apply force to the anti-detachment plate and the protrusion to achieve the deformation of the elastic element, thereby improving practicality.

[0014] In a preferred embodiment of this utility model, the anti-detachment plate is provided with an installation hole, the protrusion passes through the installation hole, the inner wall of the installation hole is provided with a positioning recess, the positioning recess is arranged radially along the installation hole, a positioning rod is slidably connected in the positioning recess, an elastic element is connected between the positioning rod and the inner wall of the positioning recess, a limiting recess is provided on the outer wall of the protrusion, and the end of the positioning rod away from the elastic element is embedded in the limiting recess.

[0015] To achieve the above technical solution, the protrusion is inserted into the mounting hole. Through the elastic force of the elastic element, the positioning rod abuts against the outer wall of the protrusion. As the protrusion continues to move between the anti-detachment plate and the anti-detachment plate, when the limiting recess corresponds to the positioning rod, the elastic force of the elastic element causes the positioning rod to be embedded in the limiting recess. The resulting frictional force achieves relative fixation between the anti-detachment plate and the protrusion.

[0016] As a preferred embodiment of this utility model, the anti-detachment plate is provided with a positioning hole for inserting a positioning bolt. The inner wall of the positioning hole is provided with a connecting groove communicating with the mounting hole. An elastic component is provided in the connecting groove. The positioning bolt is inserted into the positioning hole and abuts against the protrusion through the elastic component, so as to facilitate the installation and removal of the anti-detachment plate and the protrusion.

[0017] To achieve the above technical solution, the positioning bolt is passed through the positioning hole and threadedly connected to the upper mold. At the same time, the elastic component is pressed against the protrusion to make the protrusion less likely to move.

[0018] As a preferred embodiment of this utility model, the elastic component includes a first slider, a second slider, and a spring piece. The first slider and the second slider are both slidably connected in the connecting groove. The two ends of the spring piece are fixedly connected to the first slider and the second slider, respectively. The first slider is used to abut against the outer wall of the protrusion. The end of the second slider is provided with a guide slope for abutting against the positioning bolt.

[0019] To achieve the above technical solution, the positioning bolt is inserted into the positioning hole, and the positioning bolt abuts against the guide slope, causing the second slider to move along the connecting groove. The spring is compressed to generate elastic force, which causes the first slider to generate a squeezing force on the protrusion, making the protrusion less likely to separate from the anti-detachment plate, thereby further improving the stability of the forming rod. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the external structure of an embodiment;

[0021] Figure 2 This diagram illustrates the location of the anti-detachment plate;

[0022] Figure 3 An exploded view is provided to illustrate this utility model;

[0023] Figure 4 A cross-sectional diagram illustrating the placement hole;

[0024] Figure 5 To illustrate the structural diagram of the filled section;

[0025] Figure 6 To illustrate the structure of the anti-detachment plate;

[0026] Figure 7To illustrate the structural diagram of the elastic component;

[0027] Figure 8 A schematic diagram illustrating the structure of the positioning rod.

[0028] Reference numerals: 1. Upper mold; 11. Slanted hole; 12. Placement hole; 13. Elastic element; 2. Forming rod; 21. Protrusion; 211. Limiting recess; 22. Filling section; 31. Fixing hole; 32. Slide rod; 4. Connecting recess; 41. Anti-detachment plate; 51. Mounting hole; 52. Positioning recess; 53. Positioning rod; 54. Elastic element; 6. Positioning hole; 61. Connecting groove; 7. Elastic assembly; 71. First slider; 72. Second slider; 73. Spring piece; 8. Guide slope. Detailed Implementation

[0029] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings, so that the technical solution of this utility model can be more easily understood and mastered.

[0030] A direct-ejection internal extraction structure for an automotive plastic injection mold includes an upper mold 1 and a forming rod 2. An oblique hole 11 is provided on the upper mold 1, and the oblique hole 11 communicates with the cavity of the upper mold 1. The forming rod 2 is slidably connected in the oblique hole 11, and its end extends into the cavity.

[0031] A placement hole 12 is formed on the upper mold 1 and communicates with the inclined hole 11. The placement hole 12 and the inclined hole 11 are coaxially arranged. An elastic element 13, which is a spring, is placed in the placement hole 12. A protrusion 21 is integrally connected to the end of the forming rod 2 away from the cavity and is located outside the placement hole 12. The protrusion 21 and the forming rod 2 are coaxially arranged. One end of the elastic element 13 abuts against the inner wall of the placement hole 12, and the other end of the elastic element 13 abuts against the protrusion 21.

[0032] A filling section 22 is fixedly connected to the outer wall of the forming rod 2. The filling section 22 is used to abut against the inner wall of the elastic member 13. The cross section of the filling section 22 is circular and is coaxial with the forming rod 2.

[0033] Multiple fixing holes 31 are provided on the side of the upper mold 1 facing the lower mold. A sliding rod 32 for pushing the upper mold 1 away from the lower mold is fixedly connected in each fixing hole 31. The axes of the multiple fixing holes 31 are arranged in parallel.

[0034] A connecting recess 4 is provided in the upper mold 1. The connecting recess 4 is connected to the placement hole 12. The placement hole 12 is located inside the connecting recess 4. An anti-detachment plate 41 is provided inside the connecting recess 4.

[0035] A circular mounting hole 51 is provided on the anti-detachment plate 41, and the protrusion 21 passes through the mounting hole 51. A circular positioning recess 52 is provided on the inner wall of the mounting hole 51, and the positioning recess 52 is arranged radially along the mounting hole 51. A positioning rod 53 is slidably connected in the positioning recess 52, and an elastic element 54, which is a spring, is connected between the positioning rod 53 and the inner wall of the positioning recess 52. A limiting recess 211 is provided on the outer wall of the protrusion 21, and the end of the positioning rod 53 away from the elastic element 54 is embedded in the limiting recess 211. The cross-section of the limiting recess 211 is semi-circular. The end of the positioning rod 53 near the limiting recess 211 is hemispherical.

[0036] Insert the protrusion 21 into the mounting hole 51, and press the positioning rod 53 into the positioning recess 52 by hand. When the end of the protrusion 21 corresponds with the positioning rod 53, release the positioning rod 53. The elastic force of the elastic member 54 makes the positioning rod 53 press against the outer wall of the protrusion 21. As the anti-detachment plate 41 continues to move closer to the protrusion 21, when the limiting recess 211 corresponds with the positioning rod 53, the positioning rod 53 is embedded in the limiting recess 211, and the resulting friction positions the protrusion 21.

[0037] By applying a force to the anti-detachment plate 41 in a direction away from the protrusion 21, the friction between the positioning rod 53 and the limiting recess 211 can be overcome, and the anti-detachment plate 41 can be separated from the protrusion 21, which is simple to operate.

[0038] The anti-detachment plate 41 has a positioning hole 6 for a positioning bolt (not shown in the figure) to pass through. The inner wall of the positioning hole 6 has a connecting groove 61 that communicates with the mounting hole 51. The cross-section of the connecting groove 61 is square. An elastic component 7 is provided in the connecting groove 61. The positioning bolt passes through the positioning hole 6 and is pressed against the protrusion 21 by the elastic component 7. Then, the positioning bolt is threaded to the inner wall of the connecting recess 4, and the positioning bolt is pressed against the anti-detachment plate 41 to fix the anti-detachment plate 41 in the connecting recess 4.

[0039] The elastic component 7 includes a first slider 71, a second slider 72, and a spring piece 73. Both the first slider 71 and the second slider 72 are slidably connected in the connecting groove 61. The spring piece 73 is a spring, and its two ends are fixedly connected to the first slider 71 and the second slider 72 respectively. The first slider 71 is used to abut against the outer wall of the protrusion 21. The end of the second slider 72 has a guide slope 8 for contacting the positioning bolt.

[0040] The positioning pin is inserted into the positioning hole 6, and the positioning pin abuts against the guide slope 8. The second slider 72 moves along the connecting groove 61 towards the first slider 71. The spring piece 73 deforms and applies elastic force to the first slider 71, so that the first slider 71 applies pressure to the protrusion 21. The resulting friction makes the protrusion 21 and the forming rod 2 less likely to move, which can improve the forming quality of the inclined hole 11 during the injection molding process.

[0041] Of course, the above are just typical examples of this utility model. In addition, this utility model may have many other specific implementation methods. All technical solutions formed by equivalent substitution or equivalent transformation fall within the scope of protection claimed by this utility model.

Claims

1. A direct-ejection internal extraction structure for an automotive plastic injection mold, comprising an upper mold (1) and a forming rod (2), wherein the upper mold (1) has an oblique hole (11) communicating with the cavity of the upper mold (1), and the forming rod (2) is slidably connected in the oblique hole (11), characterized in that: It also includes an elastic element (13), a placement hole (12), and a protrusion (21). The placement hole (12) is opened on the upper mold (1) and communicates with the oblique hole (11). The elastic element (13) is placed in the placement hole (12). The protrusion (21) is fixed to the end of the forming rod (2) away from the cavity and located outside the placement hole (12). One end of the elastic element (13) abuts against the inner wall of the placement hole (12), and the other end of the elastic element (13) abuts against the protrusion (21). The protrusion (21) is used to abut against the lower mold.

2. The direct-ejection internal extraction structure of an automotive plastic injection mold according to claim 1, characterized in that: A filling section (22) is fixedly connected to the outer wall of the forming rod (2), and the filling section (22) is used to abut against the inner wall of the elastic member (13).

3. The direct-ejection internal extraction structure of an automotive plastic injection mold according to claim 1, characterized in that: The upper mold (1) has a fixing hole (31) on the side facing the lower mold, and a slide rod (32) for pushing the upper mold (1) to move away from the lower mold is fixedly connected in the fixing hole (31).

4. The direct-ejection internal extraction structure of an automotive plastic injection mold according to claim 1, characterized in that: The upper mold (1) is provided with a connecting recess (4), which is connected to the placement hole (12). The placement hole (12) is located inside the connecting recess (4). An anti-detachment plate (41) is provided inside the connecting recess (4). The anti-detachment plate (41) is connected to the protrusion (21). The anti-detachment plate (41) is fixedly connected to the upper mold (1) by a positioning bolt.

5. The direct-ejection internal extraction structure of an automotive plastic injection mold according to claim 4, characterized in that: The anti-detachment plate (41) is provided with an installation hole (51), the protrusion (21) passes through the installation hole (51), the inner wall of the installation hole (51) is provided with a positioning recess (52), the positioning recess (52) is arranged along the radial direction of the installation hole (51), a positioning rod (53) is slidably connected in the positioning recess (52), an elastic member (54) is connected between the positioning rod (53) and the inner wall of the positioning recess (52), a limiting recess (211) is provided on the outer wall of the protrusion (21), and the end of the positioning rod (53) away from the elastic member (54) is embedded in the limiting recess (211).

6. The direct-ejection internal extraction structure of an automotive plastic injection mold according to claim 5, characterized in that: The anti-detachment plate (41) is provided with a positioning hole (6) for inserting a positioning bolt. The inner wall of the positioning hole (6) is provided with a connecting groove (61) that communicates with the mounting hole (51). An elastic component (7) is provided in the connecting groove (61). The positioning bolt is inserted into the positioning hole (6) and abuts against the protrusion (21) through the elastic component (7).

7. The direct-ejection internal extraction structure of an automotive plastic injection mold according to claim 6, characterized in that: The elastic component (7) includes a first slider (71), a second slider (72), and a spring piece (73). The first slider (71) and the second slider (72) are slidably connected in the connecting groove (61). The two ends of the spring piece (73) are fixedly connected to the first slider (71) and the second slider (72) respectively. The first slider (71) is used to abut against the outer wall of the protrusion (21). The end of the second slider (72) is provided with a guide slope (8) for abutting against the positioning bolt.

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