A low-pressure injection mold for automobile handles

Abstract

The present invention belongs to the technical field of plastic injection molding, and in particular to a low-pressure injection mold for automobile handles. Aiming at the problem of a large amount of raw material waste generated during the injection molding of existing automobile handles, the following scheme is proposed. It includes a fixed mold base, a male mold head, a female mold, and a movable mold base. An injection port is embedded in the middle of the fixed mold base. The male mold head includes an outer shell sleeve with an opening facing the fixed mold base and having an overall rectangular box-shaped structure. A plurality of strip-shaped insertion holes distributed in an array are opened at the bottom of the groove of the outer shell sleeve. The same combined air duct is inserted into all the strip-shaped insertion holes. The combined air duct includes mold convex rib plates that are inserted into the strip-shaped insertion holes and are parallel to each other. The sides of all the mold convex rib plates are penetrated and communicated with the same U-shaped pipe. The present invention can reduce the range of flow dead zones generated in the far area of the mold cavity during injection molding, and can keep the raw materials in a molten state in the injection pipe warm during demolding. When injection molding is required again, it can be extruded continuously, greatly improving the utilization rate of raw materials.

Description

Technical Field

[0001] The present invention relates to the technical field of plastic injection molding, and in particular to a low-pressure injection mold for automotive handles. Background Art

[0002] An injection mold for automotive handles is a mold used to manufacture the outer shell or components of automotive handles, and usually adopts injection molding technology. The design of this mold needs to consider multiple factors, including the selection of materials, the shape and structure of the handle, the cooling system of the mold, and the efficiency and accuracy during the production process.

[0003] After retrieval, when injecting small automotive handles in the prior art, an injection method of multiple parts in one mold is usually adopted. Although this injection method can inject multiple formed products at one time, a lot of redundant connecting waste used to connect the products will be generated during the mold design. These wastes not only need to be removed one by one later, but also cause a large amount of raw material waste. Therefore, in view of this waste, we have designed a new type of injection mold that can not only have multiple parts in one mold, but also has no waste. Summary of the Invention

[0004] Aiming at the technical problem of a large amount of raw material waste generated during the injection of existing automotive handles, the present invention adopts the following technical solutions:

[0005] A low-pressure injection mold for automotive handles, including a fixed mold base, a male mold head, a female mold, and a moving mold base. An injection port is embedded in the middle of the fixed mold base. The male mold head includes an outer shell sleeve with an opening facing the fixed mold base and having an overall rectangular parallelepiped box-shaped structure. A plurality of strip-shaped insertion holes are arranged in an array at the bottom of the groove of the outer shell sleeve. The same combined air duct is inserted into all the strip-shaped insertion holes. The combined air duct includes mold convex rib plates inserted into the strip-shaped insertion holes and parallel to each other. The side surfaces of all the mold convex rib plates are penetrated and communicated with the same U-shaped tube; both ends of the U-shaped tube extend out of the outside of the outer shell sleeve, that is, the back of the device; and one of the tube orifices is an air inlet, which is connected to the air outlet of the fan during use to provide the power air source for air cooling of the device. A first mold groove adapted to the end shape of the mold convex rib plate is reserved on the side of the female mold close to the male mold head. The gap between the first mold groove and the mold convex rib plate, that is, the mold groove, is the final shape of the automotive handle; injection holes are opened at the bottom of the outer shell sleeve of the male mold head near the end of each strip-shaped insertion hole. All the injection holes are located close to the middle and symmetrically distributed. The same dendritic jet tube is inserted into all the injection holes; the jet tube includes a main feed pipe and a plurality of symmetric branch pipes, and the main feed pipe is slidably sleeved on the circumferential outer wall of the injection port. A spiral heating rod is wound around the outer wall of the branch pipe of the jet tube.

[0006] Preferably, an electric heater is fixedly connected to the middle of the side of the outer shell sleeve of the male mold head away from the air inlet of the combined air duct, and the output end of the electric heater is electrically connected to the spiral heating rod, which can supply heat to the spiral heating rod. The two are a set of electric heating equipment. Such a setting can make the maintenance of the equipment more convenient and reduce the failure rate.

[0007] Preferably, a fixed panel is fixed between the opening of the outer shell sleeve and the fixed mold base, and an installation round hole for the main feed pipe to pass through is opened in the middle of the fixed panel. A receiving sleeve is sleeved and fixed at one end of the main feed pipe of the jet pipe close to the installation round hole, and the whole receiving sleeve is in a horn-shaped structure; the injection port includes a thin pipe section and a thick pipe section, and the thin pipe section of the injection port is always slidably inserted into the circumferential inner wall of the main feed pipe; by such a setting, it can be ensured that when the material is withdrawn, the plastic raw material in a high-temperature molten state at the injection nozzle of the extruder will not leak at the interface of the main feed pipe; on one side of the fixed panel close to the fixed mold base and near the four corners, guide slide bars are fixedly arranged, and the guide slide bars are perpendicular to the fixed panel. On one side of the fixed mold base close to the fixed panel and near the four corners, spring sinking grooves are opened, and sliding insertion holes that form a sliding fit with the guide slide bars are opened at the bottom of the spring sinking grooves; a return tension spring is fixed between the bottom of each spring sinking groove and the fixed panel; it can be ensured that during injection molding or when preparing for injection molding, the fixed mold base and the male mold head are pressed together more tightly, that is, the injection port and the main feed pipe of the jet pipe are engaged more tightly, and raw material leakage from the gap is avoided.

[0008] Preferably, a discharging mechanism is arranged inside each of the mold convex rib plates of the combined air duct, and an embedding groove is opened in the middle of the side of each mold convex rib plate close to the female mold, and an anti-twist through hole is opened at the bottom of the embedding groove. The discharging mechanism includes a guide frame fixed inside the mold convex rib plate close to the anti-twist through hole, and a material withdrawing ejector rod is slidably connected in the guide frame; the end of the material withdrawing ejector rod close to the female mold is flush with the end of the mold convex rib plate, which can ensure that the surface of the finished product is flush and free of burrs; a bearing installation hole coaxial with the material withdrawing ejector rod is opened on the side of the combined air duct away from the embedding groove, and a sliding bearing is embedded in the bearing installation hole. A sliding ejector rod is slidably connected in the sliding bearing, and a connecting disc is reserved at one end of the sliding ejector rod close to the material withdrawing ejector rod. A pressing spring I is arranged between the connecting disc and the guide frame.

[0009] Preferably, round holes two coaxial with the sliding ejector rods are formed in the fixed panel, and pulley frames are fixed near the corresponding round holes two on the side of the fixed panel close to the combined air duct. Grooved pulleys are rotatably connected to the middle of each pulley frame. Two parallel rollers are arranged near the middle of one end of the fixed panel close to the fixed mold base, and bearing seats are arranged at both ends of each roller. All the sliding ejector rods are divided into two columns and are equidistant from the rollers on their respective sides. Steel wires are wound on each roller in the same direction. The number of steel wires on each roller is the same as the number of sliding ejector rods in the column on its side. The steel wires pass through the fixed panel, then bypass the corresponding pulleys and are fixed to the ends of the corresponding sliding ejector rods. A rope fixing block is fixed between the end of the sliding ejector rod and the steel wire. That is, when the roller is rotated, all the steel wires wound on it are pulled at the same time, and then through the steering action of the pulley, an axial pulling force is generated on all the sliding ejector rods in one column, thereby achieving the purpose of ejecting the finished product of the car handle. Driven gears are fixed to the ends of both rollers away from the electric heater. The two driven gears are symmetrical to each other and have a gap. A cross-shaped groove is reserved in the middle of the side of the fixed mold base close to the fixed panel. Rope holes are formed in the fixed panel near the winding position of each steel wire. The groove is provided to reserve space for the movement of the rollers and the sliding ejector rods.

[0010] Preferably, a double-sided rack is fixed between the two driven gears near the edge of the fixed mold base, and the double-sided rack meshes with the two driven gears at the same time. With the reset tension spring arranged in the spring sink, it can be ensured that during the first stage of demolding, that is, when the female mold just disengages, the discharging mechanism will not be triggered, and enough space for material withdrawal is reserved at this time. Then, by continuing to pull the whole male mold head to move, the double-sided rack and the two driven gears can be made to move relative to each other, thereby driving the two driven gears and the rollers to rotate, realizing the discharging of the finished product of the car handle.

[0011] Preferably, fixing blocks are fixed at both front and rear sides of the male mold head near the four corners, and a stripping pull rod is fixed at one end of each fixing block away from the fixed mold base. All the stripping pull rods are parallel to each other, and the axis line of the stripping pull rod is perpendicular to the fixed panel. The whole female mold is a cuboid box-like structure with an internal cavity, and the opening of the female mold is in the opposite direction to that of the male mold head. The moving mold base is hermetically fixed at the opening of the female mold, and the area of the moving mold base is larger than the opening area of the female mold. Through holes are formed at both sides of the moving mold base near the four corners close to the male mold head, and the size and position of the through holes are adapted to the corresponding stripping pull rods, and the stripping pull rods are slidably connected in the corresponding through holes. The total length of the stripping pull rods is greater than twice the total thickness of the female mold and the moving mold base, ensuring enough space for the finished product to be discharged. A limit block is fixed at one end of each stripping pull rod away from the male mold head, and the diameter of the limit block is larger than the aperture of the through hole. By providing the limit blocks and the stripping pull rods, when starting the discharging mechanism, after the first stage of demolding is completed, only need to continue to control the movement of the moving mold base, and at this time, the male mold head, the moving mold base and the female mold can be pulled together to move to the second stage of demolding, so as to realize the stripping of the finished product of the car handle.

[0012] Preferably, a traction fixing area is reserved in the middle of the side of the moving mold base away from the female mold. By providing the traction fixing area, it is convenient to fix with the large traction mechanism for overall discharging during use.

[0013] Preferably, a plurality of equally spaced mold grooves I are reserved on the side of the female mold close to the male mold head, and a plurality of partition plates distributed in a zigzag shape are fixed at the bottom of the mold grooves of the female mold. A water inlet pipe and a water outlet pipe are respectively inserted at the side of the female mold close to the top, and the water inlet pipe passes through a plurality of partition plates, which can make the cooling water flow in a longer path in the female mold to uniformly take away heat.

[0014] Preferably, the junction of the thin pipe section and the thick pipe section is a tapered pipe, and the flare taper of the receiving sleeve is adapted to the tapered pipe taper of the injection port, that is, they are completely fitted during injection molding. An annular groove is formed on the inner circumferential wall of the flare of the receiving sleeve, and a high-temperature resistant sealing ring is embedded in the annular groove. By setting like this, the sealing degree at this place during injection molding can be strengthened, and even under high-pressure injection molding, raw material leakage will not occur.

[0015] The beneficial effects of the present invention are as follows:

[0016] 1. By providing the jet pipes that can be separately branched to each mold groove position, not only can the range of flow dead angles generated in the far area of the mold groove during injection molding be reduced, but also the molten raw material in the jet pipes can be insulated during demolding and can be extruded continuously when injection molding is required again, greatly improving the utilization rate of the raw material.

[0017] 2. By setting a material receiving sleeve, an injection port, and a main feed pipe with adapted taper and length, it can be ensured that during injection molding or when preparing for injection molding, the fixed mold base and the male mold head are pressed more tightly together, that is, the injection port and the main feed pipe of the jet pipe are engaged more tightly, avoiding raw material leakage from the gap.

[0018] 3. Through the set discharging mechanism, when it is necessary to eject the finished product of the automotive handle buckled at the end of the mold convex rib plate, it is only necessary to control all the sliding ejector rods to axially slide towards one end of the ejection ejector rod at the same time, that is, continue to pull the moving mold base, and at this time, the finished product of the automotive handle can be ejected. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a schematic diagram of the overall structure of the present invention;

[0020] Figure 2 is a front view schematic diagram of the first stage of demolding of the present invention;

[0021] Figure 3 is a front view schematic diagram of the second stage of demolding of the present invention;

[0022] Figure 4 is a schematic diagram of the overall back structure of the present invention;

[0023] Figure 5 is a back view schematic diagram of the first stage of demolding of the present invention;

[0024] Figure 6 is a back view schematic diagram of the second stage of demolding of the present invention;

[0025] Figure 7 is an exploded view of the female mold and the moving mold base in the present invention;

[0026] Figure 8 is an assembly drawing of the fixed mold base and the male mold head in the present invention;

[0027] Figure 9 is a front view of the male mold head in the present invention;

[0028] Figure 10 For the present invention Figure 9 a cross-sectional view taken along line A-A;

[0029] Figure 11 is an exploded view of the internal structure of the male mold head in the present invention;

[0030] Figure 12 is a perspective view of the outer shell sleeve of the male mold head in the present invention.

[0031] In the figure: 1, fixed panel; 101, second round hole; 102, rope hole; 103, installation round hole; 2, injection port; 3, fixed mold base; 301, spring sinking groove; 4, male mold head; 401, strip-shaped jack; 402, injection pipe hole; 5, female mold; 501, first mold groove; 502, partition board; 6, water inlet pipe; 601, water outlet pipe; 7, ejection pull rod; 8, limit block; 9, moving mold base; 901, through hole; 10, electric heater; 1001, spiral heating rod; 11, combined air duct; 1101, mold convex rib plate; 12, reset tension spring; 13, guiding slide bar; 14, winding roller; 15, fixed block; 16, double-sided rack; 17, driven gear; 18, jet pipe; 19, ejection ejector rod; 20, bearing seat; 21, rope fixing block; 22, steel wire; 23, material receiving sleeve; 24, guiding frame; 25, first pressing spring; 26, sliding ejector rod; 27, fixed pulley frame. Specific embodiments

[0032] In the following, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments.

[0033] In this embodiment, refer to Figures 1-12, An automotive handle low-pressure injection mold, including a fixed mold base 3, a male mold head 4, a female mold 5, and a moving mold base 9. An injection port 2 is embedded in the middle of the fixed mold base 3. The male mold head 4 includes a housing sleeve with an opening facing the fixed mold base 3 and an overall rectangular box-shaped structure. Multiple strip-shaped insertion holes 401 are arranged in an array at the bottom of the housing sleeve. The same combined air duct 11 is inserted into all the strip-shaped insertion holes 401. The combined air duct 11 includes mold convex rib plates 1101 inserted into the strip-shaped insertion holes 401 and parallel to each other. The sides of all the mold convex rib plates 1101 communicate with the same U-shaped pipe through holes; both ends of the U-shaped pipe extend to the outside of the housing sleeve, that is, the back of the device; and one of the pipe orifices is an air inlet, which is connected to the air outlet of a blower during use to provide a power air source for air cooling of the device. On the side of the female mold 5 close to the male mold head 4, a first mold groove 501 adapted to the shape of the end of the mold convex rib plate 1101 is reserved. The gap between the first mold groove 501 and the mold convex rib plate 1101, that is, the mold groove, is the final shape of the automotive handle; at the bottom of the housing sleeve of the male mold head 4, injection holes 402 are opened near the end of each strip-shaped insertion hole 401. All the injection holes 402 are located close to the middle and symmetrically distributed. The same dendritic jet pipe 18 is inserted into all the injection holes 402; the jet pipe 18 includes a feed main pipe and multiple symmetric branches, and the feed main pipe is slidably sleeved on the circumferential outer wall of the injection port 2. A spiral heating rod 1001 is wound around the outer wall of the branch of the jet pipe 18; by providing the jet pipe 18 that can be separately branched to each mold groove position, not only can the range of flow dead zones generated in the far area of the mold groove during injection be reduced, but also the molten raw material in the jet pipe 18 can be kept warm during demolding and can be continuously extruded when injection molding is required again, greatly improving the utilization rate of the raw material.

[0034] In the present invention, referring to Figure 10 , in the middle of the side of the housing sleeve of the male mold head 4 away from the air inlet of the combined air duct 11, an electric heater 10 is fixedly connected, and the output end of the electric heater 10 is electrically connected to the spiral heating rod 1001, which can supply heat to the spiral heating rod 1001. The two form a set of electric heating equipment. Such a setting can make the maintenance of the equipment more convenient and reduce the failure rate.

[0035] Referring to Figures 8-12A fixed panel 1 is fixed between the opening of the outer shell and the fixed mold base 3, and a mounting circular hole 103 is opened in the middle of the fixed panel 1 for the feed pipe to pass through. A material receiving sleeve 23 is fixed to one end of the feed pipe of the jet tube 18 close to the mounting circular hole 103, and the material receiving sleeve 23 is a trumpet-shaped structure as a whole; the injection port 2 includes a thin tube section and a thick tube section, and the thin tube section of the injection port 2 is always slidably inserted into the circumferential inner wall of the feed pipe; by such an arrangement, it can be ensured that the high-temperature molten plastic raw material of the extruder injection nozzle will not leak at the interface of the feed pipe when the material is withdrawn; the fixed panel 1 is close to the fixed mold base A guide slide 13 is fixed on one side of 3 near the four corners, and the guide slide 13 is perpendicular to the fixed panel 1. A spring groove 301 is opened on the side of the fixed mold base 3 near the fixed panel 1 near the four corners, and the bottom of the spring groove 301 is opened with a sliding socket that forms a sliding fit with the guide slide 13; a reset spring 12 is fixed between the bottom of each spring groove 301 and the fixed panel 1; it can ensure that during injection molding or when preparing for injection molding, the fixed mold base 3 and the male mold head 4 are pressed more tightly, that is, the injection port 2 and the feed main pipe of the jet tube 18 are bitten more tightly to avoid leakage of raw materials from the gap.

[0036] Reference Figures 9-11 , the interior of the mold convex rib plate 1101 of the combined air duct 11 is provided with a discharge mechanism, and the mold convex rib plate 1101 is provided with an embedding groove in the middle of the side close to the mother mold 5, and the bottom of the embedding groove is provided with an anti-twist perforation, and the discharge mechanism includes a guide frame 24 fixed to the inside of the mold convex rib plate 1101 near the anti-twist perforation, and a material ejector rod 19 is slidably connected to the guide frame 24; the end of the material ejector rod 19 close to the mother mold 5 is flush with the end of the mold convex rib plate 1101, which can ensure that the surface of the finished product is flush and free of burrs; the side of the combined air duct 11 away from the embedding groove is provided with a material ejector rod 19 that is connected to the mold convex rib plate 1101. The material ejector rod 19 is coaxial with the bearing mounting hole, and a sliding bearing is embedded in the bearing mounting hole. A sliding ejector rod 26 is slidably connected to the sliding bearing, and a connecting disk is reserved at one end of the sliding ejector rod 26 close to the material ejector rod 19, and a tightening spring 25 is provided between the connecting disk and the guide frame 24; through the set discharging mechanism, when it is necessary to remove the finished car handle buckled on the end of the mold convex rib plate 1101, it is only necessary to control all the sliding ejectors 26 to slide axially toward one end of the material ejector rod 19 at the same time, and the finished car handle can be ejected at this time.

[0037] Reference Figures 9-11, a circular hole two 101 coaxial with the sliding ejector rod 26 is opened on the fixed panel 1, and a fixed pulley bracket 27 is fixed near the corresponding circular hole two 101 on the side of the fixed panel 1 close to the combined air duct 11, and a grooved fixed pulley is rotatably connected in the middle of the fixed pulley bracket 27; two parallel rollers 14 are arranged near the middle of one end of the fixed panel 1 close to the fixed mold base 3, and bearing seats 20 are arranged at both ends of the roller 14. All the sliding ejector rods 26 are divided into two columns and are equidistant from the roller 14 on their respective sides. And a steel wire 22 is wound on each roller 14 in the same direction. The number of steel wires 22 on each roller 14 is the same as the number of sliding ejector rods 26 in the column on that side. And the steel wire 22 passes through the fixed panel 1, then bypasses the corresponding fixed pulley and is fixed at the end of the corresponding sliding ejector rod 26. A rope fixing block 21 is fixed between the end of the sliding ejector rod 26 and the steel wire 22. That is, when the roller 14 rotates, all the steel wires 22 wound on it are pulled at the same time. Then, through the steering action of the fixed pulley, an axial pulling force is generated on all the sliding ejector rods 26 in one column, and then the purpose of ejecting the finished product of the car handle is realized; both ends of the two rollers 14 far from the electric heater 10 are fixed with driven gears 17, and the two driven gears 17 are symmetrical to each other and have a gap; a cross-shaped groove is reserved in the middle of the side of the fixed mold base 3 close to the fixed panel 1. Rope holes 102 are opened on the fixed panel 1 near the winding place of each steel wire 22. Through the arranged groove, space is reserved for the movement of the roller 14 and the sliding ejector rod 26.

[0038] Refer to Figure 6 and Figure 8 , a double-sided rack 16 is fixed near the edge of the fixed mold base 3 between the two driven gears 17, and the double-sided rack 16 meshes with the two driven gears 17 at the same time; with the arrangement of the return spring 12 in the mating spring sink 301, during the first stage of demolding, that is, when the female mold 5 just detaches, the discharging mechanism will not be touched. At this time, enough space for material withdrawal is reserved; then continue to pull the whole male mold head 4 to move, and the double-sided rack 16 and the two driven gears 17 can be made to move relative to each other, and then drive the two driven gears 17 and the roller 14 to rotate, realizing the material withdrawal of the finished product of the car handle.

[0039] Refer to Figures 4-7, on both the front and back sides of the male mold head 4 near the four corners, fixing blocks 15 are fixed, and at one end of each fixing block 15 away from the fixed mold base 3, a stripping pull rod 7 is fixed. All the stripping pull rods 7 are parallel to each other, and the axis line of the stripping pull rod 7 is perpendicular to the fixed panel 1. The overall shape of the female mold 5 is a cuboid box-like structure with an internal cavity, and the opening direction of the female mold 5 is opposite to that of the male mold head 4. The moving mold base 9 is hermetically fixed at the opening of the female mold 5, and the area of the moving mold base 9 is larger than the area of the opening of the female mold 5. Near the four corners on the side of the moving mold base 9 close to the male mold head 4, through holes 901 are opened, and the size and position of the through holes 901 are adapted to the corresponding stripping pull rods 7, and the stripping pull rods 7 are slidably connected in the corresponding through holes 901. The total length of the stripping pull rods 7 is greater than twice the total thickness of the female mold 5 and the moving mold base 9; ensuring that enough space is reserved for the finished product to be discharged. At one end of each stripping pull rod 7 away from the male mold head 4, a limit block 8 is fixed, and the diameter of the limit block 8 is larger than the aperture of the through hole 901; by providing the limit blocks 8 and the stripping pull rods 7, when starting the discharging mechanism, after the first stage of demolding is completed, only need to continue to control the movement of the moving mold base 9, and at this time, the male mold head 4, the moving mold base 9 and the female mold 5 can be pulled together to move to the second stage of demolding to realize the stripping of the finished product of the car handle.

[0040] Refer to Figure 6 , in the middle of the side of the moving mold base 9 away from the female mold 5, a traction fixing area is reserved. By providing the traction fixing area, it is convenient to fix with the large traction mechanism for overall discharging during use.

[0041] Refer to Figure 2 and Figure 7 , on the side of the female mold 5 close to the male mold head 4, equally spaced mold grooves 501 are reserved, and at the bottom of the mold grooves of the female mold 5, a plurality of partition plates 502 distributed in a zigzag shape are fixed; on the side of the female mold 5 near the top, a water inlet pipe 6 and a water outlet pipe 601 are respectively inserted. The water inlet pipe 6 passes through a plurality of partition plates 502, which can make the cooling water flow in a longer path in the female mold 5 to evenly take away heat.

[0042] In this solution, the junction of the thin pipe section and the thick pipe section is a tapered pipe, and the flare taper of the receiving sleeve 23 is adapted to the taper of the tapered pipe of the injection port 2, that is, they are completely fitted during injection molding; and on the circumferential inner wall of the flare of the receiving sleeve 23, an annular groove is opened, and a high-temperature resistant sealing ring is installed in the annular groove. By setting like this, the sealing degree at this place during injection molding can be strengthened, and even in the case of high-pressure injection molding, raw material leakage will not occur.

[0043] Working principle: When this device is in use, the fixed mold base 3, male mold head 4, female mold 5 and moving mold base 9 are combined together. At this time, a mold cavity to be injection-molded is formed between the protruding end of the mold convex rib plate 1101 and the first mold cavity 501. Then, the electric heater 10 is started to heat the branch pipe of the jet pipe 18, ensuring that the molten plastic does not freeze and fix when flowing through the inner wall of the jet pipe 18, thus forming a blockage. After the injection molding is completed, cooling is carried out; liquid cooling is adopted inside the female mold 5, and air cooling is adopted inside the male mold head 4; after the cooling is completed, the moving mold base 9 and the female mold 5 are controlled to move together to the first demolding stage. At this time, the female mold 5 is in the just-separated state and will not touch the discharging mechanism, leaving enough space for material withdrawal; then, continuing to pull the moving mold base 9 will drive the male mold head 4 to move as a whole, enabling the bilateral racks 16 to form relative movement with the two driven gears 17, and then driving the two driven gears 17 and the roller 14 to rotate; at this time, the discharging mechanism is also driven to start, that is, all the discharging ejector rods 19 are ejected from the embedded grooves to eject the finished product of the car handle; then, moving the moving mold base 9 in the reverse direction can automatically reset it.

[0044] The above are only the preferred specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution of the present invention and its inventive concept, makes equivalent substitutions or changes, and all should be covered within the protection scope of the present invention.

Claims

1. A low-pressure injection mold for an automotive handle, comprising a fixed mold base (3), a male mold head (4), a female mold (5) and a movable mold base (9). An injection port (2) is embedded in the middle of the fixed mold base (3), and it is characterized in that, The male mold head (4) includes a housing sleeve with an opening facing the fixed mold base (3) and an overall rectangular box-like structure. Multiple strip-shaped insertion holes (401) distributed in an array are formed at the bottom of the housing sleeve. The same combined air duct (11) is inserted into all the strip-shaped insertion holes (401). The combined air duct (11) includes mold convex rib plates (1101) inserted in the strip-shaped insertion holes (401) and parallel to each other. The same U-shaped pipe penetrates through the sides of all the mold convex rib plates (1101). A first mold groove (501) adapted to the shape of the end of the mold convex rib plate (1101) is reserved on one side of the female mold (5) close to the male mold head (4). Injection holes (402) are formed at the bottom of the housing sleeve of the male mold head (4) close to the end of each strip-shaped insertion hole (401). All the injection holes (402) are close to the middle and symmetrically distributed. The same dendritic jet pipe (18) is inserted into all the injection holes (402). The jet pipe (18) includes a feed main pipe and multiple symmetric branch pipes. The feed main pipe is slidably sleeved on the circumferential outer wall of the injection port (2). A spiral heating rod (1001) is wound around the outer wall of the branch pipe of the jet pipe (18). A fixed panel (1) is fixed between the opening of the housing sleeve and the fixed mold base (3). An installation round hole (103) for the feed main pipe to pass through is formed in the middle of the fixed panel (1). A receiving sleeve (23) is sleeved and fixed at one end of the feed main pipe of the jet pipe (18) close to the installation round hole (103). The overall shape of the receiving sleeve (23) is a horn-like structure. The injection port (2) includes a thin pipe section and a thick pipe section. The thin pipe section of the injection port (2) is always slidably inserted into the circumferential inner wall of the feed main pipe. Guide slide rods (13) are fixed at four corners on one side of the fixed panel (1) close to the fixed mold base (3). The guide slide rods (13) are perpendicular to the fixed panel (1). Spring sink grooves (301) are formed at four corners on one side of the fixed mold base (3) close to the fixed panel (1). Slide insertion holes that form a sliding fit with the guide slide rods (13) are formed at the bottom of the spring sink grooves (301). A return spring (12) is fixed between the bottom of each spring sink groove (301) and the fixed panel (1).

2. The low-pressure injection mold for an automotive handle according to claim 1, wherein, An electric heater (10) is fixedly connected to the middle of one side of the housing sleeve of the male mold head (4) away from the air inlet of the combined air duct (11). The output end of the electric heater (10) is electrically connected to the spiral heating rod (1001).

3. The low-pressure injection mold for an automobile handle according to claim 2, characterized in that, An unloading mechanism is provided inside each of the die convex rib plates (1101) of the combined air duct (11). An embedding groove is formed in the middle of the side of each die convex rib plate (1101) close to the female die (5), and an anti-twist perforation is formed at the bottom of the embedding groove. The unloading mechanism includes a guiding frame (24) fixed inside the die convex rib plate (1101) close to the anti-twist perforation, and a blanking ejector rod (19) is slidably connected in the guiding frame (24); one end of the blanking ejector rod (19) close to the female die (5) is flush with the end of the die convex rib plate (1101); a bearing installation hole coaxial with the blanking ejector rod (19) is formed in the side of the combined air duct (11) away from the embedding groove, a sliding bearing is embedded in the bearing installation hole, a sliding ejector rod (26) is slidably connected in the sliding bearing, a connection disk is reserved at one end of the sliding ejector rod (26) close to the blanking ejector rod (19), and a first tightening spring (25) is arranged between the connection disk and the guiding frame (24).

4. The low-pressure injection mold for an automobile handle according to claim 3, characterized in that, A round hole two (101) coaxial with the sliding ejector rod (26) is formed in the fixed panel (1). Fixed pulley frames (27) are fixed on the fixed panel (1) on the side close to the combined air duct (11) and close to the corresponding round hole two (101), and grooved pulleys are rotatably connected in the middle of the fixed pulley frames (27); two parallel rollers (14) are arranged near the middle of the end of the fixed panel (1) close to the fixed die base (3), and bearing seats (20) are arranged at both ends of the rollers (14). All the sliding ejector rods (26) are divided into two columns and are at equal distances from the rollers (14) on their respective sides. Steel wires (22) are wound on each roller (14) in the same direction. The number of steel wires (22) on each roller (14) is the same as the number of the sliding ejector rods (26) in the column on its side. The steel wires (22) pass through the fixed panel (1), then bypass the corresponding fixed pulleys and are fixed to the ends of the corresponding sliding ejector rods (26). A rope fixing block (21) is fixed between the end of the sliding ejector rod (26) and the steel wire (22). That is, when the roller (14) is rotated, all the steel wires (22) wound on it are pulled at the same time. Then, through the turning action of the fixed pulley, an axial pulling force is generated on all the sliding ejector rods (26) in one column, and the purpose of ejecting the finished product of the vehicle handle is realized; driven gears (17) are fixed at the ends of the two rollers (14) away from the electric heater (10), and the two driven gears (17) are symmetric to each other and have a gap; a cross-shaped groove is reserved in the middle of the side of the fixed die base (3) close to the fixed panel (1), and rope holes (102) are formed in the fixed panel (1) close to the winding position of each steel wire (22).

5. The low-pressure injection mold for an automotive handle according to claim 4, wherein A double-sided rack (16) is fixed at the edge of the fixed die base (3) between the two driven gears (17), and the double-sided rack (16) meshes with the two driven gears (17) at the same time.

6. The low-pressure injection mold for an automobile handle according to claim 5, characterized in that, Fixed blocks (15) are fixed at both the front and rear sides of the male mold head (4) near the four corners, and a stripping pull rod (7) is fixed at one end of each fixed block (15) away from the fixed mold base (3). All the stripping pull rods (7) are parallel to each other, and the axis line of the stripping pull rod (7) is perpendicular to the fixed panel (1); the female mold (5) is an overall cuboid box-shaped structure with an internal cavity, and the opening of the female mold (5) is in the opposite direction to the opening direction of the male mold head (4). The moving mold base (9) is hermetically fixed at the opening of the female mold (5), and the area of the moving mold base (9) is larger than the area of the opening of the female mold (5). Through holes (901) are opened at both sides of the moving mold base (9) near the four corners close to the male mold head (4), and the size and position of the through holes (901) are adapted to the corresponding stripping pull rods (7), and the stripping pull rods (7) are slidably connected in the corresponding through holes (901). The total length of the stripping pull rods (7) is greater than twice the total thickness of the female mold (5) and the moving mold base (9) to ensure that enough space is reserved for the finished product to be discharged; a limiting block (8) is fixed at one end of each stripping pull rod (7) away from the male mold head (4), and the diameter of the limiting block (8) is larger than the aperture of the through hole (901).

7. The low-pressure injection mold for an automobile handle according to claim 1, wherein, A traction fixing area is reserved in the middle of the side of the moving mold base (9) away from the female mold (5).

8. A low-pressure injection mold for an automobile handle according to claim 1, characterized in that, Equal-distance distributed first mold grooves (501) are reserved on the side of the female mold (5) close to the male mold head (4), and a plurality of partition plates (502) distributed in a zigzag shape are fixed at the bottom of the grooves of the female mold (5); a water inlet pipe (6) and a water outlet pipe (601) are respectively inserted into the side of the female mold (5) close to the top, and the water inlet pipe (6) passes through a plurality of partition plates (502).

9. The low-pressure injection mold for an automobile handle according to claim 1, wherein The junction of the thin pipe section and the thick pipe section is a tapered pipe. The flare taper of the material receiving sleeve (23) is adapted to the taper of the tapered pipe of the injection port (2), that is, they are completely fitted during injection molding. An annular groove is opened on the circumferential inner wall of the flare of the material receiving sleeve (23), and a high-temperature resistant sealing ring is embedded in the annular groove.

Images