Low-pressure injection mold for automobile manufacturing

Abstract

The invention discloses a low-pressure injection mold for automobile manufacturing, and particularly relates to the technical field of injection molds, the low-pressure injection mold comprises a fixed mold body and a movable mold body, the movable mold body is arranged on one side of the fixed mold body, an ejector rod is arranged in the fixed mold body, a guide column is arranged on one side of the fixed mold body, and the surface of the guide column is slidably connected with the inner wall of the movable mold body; a material injection cavity is formed in one side of the movable mold, a material cutting device is arranged on one side of the movable mold, residual plastic melt in the injection cavity can be separated from plastic melt in the mold cavity through the material cutting device, and the melt is pushed out of the movable mold after being cooled, so that the interior of the mold cavity is filled with the plastic melt more perfectly; and the situation that residual plastic melt in the injection cavity is connected with a formed part in the cavity after being cooled and solidified, so that redundant cylindrical protrusions are formed on the surface of the part and need to be cut off by personnel for the second time is reduced, and the forming quality and the machining efficiency of plastic products are improved.

Description

Technical Field

[0001] The invention relates to the technical field of injection molds, in particular to a low-pressure injection mold for automobile manufacturing. Background Art

[0002] An injection mold is a special tool used in the injection molding process. The heated molten plastic is injected into the mold cavity, and the finished product is obtained after cooling and solidification. Injection molds are widely used in the production of plastic parts and products. They are particularly suitable for mass production of products with complex geometric shapes and high precision requirements, such as automotive parts, electronic housings, home appliances, toys, etc.

[0003] Existing low-pressure injection molds for automobile manufacturing are mostly used to fix the fixed mold and the movable mold on the injection molding machine during use, and then use the driving mechanism on the injection molding machine to drive the movable mold to move towards the fixed mold until the movable mold and the fixed mold are tightly closed to form a closed cavity, and then the plastic particles are put into the injection molding machine for hot melting, and then the molten plastic melt is injected into the injection cavity through the pushing mechanism, and flows into the cavity from the injection cavity. After the plastic melt is cooled and solidified, the mold is separated and the molded parts are taken out, thereby completing the injection molding of the plastic parts.

[0004] However, after the plastic melt is transported into the mold cavity through the injection cavity, some plastic melt will remain inside the injection cavity and connect with the melt inside the mold cavity, resulting in the formation of redundant columnar protrusions on the surface of the part after the melt inside the injection cavity cools and solidifies. This requires personnel to cut off the columnar protrusions formed on the surface of the part, increasing the consumption of manpower and time and affecting the processing efficiency of plastic products. Summary of the invention

[0005] The present invention proposes a low-pressure injection mold for automobile manufacturing to solve the problem that after the plastic melt is transported to the inside of the mold cavity through the injection cavity, part of the plastic melt will remain in the injection cavity and connect with the melt inside the mold cavity, resulting in the formation of redundant columnar protrusions on the surface of the part after the melt inside the injection cavity is cooled and solidified, which requires personnel to cut off the columnar protrusions formed on the surface of the part, increasing the consumption of manpower and time and affecting the processing efficiency of plastic products.

[0006] In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a low-pressure injection mold for automobile manufacturing, comprising a fixed mold and a movable mold, the movable mold is arranged on one side of the fixed mold, a ejector rod is arranged inside the fixed mold, a guide column is arranged on one side of the fixed mold, the surface of the guide column is slidably connected to the inner wall of the movable mold, an injection cavity is arranged on one side of the movable mold, and a cutting device is arranged on one side of the movable mold for separating the melt remaining in the injection cavity from the melt inside the mold cavity by rotating a feed pipe to prevent excess columnar melt after solidification from adhering to the surface of the part.

[0007] The effects achieved by the above components are as follows: first, the fixed mold and the movable mold are fixed on the injection molding machine, and then the driving mechanism on the injection molding machine is used to drive the movable mold to move toward the fixed mold until the movable mold and the fixed mold are tightly closed to form a closed cavity, and then the plastic particles are put into the injection molding machine for hot melting, and then the melted plastic melt is injected into the injection cavity through the pushing mechanism, and flows into the cavity from the injection cavity. After the plastic melt cools and solidifies, the mold is separated and the molded parts are taken out, thereby completing the injection molding of the plastic parts.

[0008] Preferably, the cutting device includes a motor, an auxiliary groove is provided on one side of the movable mold close to the injection cavity, the inner wall of the auxiliary groove is connected to the inner wall of the injection cavity, a discharge hole is provided on one side of the movable mold, the motor is fixedly connected to the inner wall of the auxiliary groove, the output end of the motor is fixedly connected to a hole rod, a cooling device is provided on one side of the hole rod, a hollow rod is fixedly connected to one side of the hole rod, a feed pipe is fixedly connected to one side of the hollow rod, an annular disk is fixedly connected to the inner wall of the auxiliary groove, the feed pipe is arranged inside the annular disk, the surface of the feed pipe is in contact with the inner wall of the annular disk, a first electric telescopic rod corresponding to the position of the discharge hole is provided on one side of the annular disk, and a through hole overlapping the inner wall of the injection cavity is provided on the inner wall of the annular disk.

[0009] The effect achieved by the above components is: by setting the cutting device, when the plastic melt is injected into the cavity through the injection cavity, the feed pipe and the through hole, part of the melt is retained in the feed pipe, and at this time, the motor is started to drive the hole rod and the hollow rod to rotate, so that the hollow rod drives the feed pipe to rotate along the inside of the annular disk, and when the feed pipe rotates to the position where the inner wall and the inner wall of the through hole are separated, the feed pipe takes away the residual melt and separates it from the melt in the cavity, and the melt is retained in the feed pipe under the sealing effect of the annular disk on the opening position of the feed pipe, and when the melt is cooled in the feed pipe After solidification, the motor continues to drive the feed pipe to rotate, so that the feed pipe rotates to a position where the inner wall corresponds to the first electric telescopic rod, and the first electric telescopic rod is started to telescopically move and push out the solidified plastic melt inside the feed pipe, and then push it out into the movable mold through the discharge hole, thereby cutting off and cleaning the melt remaining in the injection cavity, reducing the plastic melt remaining in the injection cavity from being connected to the molded part inside the cavity after cooling and solidification, resulting in the formation of redundant columnar protrusions on the surface of the part and the need for secondary cutting by personnel, thereby improving the molding quality and processing efficiency of plastic products.

[0010] Preferably, a cutting ring is fixedly connected to one side of the feed pipe, the cutting ring is arranged inside the annular disk, the surface of the cutting ring is tightly fitted with the inner wall of the annular disk, and the surface of the cutting ring is larger than the inner wall of the through hole.

[0011] The effect achieved by the above components is: by setting the cutting ring, the cutting ring can cooperate with the movement of the feed pipe to cut off the melt, and at the same time, when the feed pipe rotates to a position away from the through hole, the cutting ring can close the through hole, thereby reducing the melt inside the cavity composed of the movable mold and the fixed mold from flowing out through the through hole.

[0012] Preferably, the end of the hole rod away from the motor is fixedly connected with a sleeve, one side of the annular disk is fixedly connected with a support column, the sleeve is sleeved on the surface of the support column, the surface of the support column is fixedly connected with a plurality of first magnets, the surface of the sleeve is fixedly connected with a cylinder, the inner wall of the cylinder is slidably connected with a spring rod, the other end of the spring rod is fixedly connected to the inner wall of the cylinder, one end of the spring rod is fixedly connected with a knocking block, the end of the spring rod away from the knocking block is fixedly connected with a second magnet, the first magnet and the second magnet are magnetically attracted to each other, and the knocking block corresponds to the position of the feed pipe.

[0013] The effect achieved by the above-mentioned components is as follows: by setting the knocking block, when the feed pipe rotates, the hole rod drives the sleeve to rotate synchronously, so that the sleeve drives the cylinder to rotate, and the cylinder drives the spring rod, the knocking block and the second magnet to rotate; when the second magnet rotates to a position corresponding to the first magnet, the first magnet attracts the second magnet, so that the second magnet moves toward the direction close to the first magnet, and then the knocking block and the spring rod are driven by the second magnet and move toward the support column; when the second magnet rotates to a position separated from the first magnet, under the reaction force of the spring in the spring rod, the spring rod pushes the knocking block to move toward the feed pipe and knock the surface of the feed pipe, so that the knocking block repeatedly knocks the surface of the feed pipe during the rotation of the feed pipe, so that the feed pipe vibrates under the collision action of the knocking block, so that the plastic melt after cooling and solidification inside the feed pipe is separated from the inner wall of the feed pipe under the action of vibration, thereby further improving the demolding efficiency of the plastic melt inside the feed pipe.

[0014] Preferably, a rubber pad is fixedly connected to one side of the cylinder, and the rubber pad is sleeved on the surface of the spring rod. A protrusion is fixedly connected to one side of the feed pipe, and the protrusion corresponds to the position of the knocking block.

[0015] The effects achieved by the above components are: by arranging the rubber pad, the rubber pad can separate the knocking block from the cylinder, reducing the direct collision between the knocking block and the cylinder during the reciprocating movement, causing greater wear on the surface of the cylinder; at the same time, the protrusion can replace the surface of the feed pipe to contact the knocking block, reducing the damage to the surface of the feed pipe caused by the knocking block when it collides with the feed pipe, thereby improving the service life and knock resistance of the feed pipe.

[0016] Preferably, the cooling device includes a liquid storage box filled with coolant, the liquid storage box is sleeved on the surface of the support rod, the liquid storage box is fixedly connected to the sleeve, one side of the liquid storage box is fixedly connected to a pipe, the other end of the pipe is fixedly connected to the hollow rod, the inner wall of the liquid storage box is slidably connected to a piston plate, one side of the piston plate is fixedly connected to a round rod, the surface of the round rod is slidably connected to the inner wall of the liquid storage box, the end of the round rod away from the piston plate is fixedly connected to a pressure plate, the pressure plate is sleeved on the surface of the hole rod, the inner wall of the hole rod is fixedly connected to a second electric telescopic rod, the output end of the second electric telescopic rod is fixedly connected to the pressure plate, the surface of the delivery pipe is fixedly connected to a round cover, the inner wall of the round cover is connected to the inner wall of the hollow rod.

[0017] The effect achieved by the above-mentioned components is as follows: by setting up the cooling device, when the feed pipe brings the plastic melt inside it away from the position of the through hole, the second electric telescopic rod is started, so that the second electric telescopic rod drives the pressure plate to move in the direction close to the liquid storage box, so that the pressure plate cooperates with the round rod to push the piston plate inside the liquid storage box to move, so that the piston plate pushes the coolant inside the liquid storage box into the pipeline by squeezing it, so that the coolant is pushed into the hollow rod through the pipeline, and then enters the round cover through the hollow rod, so that the coolant is fully in contact with the surface of the feed pipe inside the round cover, thereby reducing the temperature of the feed pipe, thereby achieving auxiliary cooling of the plastic melt inside the feed pipe, reducing the situation where the temperature of the plastic melt is high and the plastic melt is cooled for a long time inside the feed pipe, and improving the cooling efficiency and material removal effect of excess plastic melt inside the feed pipe.

[0018] Preferably, a plurality of reinforcing ribs are provided on the surface of the circular cover, the plurality of reinforcing ribs are arranged at equal distances, and the reinforcing ribs are made of aluminum.

[0019] The effect achieved by the above components is: by setting reinforcing ribs, the reinforcing ribs can increase the strength of the circular cover itself and reduce the deformation or breakage of the circular cover during use. At the same time, the characteristics of aluminum material can be used to accelerate heat conduction, increase heat volatilization, and further improve cooling efficiency.

[0020] Preferably, a circular ring is provided on the surface fixing sleeve of the pipe, and a reinforcement ring is fixedly connected to one side of the circular ring.

[0021] The effect achieved by the above components is: by setting the circular ring and the reinforcement ring, the circular ring cooperates with the reinforcement ring to connect multiple pipes together, and provides auxiliary support and limit for multiple pipes, thereby reducing the large shaking and jittering of the pipes during use, causing separation at the connection between the pipe and the hollow rod, and improving the stability of the pipe in use.

[0022] Preferably, a sealing ring is fixedly connected to one side of the liquid storage box close to the round rod, the sealing ring is sleeved on the surface of the round rod, and the inner wall of the sealing ring is in contact with the surface of the round rod.

[0023] The effect achieved by the above components is: by setting the sealing ring, the sealing ring can fill and seal the gap between the round rod and the liquid storage box, thereby reducing the air or coolant inside the liquid storage box from flowing out through the gap between the round rod and the liquid storage box.

[0024] Preferably, a semiconductor refrigeration sheet is provided on the surface of the hollow rod, a cooling end of the semiconductor refrigeration sheet is fixedly connected to the hollow rod, and a heat dissipation fin is connected to the hot end of the semiconductor refrigeration sheet.

[0025] The effect achieved by the above components is: by setting up a semiconductor refrigeration plate, the semiconductor refrigeration plate is formed by laminating a large number of P-type semiconductor and N-type semiconductor grains through an adhesive to form a chip-like structure. When direct current passes through a thermocouple composed of P-type semiconductor and N-type semiconductor materials, due to the energy level difference of the charge carriers in the material, cooling and heat release phenomena are respectively generated at both ends of the thermocouple, so that the temperature of the hollow rod in contact with the cold end of the semiconductor refrigeration plate gradually decreases, and the coolant flowing inside the hollow rod is assisted in cooling, thereby achieving secondary cooling of the coolant to improve the cooling effect of the coolant on the plastic melt.

[0026] In summary, the beneficial effects of the present invention are:

[0027] By setting up a cutting device, the plastic melt remaining in the injection cavity can be separated from the plastic melt inside the cavity, and the melt can be pushed out of the moving mold after cooling, so that the plastic melt can fill the cavity more perfectly, reducing the situation where the plastic melt remaining in the injection cavity is connected to the molded part inside the cavity after cooling and solidifying, resulting in the formation of redundant columnar protrusions on the surface of the part and the need for personnel to perform secondary cutting, thereby improving the molding quality and processing efficiency of plastic products.

[0028] By setting up a cooling device, the plastic melt inside the feed pipe can be auxiliary cooled, thereby increasing the cooling rate of the plastic melt inside the feed pipe, reducing the situation where the plastic melt temperature is high and the plastic melt takes a long time to cool inside the feed pipe, thereby improving the cooling efficiency and material removal effect of excess plastic melt inside the feed pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a three-dimensional schematic diagram of the present invention;

[0030] Figure 2 It is a partial cross-sectional view of the movable mold of the present invention;

[0031] Figure 3It is a schematic diagram of the three-dimensional structure of the auxiliary groove of the present invention;

[0032] Figure 4 It is a schematic diagram of the three-dimensional structure of the material conveying pipe of the present invention;

[0033] Figure 5 It is a schematic diagram of the three-dimensional structure of the cutting ring of the present invention;

[0034] Figure 6 It is a schematic diagram of the three-dimensional structure of the annular disk of the present invention;

[0035] Figure 7 The present invention Figure 6 A magnified image of point A;

[0036] Figure 8 It is a three-dimensional structural schematic diagram of the circular cover of the present invention;

[0037] Fig. 9 is a partial cross-sectional view of the liquid storage box of the present invention;

[0038] Fig.10 It is a three-dimensional structural schematic diagram of the pressing plate of the present invention.

[0039] Description of reference numerals:

[0040] 1. Fixed mold; 2. Ejector rod; 3. Guide column; 4. Moving mold; 5. Injection cavity; 6. Cutting device; 61. Auxiliary groove; 62. Discharge hole; 63. Motor; 64. Hole rod; 65. Hollow rod; 66. Feed pipe; 67. Cutting ring; 68. Annular disk; 69. Through hole; 610. First electric telescopic rod; 611. Support column; 612. First magnet; 613. Sleeve; 614. Cylinder ; 615, spring rod; 616, knocking block; 617, second magnet; 618, rubber pad; 619, bump; 7, cooling device; 71, liquid storage box; 72, pipeline; 73, piston plate; 74, round rod; 75, pressure plate; 76, second electric telescopic rod; 77, circular ring; 78, reinforcement ring; 79, sealing ring; 710, round cover; 711, reinforcing rib; 712, semiconductor refrigeration plate. DETAILED DESCRIPTION

[0041] Reference Figure 1-4As shown, this embodiment discloses a low-pressure injection mold for automobile manufacturing, including a fixed mold 1 and a movable mold 4, the movable mold 4 is arranged on one side of the fixed mold 1, a ejector rod 2 is arranged inside the fixed mold 1, a guide column 3 is arranged on one side of the fixed mold 1, the surface of the guide column 3 is slidably connected with the inner wall of the movable mold 4, an injection cavity 5 is arranged on one side of the movable mold 4, and a conveying pipe 66 is arranged on one side of the movable mold 4 to separate the melt remaining in the injection cavity 5 from the melt inside the cavity through the rotation of the conveying pipe 66 to prevent the excess columnar melt after solidification from adhering to the surface of the part. The cutting device 6 first fixes the fixed mold 1 and the movable mold 4 on the injection molding machine, and then uses the driving mechanism on the injection molding machine to drive the movable mold 4 to move towards the fixed mold 1 until the movable mold 4 and the fixed mold 1 are tightly closed to form a closed cavity, and then puts the plastic particles into the injection molding machine for hot melting, and then injects the molten plastic melt into the injection cavity 5 through the pushing mechanism, and flows into the cavity from the injection cavity 5. After the plastic melt is cooled and solidified, the mold is separated and the molded parts are taken out, thereby completing the injection molding of the plastic parts.

[0042] Reference Figure 3-6As shown, this embodiment discloses that the cutting device 6 includes a motor 63, an auxiliary groove 61 is provided on one side of the movable mold 4 close to the injection cavity 5, the inner wall of the auxiliary groove 61 is connected to the inner wall of the injection cavity 5, a discharge hole 62 is provided on one side of the movable mold 4, the motor 63 is fixedly connected to the inner wall of the auxiliary groove 61, the output end of the motor 63 is fixedly connected to a hole rod 64, one side of the hole rod 64 is provided with a cooling device 7, one side of the hole rod 64 is fixedly connected to a hollow rod 65, one side of the hollow rod 65 is fixedly connected to a feeding pipe 66, the inner wall of the auxiliary groove 61 is fixedly connected to the inner wall of the injection cavity 5, the output end of the motor 63 is fixedly connected to a hole rod 64, the cooling device 7 is provided on one side of the hole rod 64, the inner wall of the auxiliary groove 61 is fixedly connected to the inner wall of the auxiliary groove 61, and the inner wall of the auxiliary groove 61 is fixedly connected to the inner wall of the auxiliary groove 61. The wall is fixedly connected with an annular disk 68, and a feeding pipe 66 is arranged inside the annular disk 68. The surface of the feeding pipe 66 is in contact with the inner wall of the annular disk 68. A first electric telescopic rod 610 corresponding to the position of the discharge hole 62 is arranged on one side of the annular disk 68. A through hole 69 which coincides with the inner wall of the injection cavity 5 is opened on the inner wall of the annular disk 68. By setting the cutting device 6, when the plastic melt is injected into the cavity through the injection cavity 5, the feeding pipe 66 and the through hole 69, part of the melt remains in the feeding pipe 66. At this time, the motor 63 is started, so that the motor 63 drives the hole rod 64 and the hollow rod 65 to rotate, so that the hollow rod 65 drives the feed pipe 66 to rotate along the inside of the annular disk 68. When the feed pipe 66 rotates to a position where the inner wall is separated from the inner wall of the through hole 69, the feed pipe 66 takes away the residual melt and separates it from the melt inside the cavity. Under the sealing effect of the annular disk 68 on the opening position of the feed pipe 66, the melt remains inside the feed pipe 66. After the melt is cooled and solidified inside the feed pipe 66, the motor 63 continues to drive the feed pipe 66 to rotate, so that the feed pipe 66 rotates to the inner wall. At the position corresponding to the first electric telescopic rod 610, the first electric telescopic rod 610 is started to telescopically move and push out the solidified plastic melt inside the feed pipe 66, and then push it out into the movable mold 4 through the discharge hole 62, thereby cutting off and cleaning the melt remaining in the injection cavity 5, reducing the plastic melt remaining in the injection cavity 5 from being connected to the molded parts inside the cavity after cooling and solidification, resulting in the formation of redundant columnar protrusions on the surface of the parts and the need for personnel to perform secondary cutting, thereby improving the molding quality and processing efficiency of plastic products.

[0043] Reference Figure 5 and Figure 6 As shown, this embodiment discloses that one side of the feed pipe 66 is fixedly connected with a cutting ring 67, and the cutting ring 67 is arranged inside the annular disk 68. The surface of the cutting ring 67 is tightly fitted with the inner wall of the annular disk 68, and the surface of the cutting ring 67 is larger than the inner wall of the through hole 69. By setting the cutting ring 67, the cutting ring 67 can cooperate with the movement of the feed pipe 66 to cut off the melt. At the same time, when the feed pipe 66 rotates to a position away from the through hole 69, the cutting ring 67 can close the through hole 69, thereby reducing the melt inside the cavity composed of the movable mold 4 and the fixed mold 1 from flowing out through the through hole 69.

[0044] Reference Figure 5 and Figure 6as well as Figure 7 As shown, this embodiment discloses that one end of the hole rod 64 away from the motor 63 is fixedly connected with a sleeve 613, one side of the annular disk 68 is fixedly connected with a support column 611, the sleeve 613 is sleeved on the surface of the support column 611, the surface of the support column 611 is fixedly connected with a plurality of first magnets 612, the surface of the sleeve 613 is fixedly connected with a cylinder 614, the inner wall of the cylinder 614 is slidably connected with a spring rod 615, the other end of the spring rod 615 is fixedly connected to the inner wall of the cylinder 614, one end of the spring rod 615 is fixedly connected with a knocking block 616, the end of the spring rod 615 away from the knocking block 616 is fixedly connected with a second magnet 617, the first magnet 612 is slidably connected with the first magnet 617, and the second magnet 617 is slidably connected with the first magnet 617. The two magnets 617 are magnetically attracted to each other, and the knocking block 616 corresponds to the position of the feeding tube 66. By setting the knocking block 616, when the feeding tube 66 rotates, the hole rod 64 drives the sleeve 613 to rotate synchronously, so that the sleeve 613 drives the cylinder 614 to rotate, and the cylinder 614 drives the spring rod 615, the knocking block 616 and the second magnet 617 to rotate. When the second magnet 617 rotates to a position corresponding to the first magnet 612, the first magnet 612 attracts the second magnet 617, so that the second magnet 617 moves in a direction close to the first magnet 612, and then the knocking block 616 and the spring rod 615 are driven by the second magnet 617 and move toward the first magnet 612. When the second magnet 617 rotates to a position separated from the first magnet 612, the spring rod 615 pushes the knocking block 616 to move toward the direction close to the feed pipe 66 and knock the surface of the feed pipe 66 under the reaction force of the spring in the spring rod 615, so that the knocking block 616 repeatedly knocks the surface of the feed pipe 66 during the rotation of the feed pipe 66, so that the feed pipe 66 vibrates under the collision of the knocking block 616, and the plastic melt cooled and solidified inside the feed pipe 66 is separated from the inner wall of the feed pipe 66 under the action of vibration, thereby further improving the demoulding efficiency of the plastic melt inside the feed pipe 66. Rubber pad 618, rubber pad 618 is sleeved on the surface of spring rod 615, and a protrusion 619 is fixedly connected to one side of delivery tube 66, and the position of protrusion 619 corresponds to the position of knocking block 616. By setting rubber pad 618, rubber pad 618 can separate knocking block 616 from cylinder 614, reduce the direct collision between knocking block 616 and cylinder 614 during reciprocating movement, and cause greater wear on the surface of cylinder 614. At the same time, protrusion 619 can replace the surface of delivery tube 66 to contact with knocking block 616, reduce the damage to the surface of delivery tube 66 caused by knocking block 616 colliding with delivery tube 66, and improve the service life and knock resistance of delivery tube 66.

[0045] Reference Figure 8 and Fig. 9 as well as Fig.10As shown, the present embodiment discloses the cooling device 7 comprises a liquid storage box 71 filled with cooling liquid, the liquid storage box 71 is sleeved on the surface of the supporting rod, the liquid storage box 71 is fixedly connected to the sleeve 613, one side of the liquid storage box 71 is fixedly connected to a pipe 72, the other end of the pipe 72 is fixedly connected to the hollow rod 65, the inner wall of the liquid storage box 71 is slidably connected to a piston plate 73, one side of the piston plate 73 is fixedly connected to a round rod 74, the surface of the round rod 74 is slidably connected to the inner wall of the liquid storage box 71, and one end of the round rod 74 away from the piston plate 73 is fixedly connected to a pressing plate 75, the pressing plate 75 is sleeved on the surface of the hole rod 64, the inner wall of the hole rod 64 is fixedly connected to a second electric telescopic rod 76, the output end of the second electric telescopic rod 76 is fixedly connected to the pressing plate 75, the surface of the feeding pipe 66 is fixedly connected to a round cover 710, the inner wall of the round cover 710 is connected to the inner wall of the hollow rod 65, by setting the cooling device 7, when the feeding pipe 66 When the tube 66 brings the plastic melt inside it away from the position of the through hole 69, the second electric telescopic rod 76 is started, so that the second electric telescopic rod 76 drives the pressure plate 75 to move in the direction close to the liquid storage box 71, so that the pressure plate 75 cooperates with the round rod 74 to push the piston plate 73 inside the liquid storage box 71 to move, so that the piston plate 73 pushes the coolant inside the liquid storage box 71 into the pipe 72 by squeezing it, so that the coolant is pushed into the hollow rod 65 through the pipe 72, and then enters the round cover 710 through the hollow rod 65, so that the coolant is fully in contact with the surface of the feed pipe 66 inside the round cover 710, thereby reducing the temperature of the feed pipe 66, thereby achieving auxiliary cooling of the plastic melt inside the feed pipe 66, reducing the situation where the temperature of the plastic melt is high and the plastic melt is cooled for a long time inside the feed pipe 66, and improving the cooling efficiency and material removal effect of the excess plastic melt inside the feed pipe 66.

[0046] Reference Figure 8 and Fig. 9 as well as Fig.10As shown, the present embodiment discloses that a plurality of reinforcing ribs 711 are arranged at equal distances on the surface of the circular cover 710, and the plurality of reinforcing ribs 711 are made of aluminum. By providing the reinforcing ribs 711, the reinforcing ribs 711 can increase the self-strength of the circular cover 710, reduce the deformation or breakage of the circular cover 710 during use, and at the same time, the characteristics of the aluminum material can be used to accelerate the conduction of heat, improve the volatilization of heat, and further improve the cooling efficiency. A circular ring 77 is fixedly sleeved on the surface of the pipe 72, and a reinforcing ring 78 is fixedly connected to one side of the circular ring 77. By providing the circular ring 77 and the reinforcing ring 78, the circular ring 77 cooperates with the reinforcing ring 78 to connect multiple pipes 72. The sealing ring 79 is arranged on the surface of the round rod 74, and the inner wall of the sealing ring 79 is in contact with the surface of the round rod 74. By setting the sealing ring 79, the sealing ring 79 can fill and seal the gap between the round rod 74 and the liquid storage box 71, thereby reducing the air or coolant inside the liquid storage box 71 from flowing out through the gap between the round rod 74 and the liquid storage box 71.

[0047] Reference Figure 8 As shown, this embodiment discloses that a semiconductor refrigeration sheet 712 is provided on the surface of the hollow rod 65, and the cooling end of the semiconductor refrigeration sheet 712 is fixedly connected to the hollow rod 65, and the hot end of the semiconductor refrigeration sheet 712 is connected to a heat dissipation fin. By setting the semiconductor refrigeration sheet 712, the semiconductor refrigeration sheet 712 is formed by laminating a large number of P-type semiconductor and N-type semiconductor grains through an adhesive to form a chip-like structure. When direct current passes through a thermocouple composed of P-type semiconductor and N-type semiconductor materials, due to the energy level difference of the charge carriers in the material, cooling and heat release phenomena are respectively generated at both ends of the thermocouple, so that the temperature of the hollow rod 65 in contact with the cold end of the semiconductor refrigeration sheet 712 gradually decreases, and the cooling liquid flowing inside the hollow rod 65 is auxiliary cooled, thereby realizing secondary cooling of the cooling liquid, so as to improve the cooling effect of the cooling liquid on the plastic melt.

[0048] The working principle is as follows: first, the fixed mold 1 and the movable mold 4 are fixed on the injection molding machine, and then the driving mechanism on the injection molding machine is used to drive the movable mold 4 to move toward the fixed mold 1 until the movable mold 4 and the fixed mold 1 are tightly closed to form a closed cavity, and then the plastic particles are put into the injection molding machine for hot melting, and then the molten plastic melt is injected into the injection cavity 5 through the pushing mechanism, and flows into the cavity from the injection cavity 5. After the plastic melt is cooled and solidified, the mold is separated and the molded parts are taken out, thereby completing the injection molding of the plastic parts.

[0049] When the plastic melt is injected into the cavity through the injection cavity 5, the feed pipe 66 and the through hole 69, part of the melt remains in the feed pipe 66. At this time, the motor 63 is started, so that the motor 63 drives the hole rod 64 and the hollow rod 65 to rotate, so that the hollow rod 65 drives the feed pipe 66 to rotate along the inside of the annular disk 68. When the feed pipe 66 rotates to the position where the inner wall is separated from the inner wall of the through hole 69, the rotation of the feed pipe 66 is suspended, so that the cutting ring 67 closes the through hole 69, so that the feed pipe 66 takes away the residual melt and separates it from the melt inside the cavity. At the same time, the melt remains in the feed pipe 66 under the sealing effect of the annular disk 68 on the opening position of the feed pipe 66. At this time, the second electric telescopic rod 76 is started, so that the first The second electric telescopic rod 76 drives the pressing plate 75 to move in the direction close to the liquid storage box 71, so that the pressing plate 75 cooperates with the round rod 74 to push the piston plate 73 inside the liquid storage box 71 to move, so that the piston plate 73 pushes the coolant inside the liquid storage box 71 into the pipe 72 by squeezing it, so that the coolant is pushed into the hollow rod 65 through the pipe 72, and then enters the inside of the round cover 710 through the hollow rod 65, so that the coolant is fully in contact with the surface of the feed pipe 66 inside the round cover 710, reducing the temperature of the feed pipe 66, thereby achieving auxiliary cooling of the plastic melt inside the feed pipe 66. When the melt is cooled and solidified inside the feed pipe 66, the motor 63 continues to drive the hole rod 64 and the feed pipe 66 to rotate, so that the hole rod 6 4 drives the sleeve 613 to rotate synchronously, so that the sleeve 613 drives the cylinder 614 to rotate, so that the cylinder 614 drives the spring rod 615, the knocking block 616 and the second magnet 617 to rotate. When the second magnet 617 rotates to a position corresponding to the first magnet 612, the first magnet 612 attracts the second magnet 617, so that the second magnet 617 moves in a direction close to the first magnet 612, and then the knocking block 616 and the spring rod 615 are driven by the second magnet 617 and move in a direction close to the support column 611. When the second magnet 617 rotates to a position separated from the first magnet 612, the spring rod 615 pushes the knocking block 616 under the reaction force of the spring in the spring rod 615. 6 moves in the direction close to the feed pipe 66 and knocks the surface of the feed pipe 66, so that the knocking block 616 repeatedly knocks the surface of the feed pipe 66 during the rotation, so that the feed pipe 66 vibrates under the collision action of the knocking block 616, so that the plastic melt cooled and solidified inside the feed pipe 66 is gradually separated from the inner wall of the feed pipe 66 under the action of vibration; when the feed pipe 66 rotates to the position corresponding to the first electric telescopic rod 610, the first electric telescopic rod 610 is started, so that the first electric telescopic rod 610 pushes out the solidified plastic melt inside the feed pipe 66 through telescopic movement, and then pushes it out into the movable mold 4 through the discharge hole 62, thereby achieving the purpose of cutting, cooling and cleaning the melt remaining in the injection cavity 5.

Claims

1. A low-pressure injection mold for automobile manufacturing, comprising a fixed mold (1) and a movable mold (4), characterized in that: The movable mold (4) is arranged on one side of the fixed mold (1), a ejector rod (2) is arranged inside the fixed mold (1), a guide column (3) is arranged on one side of the fixed mold (1), the surface of the guide column (3) is slidably connected to the inner wall of the movable mold (4), an injection cavity (5) is arranged on one side of the movable mold (4), and a cutting device (6) is arranged on one side of the movable mold (4) for separating the melt remaining in the injection cavity (5) from the melt in the mold cavity by rotating a feed pipe (66) to prevent excess columnar melt after solidification from adhering to the surface of the part.

2. A low-pressure injection mold for automobile manufacturing according to claim 1, characterized in that: The cutting device (6) comprises a motor (63); an auxiliary groove (61) is provided on one side of the movable mold (4) close to the injection cavity (5); the inner wall of the auxiliary groove (61) is connected to the inner wall of the injection cavity (5); a discharge hole (62) is provided on one side of the movable mold (4); the motor (63) is fixedly connected to the inner wall of the auxiliary groove (61); the output end of the motor (63) is fixedly connected to a hole rod (64); a cooling device (7) is provided on one side of the hole rod (64); and one side of the hole rod (64) is fixedly connected to A hollow rod (65) is provided, one side of the hollow rod (65) is fixedly connected to a feed pipe (66), the inner wall of the auxiliary groove (61) is fixedly connected to an annular disk (68), the feed pipe (66) is arranged inside the annular disk (68), the surface of the feed pipe (66) is in contact with the inner wall of the annular disk (68), one side of the annular disk (68) is provided with a first electric telescopic rod (610) corresponding to the position of the discharge hole (62), and the inner wall of the annular disk (68) is provided with a through hole (69) that coincides with the inner wall of the injection cavity (5).

3. A low-pressure injection mold for automobile manufacturing according to claim 2, characterized in that: A cutting ring (67) is fixedly connected to one side of the feed pipe (66). The cutting ring (67) is arranged inside the annular disk (68). The surface of the cutting ring (67) is tightly fitted with the inner wall of the annular disk (68). The surface of the cutting ring (67) is larger than the inner wall of the through hole (69).

4. A low-pressure injection mold for automobile manufacturing according to claim 2, characterized in that: The end of the hole rod (64) away from the motor (63) is fixedly connected to a sleeve (613), one side of the annular disk (68) is fixedly connected to a support column (611), the sleeve (613) is sleeved on the surface of the support column (611), the surface of the support column (611) is fixedly connected to a plurality of first magnets (612), the surface of the sleeve (613) is fixedly connected to a cylinder (614), and the inner wall of the cylinder (614) is slidably connected to the inner wall of the cylinder (614). A spring rod (615) is provided, the other end of the spring rod (615) is fixedly connected to the inner wall of the cylinder (614), one end of the spring rod (615) is fixedly connected to a knocking block (616), one end of the spring rod (615) away from the knocking block (616) is fixedly connected to a second magnet (617), the first magnet (612) and the second magnet (617) are magnetically attracted to each other, and the knocking block (616) corresponds to the position of the conveying pipe (66).

5. A low-pressure injection mold for automobile manufacturing according to claim 4, characterized in that: A rubber pad (618) is fixedly connected to one side of the cylinder (614), and the rubber pad (618) is sleeved on the surface of the spring rod (615). A convex block (619) is fixedly connected to one side of the feed pipe (66), and the position of the convex block (619) corresponds to that of the knocking block (616).

6. A low-pressure injection mold for automobile manufacturing according to claim 4, characterized in that: The cooling device (7) comprises a liquid storage box (71) filled with coolant, the liquid storage box (71) is sleeved on the surface of the support rod, the liquid storage box (71) is fixedly connected to the sleeve (613), one side of the liquid storage box (71) is fixedly connected to a pipe (72), the other end of the pipe (72) is fixedly connected to the hollow rod (65), the inner wall of the liquid storage box (71) is slidably connected to a piston plate (73), one side of the piston plate (73) is fixedly connected to a round rod (74), the surface of the round rod (74) is in contact with the storage box (71), and the liquid storage box (71) is fixedly connected to the support rod (613). The inner wall of the liquid box (71) is slidably connected, and one end of the round rod (74) away from the piston plate (73) is fixedly connected to a pressure plate (75), and the pressure plate (75) is sleeved on the surface of the hole rod (64). The inner wall of the hole rod (64) is fixedly connected to a second electric telescopic rod (76), and the output end of the second electric telescopic rod (76) is fixedly connected to the pressure plate (75). The surface of the feed pipe (66) is fixedly connected to a round cover (710), and the inner wall of the round cover (710) is connected to the inner wall of the hollow rod (65).

7. A low-pressure injection mold for automobile manufacturing according to claim 6, characterized in that: The surface of the circular cover (710) is provided with a plurality of reinforcing ribs (711), the plurality of reinforcing ribs (711) are arranged at equal distances, and the reinforcing ribs (711) are made of aluminum.

8. A low-pressure injection mold for automobile manufacturing according to claim 6, characterized in that: A circular ring (77) is fixedly sleeved on the surface of the pipe (72), and a reinforcement ring (78) is fixedly connected to one side of the circular ring (77).

9. A low-pressure injection mold for automobile manufacturing according to claim 6, characterized in that: A sealing ring (79) is fixedly connected to one side of the liquid storage box (71) close to the round rod (74); the sealing ring (79) is sleeved on the surface of the round rod (74); and the inner wall of the sealing ring (79) is in contact with the surface of the round rod (74).

10. A low-pressure injection mold for automobile manufacturing according to claim 2, characterized in that: A semiconductor cooling sheet (712) is provided on the surface of the hollow rod (65), a cooling end of the semiconductor cooling sheet (712) is fixedly connected to the hollow rod (65), and a heat dissipation fin is connected to the hot end of the semiconductor cooling sheet (712).

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