A two-color injection molding die and a production process of a two-color molded part

Abstract

The application discloses a double-color injection molding die, which comprises an upper die and a lower die, guide columns are arranged at four corners of the upper die, guide sleeves matched with the guide columns are arranged at four corners of the lower die, a first die core is fixedly arranged at one end of the lower die close to the upper die, a second die core matched with the first die core is arranged at one end of the upper die close to the lower die, a pushing mechanism is slidably arranged in the first die core, one end of the pushing mechanism away from the first die core is slidably embedded in the lower die, and one end of the guide sleeve away from the guide column is provided with a driving mechanism. Through cooperation of the fixing plate, the ejector rod, the transmission mechanism, the rotating buckle and the sliding block, when the upper die and the lower die are separated, the driving mechanism drives the fixing plate to move towards the upper die, the transmission mechanism drives the ejector rod to move towards the upper die on the fixing plate, when the sliding block cooperates with the rotating buckle, the ejector rod rotates under the gravity of the molded part, so that the molded part can automatically fall off the ejector rod even if the molded part is deep inside, and secondary discharging operation is avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of double-color injection molding, in particular to a double-color injection molding die and a production process of a double-color molded part. BACKGROUND

[0002] Injection molding, also known as injection molding, is a molding method that combines injection and molding. Double-color injection molding refers to the injection molding of a product made of two different materials or different colors. Its advantages are fast production speed, high efficiency, and a wide variety of colors and shapes.

[0003] Chinese Patent Publication No. CN115195025A discloses a double-color injection molding die. By setting the mold structure and injection structure, the single-mold double-color product forming work can be realized by cooperating the use of the movable die, the fixed die, the double-color injection molding mechanism and the pressing mechanism. When the movable die and the fixed die are closed, the double-color injection molding mechanism covers part of the product forming structure, and the pressing mechanism tightly presses the double-color injection molding mechanism against the surface of the product forming structure, so that the injection molding of two materials can be carried out at the same time, thereby realizing the single-mold double-color forming work, simplifying the structure of the double-color injection molding die, reducing the mold cost, and reducing the opening and closing movement of the movable die and the fixed die, improving the production efficiency.

[0004] The above device, in actual use, is pushed out and discharged by spring compression and reset. If the double-color injection molded part is hollow and deep, when the fixed die and the movable die are separated, the spring will push the ejection mechanism to move with the movable die, so that the molded part will directly contact the mold core on the movable die, and the molded part cannot automatically fall off the ejection mechanism, and the molded part needs to be taken down again, which is relatively cumbersome to operate.

[0005] Therefore, it is necessary to provide a double-color injection molding die and a production process of a double-color molded part to solve the above technical problems. SUMMARY

[0006] The purpose of the present application is to provide a double-color injection molding die and a production process of a double-color molded part to solve the problems raised in the background art.

[0007] To achieve the above-mentioned purpose, the present application provides the following technical scheme: a double-color injection molding die, comprising an upper die and a lower die, four corners of the upper die are provided with guide columns, and four corners of the lower die are provided with guide sleeves matched with the guide columns; a first mold core is fixedly arranged at one end of the lower die close to the upper die, a second mold core matched with the first mold core is arranged at one end of the upper die close to the lower die, a pushing mechanism is slidably arranged in the first mold core, one end of the pushing mechanism away from the first mold core is slidably embedded in the lower die, and one end of the guide sleeve away from the guide column is provided with a driving mechanism;

[0008] When the upper die and the lower die are attached, the guide column is inserted into the guide sleeve to push the driving mechanism to move away from the upper die, and then drive the pushing mechanism to shrink in the first die core; when the upper die and the lower die are separated, the guide column is separated from the guide sleeve, the driving mechanism is relatively close to the upper die, and the pushing mechanism is driven to move relative to the upper die.

[0009] As a further scheme of the present application, the upper die is provided with an injection assembly communicated with the second die core, and the second die core is assembled with a partition plate.

[0010] As a further scheme of the present application, the driving mechanism comprises a hollow column, one end of the hollow column close to the lower die is fixedly connected to the end of the lower die away from the upper die and corresponds to the end of the guide sleeve, a circular ring is fixedly connected to one end of the hollow column close to the guide sleeve, a pushing plate is slidably connected to the inner wall of the hollow column away from the circular ring, a first spring is fixedly arranged between the pushing plate and the circular ring, a circular rod is fixedly connected to the center of the pushing plate, a connecting rod is fixedly connected to one end of the circular rod away from the circular ring, and the center of the connecting rod is connected with the pushing mechanism.

[0011] As a further scheme of the present application, the pushing plate and the circular ring are both provided with a one-way valve, when the pushing plate moves away from the circular ring, the one-way valve is opened to make the external gas quickly enter between the pushing plate and the circular ring, so that the pushing plate can normally move in the hollow column, and when the pushing plate relatively approaches the circular ring, the one-way valve is closed, so that the gas between the pushing plate and the circular ring can only be discharged from the circular ring.

[0012] As a further scheme of the present application, the pushing mechanism comprises a second top plate, one end of the second top plate away from the upper die is fixedly connected with a fixed plate, the end of the fixed plate away from the second top plate is fixedly connected with the connecting rod, the second top plate is slidably embedded at one end of the first die core close to the upper die, and the fixed plate is slidably embedded in the inner wall of the lower die and the first die core, and the end of the fixed plate away from the second top plate penetrates through the lower die.

[0013] As a further scheme of the present application, the fixed plate is provided with two groups and is symmetrically arranged along the center of the second top plate, a top rod is slidably arranged between the two groups of fixed plates, a sliding groove is formed in the fixed plate, a rotating buckle is rotatably connected to one end of the fixed plate close to the second top plate, sliding blocks slidably matched with the sliding groove are fixedly connected to the two sides of the top rod, a first top plate is fixedly connected to one end of the top rod close to the second top plate, the top rod slidably penetrates through the center of the second top plate, a transmission mechanism is rotatably arranged at the end of the fixed plate away from the second top plate, and the end of the transmission mechanism away from the first top plate is drivingly connected with the top rod through a pull rope.

[0014] As a further scheme of the present application: the transmission mechanism comprises a winding shaft; one end of the winding shaft is transmissionally connected with a transmission gear, one side of the transmission gear is engaged with a rack, one side of the end of the fixed plate close to the second top plate is fixedly connected with a guide column, the winding shaft is rotationally arranged between the two groups of fixed plates away from the end of the second top plate, the side of the transmission gear away from the winding shaft is rotationally connected on one group of fixed plates, the end of the pull rope away from the top rod is fixedly connected on the winding shaft through the guide column, and the rack is fixedly arranged on the inner side wall of the lower mold.

[0015] As a further scheme of the present application: the transmission gear inner wall is rotationally connected with a movable plate, the winding shaft is fixedly connected with a limiting block corresponding to the outer side wall of the transmission gear, and the movable plate and the limiting block are in sliding fit.

[0016] As a further scheme of the present application: the end of the two groups of fixed plates away from the second top plate is fixedly connected with a baffle, the end of the sliding groove away from the second top plate is slidingly connected with a cross plate, the cross plate and the end of the top rod away from the first top plate are provided with an elastic column, both sides of the cross plate are fixedly provided with a connecting plate, the end of the connecting plate away from the cross plate is rotationally connected with a sliding block, and the cross plate and the baffle are fixedly connected with a second spring.

[0017] A double-color injection molding die and a production process of a double-color molded part, which adopts the double-color injection molding die described in any one of the above, and comprises the following steps:

[0018] S1, the upper mold and the lower mold are respectively installed on a double-color injection molding equipment;

[0019] S2, the first mold core and the second mold core are respectively assembled on the upper mold and the lower mold;

[0020] S3, the injection molding machine is started to make the upper mold and the lower mold close;

[0021] S4, after the closing is completed, the double-color injection molding work is simultaneously performed through the injection molding assembly;

[0022] S5, after the injection molding of the mold is completed, the upper mold and the lower mold are started to open.

[0023] Compared with the prior art, the present application has the beneficial effects that: through the cooperation of the fixed plate, the ejector rod, the transmission mechanism, the rotating buckle and the sliding block, when the upper die and the lower die are separated from the mold, the driving mechanism drives the fixed plate to move upward to the upper die, the transmission mechanism drives the ejector rod to move upward on the fixed plate to the upper die, when the sliding block cooperates with the rotating buckle, under the gravity of the formed part, the ejector rod will rotate, so that the formed part can be automatically separated from the ejector rod even if the formed part is deep inside, avoiding the need for secondary blanking operation, and the driving mechanism slowly drives the pushing mechanism to move and demold when the mold is opened, avoiding unnecessary damage to the formed part caused by the pushing force generated by the rapid movement of the driving mechanism under the action of the spring. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 It is a front three-dimensional structure schematic diagram of the present application.

[0025] Figure 2 It is a middle section structure schematic diagram of the present application.

[0026] Figure 3 It is a structure schematic diagram of the lower die seat of the present application.

[0027] Figure 4 It is a structure schematic diagram of the driving mechanism of the present application.

[0028] Figure 5 It is a structure schematic diagram of the lower die seat side view of the present application.

[0029] Figure 6 It is a structure schematic diagram of the upper die seat of the present application.

[0030] Figure 7 It is a structure schematic diagram of the pushing mechanism of the present application.

[0031] Figure 8 It is a structure schematic diagram of the sliding groove of the present application.

[0032] Figure 9 It is a structure schematic diagram of the rotating mechanism of the present application.

[0033] Figure 10 It is a structure schematic diagram of the rotating buckle of the present application. Figure 9 It is an enlarged schematic diagram of the middle A.

[0034] Figure 11 It is a structure schematic diagram of the rotating buckle of the present application.

[0035] Figure 12 It is a structure schematic diagram of the transmission gear of the present application.

[0036] In the figure: 1, the upper die; 2, the lower die; 3, the injection molding assembly; 4, the hollow column; 5, the first mold core; 6, the first top plate; 7, the push plate; 8, the connecting rod; 9, the fixed plate; 10, the ring; 11, the one-way valve; 12, the round rod; 13, the first spring; 14, the partition plate; 15, the second mold core; 16, the second top plate; 17, the elastic column; 18, the guide column; 19, the pull rope; 20, the ejector rod; 21, the cross plate; 22, the baffle; 23, the second spring; 24, the rack; 25, the winding shaft; 26, the sliding groove; 27, the rotating buckle; 28, the transmission gear; 29, the sliding block; 30, the connecting plate. DETAILED DESCRIPTION

[0037] Referring to Figures 1-6 In the embodiment of the present application, a two-color injection molding die includes an upper die 1 and a lower die 2. The upper die 1 is provided with guide columns at four corners, and the lower die 2 is provided with guide sleeves matched with the guide columns. When the upper die 1 and the lower die 2 are closed, the guide columns and the guide sleeves make the upper die 1 and the lower die 2 have better stability. The upper die 1 and the lower die 2 are used in cooperation. The lower die 2 is fixedly provided with a first mold core 5 at one end close to the upper die 1. The upper die 1 is provided with a second mold core 15 matched with the first mold core 5 at one end close to the lower die 2. The upper die 1 is provided with an injection molding assembly 3 in communication with the second mold core 15. The second mold core 15 is assembled with a partition plate 14. The injection molding assembly 3 includes a first gate sleeve and a second gate sleeve. The first gate sleeve and the second gate sleeve are sequentially arranged in the upper die 1, and the distal ends thereof are in communication with the second mold core 15. The distal end of the second gate sleeve is matched with the partition plate 14. In this way, after the upper die 1 and the lower die 2 are closed, two kinds of plastic with different materials or different colors can be simultaneously injection molded. The first mold core 5 is slidably provided with a push mechanism. The end of the push mechanism away from the first mold core 5 is slidably embedded in the lower die 2. The end of the guide sleeve away from the guide column is provided with a driving mechanism. When the upper die 1 and the lower die 2 are closed, the driving mechanism is relatively away from the upper die 1 by the guide column extending into the guide sleeve. In turn, the driving mechanism drives the push mechanism to retract in the first mold core 5. When the upper die 1 and the lower die 2 are separated, the guide column and the guide sleeve are separated, and the driving mechanism is relatively close to the upper die 1, driving the push mechanism to move relative to the upper die 1.

[0038] Referring to Figures 4-5, the driving mechanism includes a hollow column 4; hollow column 4 is fixedly connected to the lower die 2 far from the lower die 2 end of the upper die 1, and with the end of the guide sleeve, hollow column 4 is fixedly connected with a ring 10 in the hollow column 4 near the end of the guide sleeve, the inner wall of the hollow column 4 away from the ring 10 is slidably connected with a push plate 7, the first spring 13 is fixedly arranged between the push plate 7 and the ring 10, the push plate 7 can seal sliding in the hollow column 4, the center of the push plate 7 is fixedly connected with a round rod 12, when the upper die 1 and the lower die 2 are adhered, the guide column is inserted into the guide sleeve to push the round rod 12 away from the upper die 1, so that the four groups of round rods 12 move synchronously, at this time, the push plate 7 is relatively away from the ring 10, and the first spring 13 is stretched, when the upper die 1 and the lower die 2 are separated, the push plate 7 is moved relative to the ring 10 by the reset of the first spring 13, the push plate 7 moves to drive the four groups of round rods 12 to move synchronously, the inner diameter of the ring 10 is a circular hole slightly larger than the diameter of the round rod 12, so that when the push plate 7 moves towards the ring 10, the gas between the ring 10 and the push plate 7 is discharged through the circular hole, so that the push plate 7 slowly approaches the ring 10, so as to prevent the push plate 7 from rapidly approaching the ring 10 under the action of the first spring 13, the end of the round rod 12 away from the ring 10 is fixedly connected with a connecting rod 8, the center of the connecting rod 8 is connected with the push mechanism, when the push plate 7 approaches the ring 10, the connecting rod 8 is moved by the synchronously moving round rod 12, so that the push mechanism moves slowly relative to the upper die 1, the molded part after injection molding is pushed out from the first die core 5, the demolding is completed, and the rapid movement of the push mechanism is avoided, so that the instantaneous stress generated by the rapid movement causes the deformation of the injection molded part, resulting in an increase in the defective rate.

[0039] Further, the push plate 7 is provided with a one-way valve 11, and the one-way valve 11 is also provided on the ring 10. The one-way valve 11 can be provided with multiple groups. When the push plate 7 is away from the ring 10, the one-way valve 11 is opened to enable external gas to quickly enter between the push plate 7 and the ring 10, so that the push plate 7 can normally move in the hollow column 4. When the push plate 7 is relatively close to the ring 10, the one-way valve 11 is closed, so that the gas between the push plate 7 and the ring 10 can only be discharged from the circular hole in the center of the ring 10. Since the inner diameter of the circular hole on the ring 10 is slightly larger than the diameter of the round rod 12, the instantaneous discharge amount of the gas is reduced, so that the push plate 7 moves slowly relative to the ring 10.

[0040] Please refer to Figure 3 , Figures 7-8The pushing mechanism comprises a second top plate 16; a fixed plate 9 is fixedly connected to one end of the second top plate 16 away from the upper mold 1, one end of the fixed plate 9 away from the second top plate 16 is fixedly connected with the connecting rod 8, the second top plate 16 is slidingly embedded at one end of the first mold core 5 close to the upper mold 1, the fixed plate 9 is slidingly embedded in the inner wall of the lower mold 2 and the first mold core 5, and one end of the fixed plate 9 away from the second top plate 16 penetrates through the lower mold 2; when the upper mold 1 and the lower mold 2 are closed, through the cooperation of the guide column and the guide sleeve, the guide column pushes the circular rod 12 to move relatively away from the upper mold 1 to the end of the hollow column 4, the movement of the circular rod 12 drives the pushing plate 7 to move relatively away from the circular ring 10 in the hollow column 4, at this time the one-way valve 11 is opened, the gas in the guide sleeve is extruded into the hollow column 4 by the guide column, so that the air pressure between the pushing plate 7 and the circular ring 10 is stable, the first spring 13 is in a stretched state, and the movement of the circular rod 12 also pushes the connecting rod 8 to move relatively away from the lower mold 2, the movement of the connecting rod 8 drives the fixed plate 9 to move relatively and shrink in the first mold core 5, when the upper mold 1 and the lower mold 2 are closed, the partition plate 14 is closed with the first mold core 5, so that the double-color injection molding assembly 3 can be started to work, after the double-color injection molding is completed, the upper mold 1 and the lower mold 2 are separated, the guide column and the guide sleeve are separated, since the position of the circular ring 10 is fixedly arranged, the first spring 13 is reset to drive the pushing plate 7 to move relatively close to the circular ring 10, the movement of the pushing plate 7 through the circular rod 12 drives the connecting rod 8 to move relatively close to the lower mold 2, and then the connecting rod 8 pushes the fixed plate 9 to move relatively close to the upper mold 1, the movement of the fixed plate 9 pushes the second top plate 16 to move relatively close to the upper mold 1, and the movement of the second top plate 16 pushes the injection molded part on the first mold core 5 to be ejected, so that the automatic demolding effect is achieved, and the operation process is simple.

[0041] Please refer to Figures 7-9 、 Figure 11When the inside of the double-color injection molded part is deep, the push mechanism is prone to demolding. When the inside of the molded part is deep, such as barrel-shaped, hollow-shaped structure, etc., the molded part is prone to being hung on the second top plate 16 and the fixed plate 9 during ejection demolding by the cooperation of the second top plate 16 and the fixed plate 9, which cannot be automatically demolded and discharged, affecting the subsequent mold closing injection work. The fixed plate 9 is provided with two groups and is symmetrically arranged along the center of the second top plate 16. The top rod 20 is slidingly arranged between the two groups of fixed plates 9. The sliding groove 26 is formed in the fixed plate 9. The rotating buckle 27 is rotatably connected to one end of the fixed plate 9 close to the second top plate 16. The rotating buckle 27 is rotatably connected between the inner wall of the fixed plate 9 and the side away from the sliding groove 26 by a torsional spring. The recess is formed in the rotating buckle 27, and the width of the recess is the same as that of the sliding groove 26. When the rotating buckle 27 is not matched with the sliding block 29, the opening direction of the recess on the rotating buckle 27 corresponds to the sliding groove 26. The sliding block 29 slidingly matched with the sliding groove 26 is fixedly connected to the two sides of the top rod 20. The size of the recess and the sliding block 29 is matched. The first top plate 6 is fixedly connected to one end of the top rod 20 close to the second top plate 16. The size of the first top plate 6 is the same as that of the second top plate 16. The top rod 20 slidingly penetrates the center of the second top plate 16. The transmission mechanism is rotatably arranged at one end of the fixed plate 9 away from the second top plate 16. The transmission mechanism is drivingly connected to the end of the top rod 20 away from the first top plate 6 by the pull rope 19.

[0042] In specific use, when the upper mold 1 and the lower mold 2 are attached, and the double-color injection molding work is completed by the injection molding assembly 3, the first top plate 6 is retracted in the first mold core 5, and the end face of the first top plate 6 is flush with the end face of the first mold core 5, so as not to affect the injection molding work. The first top plate 6 is attached to the second top plate 16, and the top rod 20 is retracted in the fixed plate 9. When the upper mold 1 and the lower mold 2 are separated, the driving mechanism is relatively moved close to the upper mold 1 by the cooperation of the guide column and the guide sleeve, so as to relatively move the fixed plate 9 close to the upper mold 1. The fixed plate 9 moves to push the first top plate 6 to relatively move close to the upper mold 1 through the second top plate 16, so as to eject the molded part from the first mold core 5. At this time, the fixed plate 9 is relatively moved close to the upper mold 1, the top rod 20 is moved to the upper mold 1 on the fixed plate 9 by the cooperation of the transmission mechanism and the pull rope 19, the first top plate 6 is separated from the second top plate 16, and when the sliding block 29 at the end of the top rod 20 moves in the sliding groove 26 to the recess on the rotating buckle 27, the top rod 20 is rotated by the cooperation of the rotating buckle 27 under the action of the gravity of the molded part itself, so as to automatically fall off the first top plate 6, avoiding the problem that the molded part is easily hung on the first top plate 6 when the inside of the injection molded part is deep.

[0043] Please refer to Figures 9-10 , Figure 12The transmission mechanism comprises a winding shaft 25; one end of the winding shaft 25 is in transmission connection with a transmission gear 28, the side, away from the winding shaft 25, of the transmission gear 28 is in rotation connection with a group of fixed plates 9, one side of the transmission gear 28 is in engagement with a rack 24, the length of the rack 24 is fixed, when the sliding block 29 cooperates with the rotating buckle 27, the transmission gear 28 is separated from the rack 24, so that when the ejector rod 20 rotates under the cooperation of the rotating buckle 27 and the sliding block 29, the ejector rod 20 cannot rotate due to the pulling rope 19, through the engagement of the transmission gear 28 and the rack 24, when the fixed plate 9 moves upwards to the upper die 1, the rotation of the transmission gear 28 drives the winding shaft 25 to rotate to wind the pulling rope 19 on the winding shaft 25, and then drives the ejector rod 20 to move upwards to the upper die 1 in the fixed plate 9, the transmission gear 28 rotates concentrically with the winding shaft 25, the inner wall of the transmission gear 28 is in rotation connection with a movable plate, the outer side wall, opposite to the winding shaft 25, of the transmission gear 28 is fixedly connected with a limiting block, the movable plate and the limiting block are in sliding cooperation, through the cooperation of the movable plate and the limiting block, the transmission gear 28 can only drive the winding shaft 25 to rotate when the fixed plate 9 moves upwards to the upper die 1, so as to avoid that when the fixed plate 9 moves away from the upper die 1, the transmission gear 28 still drives the winding shaft 25 to rotate to wind, which causes that the first top plate 6 cannot be attached to the second top plate 16 and retracted in the first core pin 5, one side of the end, close to the second top plate 16, of the fixed plate 9 is fixedly connected with a guide column 18, the guide column 18 provides a guide for the pulling rope 19, and the section of the guide column 18 between the two fixed plates 9 is in a cylindrical structure, so as to reduce the abrasion of the pulling rope 19, the winding shaft 25 is rotationally arranged between the ends, away from the second top plate 16, of the two groups of fixed plates 9, one end of the pulling rope 19, away from the ejector rod 20, is fixedly connected with the winding shaft 25 through the guide column 18, and the rack 24 is fixedly arranged on the inner side wall of the lower die 2.

[0044] Preferably, the movable plate can be provided with a plurality of groups, the rotation connection position of the transmission gear 28 and the movable plate is provided with a torsion spring, so that the end of the movable plate, close to the winding shaft 25, is always in sliding cooperation with the limiting block under the action of the torsion spring, the limiting block is in a right triangle structure, and the bottom side, corresponding to the right angle, is fixedly connected with the outer side wall of the winding shaft 25, and the plurality of limiting blocks must be arranged in the same direction along the axis of the winding shaft 25, when the transmission gear 28 moves horizontally relative to the upper die 1, the end of the movable plate and the vertical side of the limiting block conflict with each other, so that the transmission gear 28 drives the winding shaft 25 to rotate when the transmission gear 28 is in engagement with the rack 24, when the transmission gear 28 moves horizontally away from the upper die 1, although the transmission gear 28 is still in engagement with the rack 24, but due to the inclined surface sliding cooperation between the movable plate and the limiting block, the transmission gear 28 cannot drive the winding shaft 25 to rotate.

[0045] Please refer to Figure 7 , Figure 9, in order to make the ejector rod 20 rotate after the subsequent mold injection work, so in the two groups of fixed plate 9 between the second fixed plate 16 away from one end of the fixed connection has a baffle 22, the sliding groove 26 away from the second fixed plate 16 one end of the sliding connection has a cross plate 21, cross plate 21 and the ejector rod 20 away from the first fixed plate 6 between the one end of the elastic column 17, the cross plate 21 both sides are fixedly provided with a connecting plate 30, the connecting plate 30 away from the cross plate 21 one end with the sliding block 29 rotationally connected, cross plate 21 and baffle 22 between the fixed connection has a second spring 23.

[0046] Specific use, when the upper die 1 and the lower die 2 are separated, the fixed plate 9 is moved to the upper die 1 by the driving mechanism, the transmission gear 28 is rotated under the action of the rack 24, and then the winding shaft 25 is rotated to wind the pull rope 19, the pull rope 19 is pulled to the upper die 1 under the action of the guide column 18, the ejector rod 20 is moved to the upper die 1 under the cooperation of the sliding groove 26 and the sliding block 29, the cross plate 21 is moved to follow the ejector rod 20 under the guidance of the sliding groove 26 through the connecting plate 30, the cross plate 21 moves to stretch the second spring 23, when the sliding block 29 moves to the recess on the rotating buckle 27, at this time the ejector rod 20 and the sliding block 29 exist the condition of rotation, the ejector rod 20 is rotated under the action of the gravity of the molded part, the elastic column 17 is stretched under the force, so that the molded part is automatically separated from the first fixed plate 6 and the ejector rod 20, and because the transmission gear 28 is separated from the rack 24, the ejector rod 20 is rotated and reset to the horizontal state under the joint action of the elastic column 17 and the torsional spring on the rotating buckle 27, then the second spring 23 resets to pull the cross plate 21 to move to the baffle 22, the cross plate 21 moves to make the ejector rod 20 move to the baffle 22 through the cooperation of the connecting plate 30 and the sliding block 29 and shrink in the fixed plate 9, the first fixed plate 6 and the second fixed plate 16 are attached, and the pull rope 19 is completely spread from the winding shaft 25, the setting of the ejector rod 20 and the fixed plate 9 makes the injection molded part realize the effect of automatic demolding and discharging even if the inside is deeper, and the setting of the baffle 22, the second spring 23 and the cross plate 21 makes the ejector rod 20 automatically reset, avoiding affecting the subsequent injection work.

[0047] Based on the above structure, a double-color injection molding mold and a double-color molding production process, including the following steps: S1, the upper die 1 and the lower die 2 are respectively installed on the double-color injection equipment; S2, the first mold core 5 and the second mold core 15 are respectively assembled on the upper die 1 and the lower die 2; S3, start the injection molding machine to make the upper die 1 and the lower die 2 close; S4, after the mold is closed, the double-color injection work is carried out at the same time through the injection assembly 3; S5, after the mold is completed, the upper die 1 and the lower die 2 are started to open.

Claims

1. A two-color injection molding die, comprising an upper die and a lower die, wherein guide pillars are provided at the four corners of the upper die, and guide sleeves adapted to the guide pillars are provided at the four corners of the lower die; characterized in that, The lower mold is fixedly provided with a first mold core at one end near the upper mold, and the upper mold is provided with a second mold core that cooperates with the first mold core at one end near the lower mold. A pushing mechanism is slidably provided inside the first mold core, and the end of the pushing mechanism away from the first mold core is slidably embedded in the lower mold. A driving mechanism is provided at one end of the guide sleeve away from the guide post. When the upper and lower molds are in contact, the guide post extends into the guide sleeve and pushes the drive mechanism away from the upper mold, thereby driving the push mechanism to retract into the first mold core. When the upper and lower molds are separated, the guide post separates from the guide sleeve, and the drive mechanism moves closer to the upper mold, causing the push mechanism to move relative to the upper mold. The pushing mechanism includes a second top plate; a fixing plate is fixedly connected to the end of the second top plate away from the upper mold, and the end of the fixing plate away from the second top plate is fixedly connected to the connecting rod of the driving mechanism. The second top plate is slidably embedded in the end of the first mold core near the upper mold, and the fixing plate is slidably embedded in the inner wall of the lower mold and the first mold core, and the end of the fixing plate away from the second top plate passes through the lower mold. Two sets of fixing plates are provided and symmetrically arranged along the center of the second top plate. A top rod is slidably arranged between the two sets of fixing plates. A sliding groove is opened on the fixing plate. A rotating buckle is rotatably connected to the end of the fixing plate near the second top plate. Sliding blocks that are adapted to slide in the sliding groove are fixedly connected to both sides of the top rod. A first top plate is fixedly connected to the end of the top rod near the second top plate. The top rod slides through the center of the second top plate. A transmission mechanism is rotatably arranged at the end of the fixing plate away from the second top plate. The transmission mechanism is connected to the end of the top rod away from the first top plate through a pull rope. When the upper and lower molds separate, the connecting rod of the drive mechanism drives the fixed plate to move relatively closer to the upper mold. Through the cooperation of the transmission mechanism and the pull rope, the ejector rod moves on the fixed plate to the upper mold, and the first ejector plate separates from the second ejector plate. When the slider at the end of the ejector rod moves into the groove on the rotating buckle in the slide groove, the ejector rod rotates under the action of the weight of the molded part, so that the molded part can be automatically dropped off from the first ejector plate.

2. The two-color injection molding die according to claim 1, characterized in that, The upper mold is provided with an injection molding assembly that communicates with the second mold core, and the second mold core is equipped with a partition plate.

3. A two-color injection molding die according to claim 1, characterized in that, The driving mechanism includes a hollow column; one end of the hollow column near the lower mold is fixedly connected to the end of the lower mold away from the upper mold, and corresponds to the end of the guide sleeve; a ring is fixedly connected to the end of the hollow column near the guide sleeve; a push plate is slidably connected to the inner wall of the hollow column away from the ring; a first spring is fixedly arranged between the push plate and the ring; a round rod is fixedly connected to the center of the push plate; a connecting rod is fixedly connected to the end of the round rod away from the ring; and the center of the connecting rod is connected to the pushing mechanism.

4. A two-color injection molding die according to claim 3, characterized in that, Both the push plate and the ring are equipped with one-way valves. When the push plate moves away from the ring, the one-way valve opens, allowing external gas to quickly enter between the push plate and the ring, enabling the push plate to move normally within the hollow column. When the push plate moves relatively close to the ring, the one-way valve closes, allowing the gas between the push plate and the ring to be discharged only through the ring opening on the ring.

5. A two-color injection molding die according to claim 4, characterized in that, The transmission mechanism includes a winding shaft; one end of the winding shaft is connected to a transmission gear, and a rack meshes with one side of the transmission gear; a guide post is fixedly connected to one side of the fixed plate near the second top plate; the winding shaft is rotatably disposed between the ends of the two sets of fixed plates away from the second top plate; the side of the transmission gear away from the winding shaft is rotatably connected to one set of fixed plates; the end of the pull rope away from the push rod passes around the guide post and is fixedly connected to the winding shaft; and the rack is fixedly disposed on the inner side wall of the lower mold.

6. A two-color injection molding die according to claim 5, characterized in that, A movable plate is rotatably connected to the inner wall of the transmission gear, and a limit block is fixedly connected to the outer wall of the winding shaft corresponding to the transmission gear. The movable plate and the limit block are in sliding fit.

7. A two-color injection molding die according to claim 6, characterized in that, A baffle is fixedly connected to the end of the two sets of fixed plates away from the second top plate. A cross plate is slidably connected to the end of the slide groove away from the second top plate. An elastic column is provided between the cross plate and the end of the top rod away from the first top plate. Connecting plates are fixedly provided on both sides of the cross plate. The end of the connecting plate away from the cross plate is rotatably connected to the slider. A second spring is fixedly connected between the cross plate and the baffle.

8. A two-color injection molding die and a manufacturing process for two-color molded parts, characterized in that, The method of using a two-color injection mold as described in any one of claims 1-7 includes the following steps: S1. Install the upper mold and lower mold on the two-color injection molding machine respectively; S2. Assemble the first mold core and the second mold core onto the upper mold and the lower mold respectively; S3. Start the injection molding machine to close the upper and lower molds; S4. After the mold is closed, two-color injection molding is performed simultaneously through the injection molding assembly. S5. After the mold injection is completed, start the upper and lower molds to open the mold.

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