Injection mold for multi-color injection molded parts and use method

Abstract

The present invention relates to the technical field of plastic part molds, and specifically to an injection mold for multi-color injection molded parts and a method of using the same, comprising four outer protective shells, a mold core arranged in the outer protective shell, a partition plate fixedly installed on the top of the outer protective shell, and a top plate arranged on the top of the outer protective shell. An embedding groove is provided on one side of the top plate. When different colors of injection molding materials are injected into the same position, the top plate can also be rotated to allow the top plate to correspond to injection molding heads at other positions. In this way, there is no need to rotate the structure composed of the outer protective shell, the mold core, the partition plate and the top plate. Only the top plate needs to be rotated to achieve injection molding materials of other colors, thereby reducing the time and operation steps required for the overall rotation of the mold, shortening the production cycle, and thereby being able to produce more injection molded products per unit time, avoiding the greater mechanical wear that may be caused by the overall rotation of the mold, extending the service life of the mold and related equipment, and reducing the cost of maintenance and replacement.

Description

Technical Field

[0001] The invention relates to the technical field of plastic part molds, in particular to an injection mold for multi-color injection molded parts and a use method thereof. Background Art

[0002] The injection mold for multi-color injection molding is a mold specially used for producing multi-color injection molding products.

[0003] When using an injection mold for multi-color injection molded parts, one color of injection material is added to the injection mold through an injection head, and then another color of injection material is injected into the injection mold. The mold as a whole needs to be rotated to rotate the injection hole on the mold to the position of the next injection head, and then another color of injection material is added to the injection mold through the injection head at this position. Large rotation movements can easily cause more serious wear on the mold and related transmission components, shortening the service life of the equipment. At the same time, the time required for the overall rotation of the mold is longer, and the production cycle is also longer. Summary of the invention

[0004] The object of the present invention is to provide an injection mold for multi-color injection molded parts and a method of using the same to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: an injection mold for multi-color injection molded parts and a method of using the same, comprising four outer protective shells, a mold core arranged in the outer protective shells, a partition plate fixedly installed on the top of the outer protective shells, and a top plate arranged on the top of the outer protective shells, one side of the top plate is provided with an embedding groove, the other side of the top plate is provided with an embedding strip, and the embedding strip is movably engaged in the embedding groove on another top plate, the bottoms of the multiple top plates are fixedly connected with a rotating part near the connection position, the bottom of the rotating part is fixedly installed with a limiting part, the rotating part and the limiting part are engaged in the rotating groove opened on the partition plate, the rotating groove is provided with a positioning slot, and the A bottom plate, a spring sheet and a protrusion are arranged at the position of the rotating part corresponding to the positioning slot, and the bottom plate, the spring sheet and the protrusion are arranged parallel to each other, the bottom plate is located at the innermost position of the rotating part, and the protrusion is located at the outermost position of the rotating part, and a docking plate is arranged on the sides of the rotating parts close to each other, and a fixing groove is opened on the docking plate, and the docking plates on the two adjacent rotating parts are staggered, and a fixing strip is clamped and installed in the fixing grooves on the two docking plates that are clamped together, and a mounting seat is arranged at the position of the rotating groove corresponding to the limiting part, and a guide bead is rotatably connected to the mounting seat, and the guide bead is movably engaged in the limiting groove arranged on the outer side wall of the limiting part.

[0006] Preferably, the side of the protrusion close to the positioning slot is adapted to the shape of the positioning slot.

[0007] Preferably, the limiting groove and the guide bead are clearance-fitted.

[0008] Preferably, a telescopic sealing column is movably inserted on the partition plate, and the end of the telescopic sealing column passes through the outer protective shell. An injection liquid inlet hole is opened at the center position of the partition plate, and a mounting sleeve is provided at the position outside the outer protective shell corresponding to the telescopic sealing column. An adjusting bolt is threadedly installed on the mounting sleeve, and a triangular lifting block is also movably installed in the mounting sleeve, and the bottom end of the adjusting bolt is rotatably connected to the triangular lifting block.

[0009] Preferably, two rotating rods are rotatably connected in the partition plate, and the rotating rods are located on both sides of the telescopic sealing column. A flip plate is fixedly installed on the rotating rods, and the flip plate is located on both sides of the telescopic sealing column near the end. A limit plate is also provided in the partition plate, and the position of the limit plate corresponds to that of the flip plate. An arc spring is provided between the flip plate and the limit plate for connection.

[0010] Preferably, a clearance groove is provided at the bottom of the top plate, and the clearance groove is connected to the injection hole on the top plate, a mounting ring is fixedly installed on the injection liquid inlet hole, an elastic flow guide tube is fixedly installed on the top of the mounting ring, and another mounting ring is fixedly installed on the top of the elastic flow guide tube, and the mounting ring is connected to the injection hole on the top plate.

[0011] Preferably, two assembly racks are fixedly installed on the top of the top plate, and the two assembly racks are located on both sides of the injection hole on the top plate, two semi-annular ferrules are slidably connected to the assembly rack, a positioning seat is fixedly installed on the semi-annular ferrule, a limiting sleeve is also fixedly installed on the assembly rack, and the positions of the positioning seat and the limiting sleeve correspond to each other, and a straight spring mounted on the assembly rack is arranged between the positioning seat and the limiting sleeve.

[0012] Preferably, the two semi-annular ferrules on the assembly frame are arranged symmetrically.

[0013] Preferably, an annular band is provided at a position near the top of the inner wall of the semi-annular ferrule, and support balls are also provided on the inner wall of the semi-annular ferrule, and the support balls are distributed in an annular array with the central axis of the semi-annular ferrule as the center of the array.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] 1. After the injection molding of one color of injection molding material is completed, it is necessary to inject other colors of injection molding material into the injection mold. Use the same injection molding head to supply different color pigments and rotate the top plate. When the top plate rotates, the structure composed of the rotating parts and the limiting parts at the bottom of the multiple top plates rotates in the rotating groove. When the rotating part and the limiting part rotate, the structure composed of the mounting seat and the guide bead guides and limits the rotation of the limiting part and the rotating part, and reduces the resistance to the rotation of the rotating part and the limiting part. In the process of rotation of the rotating part, when the protrusion is subjected to the pressure of the side wall of the rotating groove, the protrusion transmits the pressure to the spring sheet, the spring sheet is deformed, and the protrusion retracts into the rotating part. When the rotation angle of the rotating part reaches the protrusion degree, the compressed spring sheet ejects the protrusion and engages in another positioning slot. At the same time, during the rotation of the top plate, the mounting ring is subjected to the pressure during the rotation of the top plate. The tensile force causes the mold to deform and extend, and the extended part will remain in the give way groove, so that injection materials of other colors can enter through the top plates at other positions, and then enter the mounting ring corresponding to the top plate at that position. When different injection heads are used to inject injection materials of different colors into the same position, the top plate can also be rotated to make the top plate correspond to the injection heads at other positions. In this way, there is no need to rotate the structure composed of the outer protective shell, the mold core, the partition plate and the top plate. Only the top plate needs to be rotated to realize injection materials of other colors, which reduces the time and operation steps required for the overall rotation of the mold, shortens the production cycle, and can produce more injection molded products per unit time, avoids the greater mechanical wear that may be caused by the overall rotation of the mold, extends the service life of the mold and related equipment, and reduces the cost of maintenance and replacement.

[0016] 2. According to the needs of different injection molded parts, you can choose to seal the structure composed of the outer protective shell, mold core, partition plate and top plate. The outer protective shell, partition plate and top plate form a membrane shell, and the mold core can be replaced separately to meet the needs of different injection molded parts. The adjusting bolt is adjusted to rise and fall on the mounting sleeve by rotating the adjusting bolt. The lifting and lowering of the adjusting bolt on the mounting sleeve drives the triangular lifting block to rise and fall, so that the triangular lifting block applies pressure to the end of the telescopic sealing column. After the end of the telescopic sealing column is pressurized, the telescopic sealing column will move in the mounting sleeve, and the end of the telescopic sealing column located in the partition plate applies pressure to the two flip plates to push the structure composed of the two flip plates apart. At the same time, after the flip plates are pressed and pushed apart, the flip plates apply pressure to the arc spring, and the arc spring deforms to generate a reverse elastic force that is the same as the subsequent resetting of the flip plates. At the same time, after the end of the telescopic sealing column is engaged in the injection liquid entry hole, the injection liquid entry hole is sealed. According to the needs of different products, specific parts of the mold can be flexibly adjusted to quickly adapt to diverse production tasks without replacing the entire mold, saving time and cost.

[0017] 3. The injection molding head is moved between the two semi-annular ferrules to apply pressure to the semi-annular ferrules. After the semi-annular ferrules are pressurized, they slide on the assembly frame. At the same time, the positioning seat on the semi-annular ferrule will apply pressure to the straight spring, which will be deformed under pressure. The deformation of the straight spring will generate a reverse elastic force for resetting the semi-annular ferrule. At the same time, the pressure-bearing head is located in the semi-annular ferrule and contacts the flip plate and the support ball. The support ball and the flip plate are used to apply pressure to the outer wall of the injection molding head to ensure the fixing effect of the injection molding head in the two semi-annular ferrules, realize the fully automatic fixation of the injection molding head, and improve the convenience of installation and insertion of the injection molding head. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0019] Figure 2 It is a structural schematic diagram of the corresponding position of the mold core of the present invention.

[0020] Figure 3 It is a structural schematic diagram of the corresponding position of the injection liquid entry hole of the present invention.

[0021] Figure 4 It is a schematic diagram of the structure of the elastic flow guide tube at the corresponding position of the present invention.

[0022] Figure 5 It is a structural schematic diagram of the corresponding position of the partition plate of the present invention.

[0023] Figure 6 It is a structural schematic diagram of the corresponding position of the yield groove of the present invention.

[0024] Figure 7 It is a structural schematic diagram of the corresponding position of the triangular lifting block of the present invention.

[0025] Figure 8 It is a schematic diagram of the structure at the corresponding position of the telescopic sealing column of the present invention.

[0026] Fig. 9 It is a structural schematic diagram of the corresponding position of the flip plate of the present invention.

[0027] Fig.10 It is a schematic diagram of the structure at the corresponding position of the limiting sleeve of the present invention.

[0028] Fig.11 It is a structural schematic diagram of the corresponding position of the positioning seat of the present invention.

[0029] Fig.12 It is a schematic diagram of the structure at the corresponding position of the bump of the present invention.

[0030] Fig.13 It is a schematic diagram of the structure at the corresponding position of the guide bead of the present invention.

[0031] Fig.14It is a schematic diagram of the structure at the corresponding position of the spring piece of the present invention.

[0032] Fig.15 It is a structural schematic diagram of the corresponding position of the rotating groove of the present invention.

[0033] In the figure: 1. outer protective shell; 2. mold core; 3. partition plate; 301. rotating groove; 302. positioning card slot; 303. injection liquid entry hole; 4. top plate; 401. embedding groove; 402. embedding strip; 403. clearance groove; 5. rotating part; 6. limiting part; 601. limiting groove; 7. bottom plate; 8. spring; 9. bump; 10. docking plate; 11. fixing groove; 12. fixing strip; 13. mounting seat; 14. guide bead; 15. telescopic sealing column; 16. mounting sleeve; 17. adjusting bolt; 18. triangular lifting block; 19. rotating rod; 20. flip plate; 21. limiting plate; 22. arc spring; 23. mounting ring; 24. elastic guide tube; 25. assembly frame; 26. semi-annular sleeve; 27. positioning seat; 28. limiting sleeve; 29. ​​straight spring; 30. annular belt; 31. supporting ball. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution in the embodiment of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiment of the present invention. Obviously, the described embodiment is a part of the embodiment of the present invention, not all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] See also Figures 1 to 15The present invention provides a technical solution: an injection mold for multi-color injection molded parts and a method of use, comprising four outer protective shells 1, a mold core 2 arranged in the outer protective shell 1, a partition plate 3 fixedly installed on the top of the outer protective shell 1, and a top plate 4 arranged on the top of the outer protective shell 1, the injection mold is composed of four outer protective shells 1, the mold core 2, the partition plate 3 and the top plate 4, and the four outer protective shells 1, the mold core 2, the partition plate 3 and the top plate 4 are arranged in a circular array with the connection position as the array center, and the structure composed of the four outer protective shells 1, the mold core 2, the partition plate 3 and the top plate 4 has the same shape, and the structure composed of a single outer protective shell 1, the mold core 2, the partition plate 3 and the top plate 4 can be replaced, thereby improving the use of the structure composed of the outer protective shell 1, the mold core 2, the partition plate 3 and the top plate 4 In order to facilitate use and replacement, an embedding groove 401 is provided on one side of the top plate 4, and an embedding strip 402 is provided on the other side of the top plate 4, and the embedding strip 402 is movably engaged in the embedding groove 401 on another top plate 4. According to the needs of different injection molding parts, the structure composed of the outer protective shell 1, the mold core 2, the partition plate 3 and the top plate 4 can be selected to be used alone, or the structure composed of two outer protective shells 1, the mold core 2, the partition plate 3 and the top plate 4 can be assembled together. According to the needs of different injection molding parts, the bottoms of multiple top plates 4 are fixedly connected with a rotating part 5 near the connecting position, and the bottom of the rotating part 5 is fixedly installed with a limiting part 6. The size of the limiting part 6 is larger than the size of the rotating part 5. The engagement of the limiting part 6 in the rotating groove 301 ensures that the top plate 4 constitutes the structure When rotating, the top plate 4 will not fall off, and the rotating part 5 and the limiting part 6 are engaged in the rotating groove 301 provided on the partition plate 3. The rotating groove 301 is composed of two parts, one part adapts to the formation of the rotating part 5, and the other part adapts to the formation of the limiting part 6, ensuring that the rotating part 5 and the limiting part 6 form a structure that rotates in the rotating groove 301. A positioning groove 302 is provided on the rotating groove 301, and the side of the protrusion 9 close to the positioning groove 302 is adapted to the shape of the positioning groove 302. The shape of the protrusion 9 and the positioning groove 302 is adapted to ensure that the protrusion 9 is engaged in the positioning groove 302. A bottom plate 7, a spring piece 8 and a protrusion 9 are provided at the position of the rotating part 5 corresponding to the positioning groove 302, and the bottom plate 7, the spring piece 8 and the protrusion 9 are arranged parallel to each other, and the bottom plate 7 is located at The protrusion 9 is located at the innermost position of the rotating part 5, and the protrusion 9 is located at the outermost position of the rotating part 5. A docking plate 10 is provided on the side where the rotating parts 5 are close to each other. A fixing groove 11 is provided on the docking plate 10, and the docking plates 10 on the two adjacent rotating parts 5 are staggered. A fixing strip 12 is installed in the fixing groove 11 on the two docking plates 10 that are clamped together. A guiding inclined surface is provided on the docking plate 10 to ensure that when the two rotating parts 5 cooperate with each other, the docking plate 10 can be clamped on the other rotating part 5, so that the two docking plates 10 fit each other, and after the fixing strip 12 is clamped in the fixing groove 11, the two rotating parts 5 can no longer be separated, so that the connection and fixation between the two rotating parts 5 are achieved. A mounting seat 13 is provided at the position of the rotating groove 301 corresponding to the limiting part 6.A guide bead 14 is rotatably connected to the mounting seat 13, and the guide bead 14 is movably engaged in the limit groove 601 provided on the outer wall of the limit part 6. The limit groove 601 and the guide bead 14 are clearance-matched. The guide bead 14 limits and guides the rotation of the limit part 6, thereby reducing the resistance to the rotation of the limit part 6 and the rotating part 5.

[0036] A telescopic sealing column 15 is movably inserted on the partition plate 3, and the end of the telescopic sealing column 15 passes through the outer protective shell 1. An injection liquid inlet hole 303 is opened at the center of the partition plate 3. A mounting sleeve 16 is arranged at the position of the telescopic sealing column 15 outside the outer protective shell 1. An adjusting bolt 17 is threadedly installed on the mounting sleeve 16. A triangular lifting block 18 is also movably installed in the mounting sleeve 16. The positions of the telescopic sealing column 15 and the triangular lifting block 18 correspond to each other, and the sides close to the telescopic sealing column 15 and the triangular lifting block 18 are inclined, and the bottom end of the adjusting bolt 17 is rotatably connected to the triangular lifting block 18. The triangular lifting block 18 is pressed by the rotation of the adjusting bolt 17, thereby driving the triangular lifting block 18 to move downward, and pushing the telescopic sealing column 15 to move into the partition plate 3.

[0037] Two rotating rods 19 are rotatably connected inside the partition plate 3, and the rotating rods 19 are located on both sides of the telescopic sealing column 15. A flip plate 20 is fixedly installed on the rotating rods 19, and the flip plate 20 is located on both sides of the telescopic sealing column 15 near the end. The inner wall of the flip plate 20 is adapted to the shape of the injection liquid inlet hole 303 to form a sealed annular structure. A limit plate 21 is also provided in the partition plate 3, and the position of the limit plate 21 corresponds to the flip plate 20. The limit plate 21 limits the movement of the flip plate 20. An arc spring 22 is provided between the flip plate 20 and the limit plate 21 for connection. The elasticity of the arc spring 22 is used to apply pressure to the movement of the flip plate 20 to generate a reverse elastic force for resetting the flip plate 20.

[0038] A clearance groove 403 is provided at the bottom of the top plate 4, and the clearance groove 403 is connected to the injection hole on the top plate 4. A mounting ring 23 is fixedly installed on the injection liquid inlet hole 303, and an elastic flow guide tube 24 is fixedly installed on the top of the mounting ring 23. Another mounting ring 23 is also fixedly installed on the top of the elastic flow guide tube 24, and the mounting ring 23 is connected to the injection hole on the top plate 4. When the top plate 4 rotates, the mounting ring 23 will be deformed, and the mounting ring 23 moves in the clearance groove 403 to adapt to the rotation of the top plate 4.

[0039] Two assembly racks 25 are fixedly installed on the top of the top plate 4, and the two assembly racks 25 are located on both sides of the injection hole on the top plate 4. Two semi-annular ferrules 26 are slidably connected to the assembly rack 25. The two semi-annular ferrules 26 located on the assembly rack 25 are symmetrically arranged. The semi-annular ferrules 26 move on the assembly rack 25, and the movement of the semi-annular ferrules 26 is guided and limited by the assembly rack 25. A positioning seat 27 is fixedly installed on the semi-annular ferrule 26, and a limiting sleeve 28 is also fixedly installed on the assembly rack 25, and the positions of the positioning seat 27 and the limiting sleeve 28 correspond to each other. A straight spring 29 mounted on the assembly rack 25 is arranged between the positioning seat 27 and the limiting sleeve 28.

[0040] An annular belt 30 is provided near the top of the inner wall of the semi-annular ferrule 26 . Support balls 31 are also provided on the inner wall of the semi-annular ferrule 26 . The support balls 31 are distributed in an annular array with the central axis of the semi-annular ferrule 26 as the center of the array.

[0041] Working principle:

[0042] Step 1: According to the needs of different injection molded parts, you can choose to connect the structure consisting of two outer protective shells 1, core 2, partition plate 3 and top plate 4 together. During assembly, the embedding strip 402 on the top plate 4 is snapped into the embedding groove 401 on the other top plate 4, and the connection position of the embedding strip 402 and the embedding groove 401 is fixed by bolts to ensure the stability of the structural connection consisting of the two outer protective shells 1, core 2, partition plate 3 and top plate 4.

[0043] Step 2: According to the needs of different injection molded parts, the structure composed of the outer protective shell 1, the mold core 2, the partition plate 3 and the top plate 4 can be selected for sealing. The outer protective shell 1, the partition plate 3 and the top plate 4 form a membrane shell, and the mold core 2 can be replaced separately to meet the needs of different injection molded parts. The adjusting bolt 17 is rotated to make the adjusting bolt 17 rise and fall on the mounting sleeve 16. The lifting and lowering of the adjusting bolt 17 on the mounting sleeve 16 drives the triangular lifting block 18 to rise and fall, so that the triangular lifting block 18 applies pressure to the end of the telescopic sealing column 15. After the end of the telescopic sealing column 15 is pressurized, the telescopic sealing column 15 It will move in the installation sleeve 16, and the end of the telescopic sealing column 15 located in the partition plate 3 applies pressure to the two flip plates 20 to push the structure composed of the two flip plates 20 apart. At the same time, after the flip plates 20 are pressed and pushed apart, the flip plates 20 apply pressure to the arc spring 22, and the arc spring 22 deforms to generate a reverse elastic force that is the same as the subsequent resetting of the flip plates 20. At the same time, after the end of the telescopic sealing column 15 is engaged in the injection liquid inlet hole 303, the injection liquid inlet hole 303 is sealed. At this position, the structure composed of the outer protective shell 1, the mold core 2, the partition plate 3 and the top plate 4 cannot pass the injection material.

[0044] Step 3: After the structure consisting of multiple outer protective shells 1, mold core 2, partition plate 3 and top plate 4 is assembled together, the injection head needs to be inserted into the structure consisting of two semi-annular ferrules 26. When the injection head is located between the two semi-annular ferrules 26, pressure is applied to the semi-annular ferrules 26. After the semi-annular ferrules 26 are pressurized, the semi-annular ferrules 26 slide on the assembly frame 25. At the same time, the positioning seat 27 on the semi-annular ferrule 26 will apply pressure to the straight spring 29, and the straight spring 29 will be deformed under pressure, and the straight spring 29 will be deformed. The deformation generates reverse elastic force, which is used to reset the semi-annular sleeve 26. At the same time, the pressure head is located in the semi-annular sleeve 26 and contacts the flip plate 20 and the support ball 31. The support ball 31 and the flip plate 20 apply pressure to the outer wall of the injection head to ensure the fixing effect of the injection head in the two semi-annular sleeves 26. The injection head is docked with the mounting ring 23, and the molten material enters the injection liquid inlet hole 303 along the guidance of the elastic guide tube 24 and the mounting ring 23 and then enters the mold core 2 to realize the injection molding process.

[0045] Step 4: After the injection molding of one color of injection molding material is completed, it is necessary to inject injection molding materials of other colors into the injection mold. The same injection molding head is used to supply different color pigments, and the top plate 4 is rotated. When the top plate 4 rotates, the structure composed of the rotating parts 5 and the limiting parts 6 at the bottom of the multiple top plates 4 rotates in the rotating groove 301. When the rotating parts 5 and the limiting parts 6 rotate, the structure composed of the mounting seat 13 and the guide beads 14 guides and limits the rotation of the limiting parts 6 and the rotating parts 5, and reduces the resistance to the rotation of the rotating parts 5 and the limiting parts 6. In the process of the rotation of the rotating part 5, when the protrusion 9 is subjected to the pressure of the side wall of the rotating groove 301, the protrusion 9 transmits the pressure to the spring piece 8, the spring piece 8 is deformed, and the protrusion 9 retracts into the rotating part 5. When the rotation angle of the rotating part 5 reaches When the protrusion is 9 degrees, the compressed spring piece 8 pops out the protrusion 9 and engages in another positioning slot 302. At the same time, when the top plate 4 rotates, the mounting ring 23 is subjected to the pulling force during the rotation of the top plate 4, and is deformed and extended. At the same time, the extended part will remain in the give way groove 403, so that injection molding materials of other colors can enter through the top plate 4 at other positions, and then enter the mounting ring 23 corresponding to the top plate 4 at this position. When different injection molding heads are used to inject injection molding materials of different colors into the same position, the top plate 4 can also be rotated to make the top plate 4 correspond to the injection molding heads at other positions. In this way, there is no need to rotate the structure composed of the outer protective shell 1, the mold core 2, the partition plate 3 and the top plate 4. Only the top plate 4 needs to be rotated to achieve injection molding materials of other colors.

[0046] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for using an injection mold for a multi-color injection molded part, comprising four outer protective shells (1), a mold core (2) arranged inside the outer protective shells (1), a partition plate (3) fixedly mounted on the top of the outer protective shells (1), and a top plate (4) arranged on the top of the outer protective shells (1), characterized in that: One side of the top plate (4) is provided with an embedding groove (401), and the other side of the top plate (4) is provided with an embedding strip (402), and the embedding strip (402) is movably engaged in the embedding groove (401) on another top plate (4), and the bottoms of the plurality of top plates (4) are fixedly connected with a rotating part (5) near the connection position, and the bottom of the rotating part (5) is fixedly installed with a limiting part (6), and the rotating part (5) and the limiting part (6) are engaged in the rotating groove (301) provided on the partition plate (3), and a positioning groove (302) is provided on the rotating groove (301), and a bottom plate (7), a spring sheet (8) and a protrusion (9) are provided at a position on the rotating part (5) corresponding to the positioning groove (302), and the bottom plate (7), the spring sheet (8) and the protrusion (9) are fixedly connected to the bottom of the plurality of top plates (4) near the connection position, and a limiting part (6) is fixedly installed on the bottom of the rotating part (5), and the rotating part (5) and the limiting part (6) are engaged in the rotating groove (301) provided on the partition plate (3), and a positioning groove (302) is provided on the rotating groove (301), and a bottom plate (7), a spring sheet (8) and a protrusion (9) are provided at a position corresponding to the positioning groove (302), and the bottom plate (7), the spring sheet (8) and the protrusion (9) are fixedly connected to the bottom of the plurality of top plates (4). ) are arranged parallel to each other, the bottom plate (7) is located at the innermost position on the rotating part (5), the protrusion (9) is located at the outermost position on the rotating part (5), the rotating parts (5) are provided with docking plates (10) on the sides close to each other, the docking plates (10) are provided with fixing grooves (11), and the docking plates (10) on two adjacent rotating parts (5) are arranged in a staggered manner, and fixing strips (12) are mounted in the fixing grooves (11) on the two docking plates (10) that are engaged together, and a mounting seat (13) is provided at a position of the rotating groove (301) corresponding to the limiting part (6), and a guide bead (14) is rotatably connected to the mounting seat (13), and the guide bead (14) is movably engaged in the limiting groove (601) provided on the outer side wall of the limiting part (6); The first step: according to different injection molded parts requirements, the structure consisting of two outer protective shells (1), the mold core (2), the partition plate (3) and the top plate (4) is connected together, and during assembly, the embedding strip (402) on the top plate (4) is snapped into the embedding groove (401) on the other top plate (4), and the position where the embedding strip (402) and the embedding groove (401) are connected is fixed by bolts; Step 2: according to the needs of different injection molded parts, the structure composed of the outer protective shell (1), the mold core (2), the partition plate (3) and the top plate (4) is sealed. The outer protective shell (1), the partition plate (3) and the top plate (4) form a membrane shell. The mold core (2) is replaced separately to meet the needs of different injection molded parts. The adjusting bolt (17) is rotated to make the adjusting bolt (17) rise and fall on the mounting sleeve (16). The lifting and lowering of the adjusting bolt (17) on the mounting sleeve (16) drives the triangular lifting block (18) to rise and fall, so that the triangular lifting block (18) applies pressure to the end of the telescopic sealing column (15). The telescopic sealing column (15) moves in the mounting sleeve (16). The end of the telescopic sealing column (15) located in the partition plate (3) applies pressure to the two flip plates (20), pushing the structure composed of the two flip plates (20) apart. After the end of the telescopic sealing column (15) is engaged in the injection liquid inlet hole (303), the injection liquid inlet hole (303) is sealed. Step 3: The injection molding head is inserted into the structure formed by the two semi-annular ferrules (26). When the injection molding head is located between the two semi-annular ferrules (26), pressure is applied to the semi-annular ferrules (26). After the semi-annular ferrules (26) are pressurized, the semi-annular ferrules (26) slide on the assembly frame (25). The positioning seat (27) on the semi-annular ferrule (26) applies pressure to the straight spring (29). At the same time, the pressure-bearing head is located in the semi-annular ferrule (26) and contacts the flip plate (20) and the support ball (31). The outer wall of the injection molding head is pressurized through the support ball (31) and the flip plate (20). The injection molding head is docked with the mounting ring (23). The molten material enters the injection liquid inlet hole (303) along the guide of the elastic guide tube (24) and the mounting ring (23) and then enters the mold core (2), thereby completing the injection molding process. Step 4: After the injection molding of one color of injection molding material is completed, it is necessary to inject other colors of injection molding material into the injection mold. The same injection molding head is used to supply different color pigments. When the top plate (4) is rotated, the structure composed of the rotating parts (5) and the limiting parts (6) at the bottom of the multiple top plates (4) rotates in the rotating groove (301). The structure composed of the mounting seat (13) and the guide bead (14) guides and limits the rotation of the limiting part (6) and the rotating part (5), and at the same time reduces the resistance to the rotation of the rotating part (5) and the limiting part (6). During the rotation of the rotating part (5), when the protrusion (9) is subjected to the pressure of the side wall of the rotating groove (301), the protrusion (9) transmits the pressure to the spring sheet (8), and the spring sheet (8) is deformed. The block (9) is retracted into the rotating part (5). When the rotating angle of the rotating part (5) reaches the projection (9) degree, the compressed spring sheet (8) ejects the projection (9) and engages in another positioning slot (302). At the same time, when the top plate (4) is rotated, the mounting ring (23) is subjected to the pulling force during the rotation of the top plate (4), and deforms and extends. At the same time, the extended part will remain in the clearance groove (403). In this way, injection molding materials of other colors enter through the top plate (4) at other positions, and then enter the mounting ring (23) corresponding to the top plate (4) at this position. When different injection molding heads are used to inject injection molding materials of different colors into the same position, the top plate (4) can also be rotated to allow the top plate (4) to correspond to the injection molding heads at other positions.

2. The method for using the injection mold for a multi-color injection molded part according to claim 1, characterized in that: The side of the protrusion (9) close to the positioning slot (302) is adapted to the shape of the positioning slot (302).

3. The method for using the injection mold for a multi-color injection molded part according to claim 2, characterized in that: The limiting groove (601) and the guide bead (14) are clearance-fitted.

4. The method for using the injection mold for a multi-color injection molded part according to claim 3, characterized in that: A telescopic sealing column (15) is movably inserted on the partition plate (3), and the end of the telescopic sealing column (15) is arranged to penetrate the outer protective shell (1); an injection liquid inlet hole (303) is opened at the center position of the partition plate (3); a mounting sleeve (16) is arranged at a position outside the outer protective shell (1) corresponding to the telescopic sealing column (15); an adjusting bolt (17) is threadedly mounted on the mounting sleeve (16); a triangular lifting block (18) is also movably mounted in the mounting sleeve (16), and the bottom end of the adjusting bolt (17) is rotatably connected to the triangular lifting block (18).

5. The method for using the injection mold for a multi-color injection molded part according to claim 4, characterized in that: Two rotating rods (19) are rotatably connected in the partition plate (3), and the rotating rods (19) are located on both sides of the telescopic sealing column (15). A flip plate (20) is fixedly mounted on the rotating rods (19), and the flip plate (20) is located on both sides of the telescopic sealing column (15) near the end. A limit plate (21) is also provided in the partition plate (3), and the position of the limit plate (21) corresponds to that of the flip plate (20). An arc spring (22) is provided between the flip plate (20) and the limit plate (21) for connection.

6. The method for using the injection mold for multi-color injection molded parts according to claim 5, characterized in that: A clearance groove (403) is provided at the bottom of the top plate (4), and the clearance groove (403) is connected to the injection hole on the top plate (4); a mounting ring (23) is fixedly mounted on the injection liquid inlet hole (303); an elastic flow guide tube (24) is fixedly mounted on the top of the mounting ring (23); another mounting ring (23) is also fixedly mounted on the top of the elastic flow guide tube (24); and the mounting ring (23) is connected to the injection hole on the top plate (4).

7. The method for using the injection mold for a multi-color injection molded part according to claim 6, characterized in that: Two assembly frames (25) are fixedly mounted on the top of the top plate (4), and the two assembly frames (25) are located on both sides of the injection hole on the top plate (4). Two semi-annular clamping sleeves (26) are slidably connected to the assembly frame (25), and a positioning seat (27) is fixedly mounted on the semi-annular clamping sleeve (26). A limiting sleeve (28) is also fixedly mounted on the assembly frame (25), and the positions of the positioning seat (27) and the limiting sleeve (28) correspond to each other. A straight spring (29) sleeved on the assembly frame (25) is arranged between the positioning seat (27) and the limiting sleeve (28).

8. The method for using the injection mold for multi-color injection molded parts according to claim 7, characterized in that: The two semi-annular ferrules (26) located on the assembly frame (25) are arranged symmetrically.

9. The method for using the injection mold for a multi-color injection molded part according to claim 8, characterized in that: An annular band (30) is provided at a position near the top of the inner wall of the semi-annular ferrule (26), and supporting balls (31) are also provided on the inner wall of the semi-annular ferrule (26). The supporting balls (31) are distributed in an annular array with the central axis of the semi-annular ferrule (26) as the center of the array.

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