A linkage opening and closing precision switching composite mold and an injection molding machine

Abstract

The present invention relates to the technical field of injection molding equipment, and specifically relates to an interlocking opening and closing precision switching composite mold and an injection molding machine, including a fixed mold assembly and a moving mold assembly that open and close with each other. The fixed mold assembly includes a fixed mold base, a first driving member, and at least two first mold cores with grooves of different shapes; the moving mold assembly includes a moving mold base, a second driving member, and at least two second mold cores with protrusions of different shapes. In the present invention, several first mold cores with grooves of different shapes are slidably arranged on the fixed mold base, and several second mold cores with protrusions of different shapes are slidably arranged on the moving mold base. When it is necessary to switch the injection cavity, the first driving member and the second driving member are started, that is, the corresponding first mold core is pushed to the first injection position, and the corresponding second mold core is pushed to the second injection position. There is no need for large movement between the overall molds, the structure is simple, and it is easy to operate, with higher controllability and precision.

Description

Technical Field

[0001] The present invention relates to the technical field of injection molding equipment, and in particular to a linked opening and closing precision switching composite mold. The present invention also relates to an injection molding machine. Background Art

[0002] An injection molding machine, also known as an injection molding machine or injection machine, is the primary molding equipment used to create plastic products of various shapes from thermoplastics or thermosetting plastics using plastic molding molds. Injection molding machines are primarily categorized as vertical, horizontal, and all-electric. They heat the plastic and apply high pressure to the molten plastic, causing it to eject and fill the mold cavity.

[0003] Most molds used in injection molding machines are independently set up. Manually replacing molds according to the needs of the processed products is not only cumbersome, time-consuming and labor-intensive, but also has high labor costs. It also affects the processing efficiency of the injection molding machine. In addition, molds of various specifications also require a certain amount of space, which not only increases the cost of initial production investment, but also increases the difficulty of switching between molds, which has great limitations.

[0004] Chinese patent CN108582649B discloses a switchable composite mold for an injection molding machine, comprising a square rotating support and injection molds of different specifications fixedly mounted on four sides of the square rotating support, and also comprising a mold switching drive mechanism, multiple mold ejection support mechanisms, and a circumferential rotation mechanism for simultaneously driving the multiple mold ejection support mechanisms; the mold switching drive mechanism comprises a first mounting seat and a second mounting seat correspondingly arranged on both sides of the square rotating support, wherein a stabilizing rod is rotatably mounted on one side of the first mounting seat, a third motor is internally mounted on one side of the second mounting seat, a rotating rod is connected to the output shaft of the third motor, and the stabilizing rod and the rotating rod are horizontally connected at both ends of the transverse center pillar.

[0005] This switchable composite mold achieves the purpose of switching molds by arranging injection molds of different specifications around a square rotating support and using a mold switching drive mechanism to drive the injection molds to rotate at different angles. However, the overall weight of the mold is large, and the switching accuracy of switching injection molds of different specifications by switching the drive mechanism is low, and extremely heavy molds can easily fall off the square rotating mold. Summary of the Invention

[0006] In response to the above problems, a linkage opening and closing precision switching composite mold is provided. The first driving member can push the first mold core with cavities of different shapes to the first injection position of the fixed mold base, and the second driving member can push the second mold core with protrusions of different shapes to the second injection position of the movable mold base. When the mold is closed, the cavity of the first injection position can form a complete molding cavity with the protrusion of the second injection position, which solves the complexity of switching extremely heavy molds and avoids the mold from falling off.

[0007] To solve the problems of the existing technology, the present invention provides a linkage opening and closing precision switching composite mold, which includes a fixed mold assembly and a moving mold assembly that open and close with each other. The fixed mold assembly includes a fixed mold base, a first driving member, and at least two first mold cores with concave cavities of different shapes. On the mold opening side of the fixed mold base, there is a first injection position and a first waiting position distributed circumferentially along the first injection position. The first mold cores are slidably arranged on the first waiting position. The first driving member is arranged on the fixed mold base and is in transmission connection with the first mold cores. The first driving member can push the first mold cores from the first waiting position to the first injection position. The moving mold assembly includes a moving mold base, a second driving member, and at least two second mold cores with convex blocks of different shapes. On the mold opening side of the moving mold base, there is a second injection position and a second waiting position distributed circumferentially along the second injection position. The second mold cores are slidably arranged on the second waiting position. The second driving member is arranged on the moving mold base and is in transmission connection with the second mold cores. The second driving member can push the second mold cores from the second waiting position to the second injection position. The first mold cores located on the first injection position and the second mold cores located on the second injection position are closed to form a complete injection cavity.

[0008] Preferably, on the mold opening side of the fixed mold base, there is a first groove and a second groove distributed circumferentially along the first groove. The first groove forms the first injection position, the second groove forms the first waiting position, the first groove and the second groove are connected, and the first mold cores are slidably arranged in the second groove.

[0009] Preferably, on the side wall of the second groove, there is a first positioning strip extending along the sliding direction of the first mold cores. On both sides of the first mold cores, there are first sliding grooves, and the first positioning strip is in sliding cooperation with the first sliding grooves.

[0010] Preferably, on the mold opening side of the moving mold base, there is a third groove and a fourth groove distributed circumferentially along the third groove. The third groove forms the second injection position, the fourth groove forms the second waiting position, the third groove and the fourth groove are connected, and the second mold cores are slidably arranged in the fourth groove.

[0011] Preferably, on the side wall of the fourth groove, there is a second positioning strip extending along the sliding direction of the second mold cores. On both sides of the second mold cores, there are second sliding grooves, and the second positioning strip is in sliding cooperation with the second sliding grooves.

[0012] Preferably, the first driving member is a first cylinder, the first cylinder is arranged outside the fixed mold base, the output shaft of the first cylinder penetrates through the fixed mold base and is fixedly connected to the first mold core, the fixed mold assembly further includes an injection nozzle and an air storage member, the injection nozzle penetrates through the fixed mold base and communicates with the first injection position, and an injection channel that can communicate with the injection nozzle is arranged in the first mold core; the air storage member is arranged between the first mold core and the first waiting position, an air flow channel is arranged in the first waiting position, and the air storage member communicates with the air flow channel; when the first mold core is located at the first injection position, the injection nozzle communicates with the injection channel; during the process of the first mold core moving from the first injection position to the first waiting position, the air storage member accumulates gas and injects it into the air flow channel in a closed state; when the first mold core is located at the first waiting position, the injection channel communicates with the air flow channel.

[0013] Preferably, the air storage member includes a piston ring and a one-way valve, a plug cavity is further formed in the fixed mold base, the plug cavity is coaxial with the output shaft of the first cylinder, the inner end of the plug cavity communicates with the air flow channel, the piston ring is slidably arranged in the plug cavity coaxially, and the output shaft of the first cylinder penetrates through the piston ring and is fixedly connected to it; the one-way valve penetrates through the fixed mold base and is arranged on the air flow channel, and when the piston ring slides along the first injection position towards the first waiting position, the pressure in the air flow channel increases.

[0014] Preferably, the moving mold assembly further includes a push plate and a first ejector pin arranged on the push plate, the first ejector pin slidably penetrates through the second injection position on the moving mold base, and a material ejecting member that can be connected to the first ejector pin is further arranged in the second mold core. When the second mold core is located at the second injection position, the first ejector pin can push the material ejecting member to eject the workpiece from the second mold core.

[0015] Preferably, the second mold core is sequentially provided with a first circular groove, a second circular groove and a third circular groove with gradually decreasing diameters from its inner side to its outer side. The material ejecting member includes a limit ring, a second ejector pin and a first spring. The limit ring is arranged in the first circular groove, the head of the second ejector pin is slidably arranged in the second circular groove, the body of the second ejector pin slidably penetrates through the third circular groove, the inner hole of the limit ring is a tapered hole, and the inner diameter of the left side of the tapered hole is larger than the diameter of the body of the first ejector pin, while the inner diameter of the right side is smaller than the diameter of the head of the second ejector pin; a stepped surface is formed between the second circular groove and the third circular groove, and the first spring is sleeved on the second ejector pin, and the first spring is located between the head of the second ejector pin body and the stepped surface.

[0016] The present invention also relates to an injection molding machine, including a linkage opening and closing precision switching composite mold.

[0017] The beneficial effects of the present invention compared with the prior art are as follows: By slidably arranging several first mold cores with concave cavities of different shapes on the fixed mold base and several second mold cores with convex blocks of different shapes on the moving mold base, when it is necessary to switch the injection mold cavity, the first driving member and the second driving member are activated, that is, the corresponding first mold core is pushed to the first injection position, and the corresponding second mold core is pushed to the second injection position. There is no need for large movement between the overall molds. At the same time, when the first mold core is reset, the air storage member can be linked to inject air into the air flow channel, thereby increasing the pressure in the air flow channel. That is, when the first mold core is completely reset, the pressurized gas in the air flow channel can blow out the residual molten material in the injection channel, thus preventing blockage. The structure is simple, easy to operate, and has higher controllability and precision. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a perspective view of a linkage opening and closing precision switching composite mold;

[0019] Figure 2 is a perspective sectional view of a linkage opening and closing precision switching composite mold;

[0020] Figure 3 is a sectional view of a linkage opening and closing precision switching composite mold;

[0021] Figure 4 is Figure 3 a partial enlarged view of part A of

[0022] Figure 5 is Figure 3 a partial enlarged view of part B of

[0023] Figure 6 is Figure 3 a partial enlarged view of part C of

[0024] Figure 7 is a perspective view of a linkage opening and closing precision switching composite mold in the first perspective when the mold is opened;

[0025] Figure 8 is a perspective view of a linkage opening and closing precision switching composite mold in the second perspective when the mold is opened;

[0026] Figure 9 is a three-dimensional exploded view of the fixed mold assembly in a linkage opening and closing precision switching composite mold;

[0027] Figure 10 is a three-dimensional exploded view of the moving mold assembly in a linkage opening and closing precision switching composite mold.

[0028] The reference numerals in the figure are: 11 - fixed mold base; 111 - first fixing seat; 112 - first positioning strip; 113 - air flow channel; 1131 - first transverse section; 1132 - longitudinal section; 1133 - second transverse section; 1134 - plug; 114 - plug cavity; 115 - first groove; 116 - second groove; 12 - first driving member; 13 - first mold core; 131 - concave cavity; 132 - injection channel; 14 - fixed mold bottom plate; 15 - fixed mold mounting plate; 16 - injection nozzle; 17 - air storage member; 171 - piston ring; 172 - one - way valve; 21 - moving mold base; 211 - second fixing seat; 212 - second positioning strip; 213 - third groove; 214 - fourth groove; 22 - second driving member; 23 - second mold core; 231 - convex block; 2321 - limiting ring; 2322 - second ejector pin; 2323 - spring; 24 - moving mold bottom plate; 25 - spacer block; 26 - moving mold mounting plate; 27 - push plate; 28 - first ejector pin; 291 - fixing pin; 292 - second spring; 31 - first cooling pipe; 32 - second cooling pipe. Detailed implementation mode

[0029] To further understand the features, technical means, specific purposes and functions achieved by the present invention, the present invention will be further described in detail below in conjunction with the drawings and specific implementation modes.

[0030] As Figure 1 and Figure 2 shown, the present invention provides a linkage opening - closing precision - switching composite mold, including a fixed - mold assembly and a moving - mold assembly that open and close with each other. The fixed - mold assembly includes a fixed - mold base 11, a first driving member 12, and at least two first mold cores 13 with concave cavities 131 of different shapes. On the mold - opening side of the fixed - mold base 11, there is a first injection position and a first waiting position distributed circumferentially along the first injection position. The first mold core 13 is slidably arranged on the first waiting position. The first driving member 12 is arranged on the fixed - mold base 11 and is in transmission connection with the first mold core 13. The first driving member 12 can push the first mold core 13 from the first waiting position to the first injection position. The moving - mold assembly includes a moving - mold base 21, a second driving member 22, and at least two second mold cores 23 with convex blocks 231 of different shapes. On the mold - opening side of the moving - mold base 21, there is a second injection position and a second waiting position distributed circumferentially along the second injection position. The second mold core 23 is slidably arranged on the second waiting position. The second driving member 22 is arranged on the moving - mold base 21 and is in transmission connection with the second mold core 23. The second driving member 22 can push the second mold core 23 from the second waiting position to the second injection position. The first mold core 13 located at the first injection position and the second mold core 23 located at the second injection position are closed - molded to form a complete injection cavity.

[0031] The fixed mold assembly further includes a fixed mold bottom plate 14 and a fixed mold mounting plate 15. The moving mold assembly further includes a moving mold bottom plate 24, a spacer block 25, a moving mold mounting plate 26, a fixing pin 291 and a second spring 292. The fixing pin 291 is arranged between the moving mold bottom plate 24 and the moving mold mounting plate 26. The fixing pin 291 slidably penetrates through the push plate 27. The second spring 292 is sleeved on the fixing pin 291. The second spring 292 is located between the push plate 27 and the moving mold mounting plate 26.

[0032] A first cooling pipe 31 is arranged in the fixed mold assembly, and a second cooling pipe 32 is arranged in the moving mold assembly.

[0033] When the fixed mold assembly and the moving mold assembly are separated, the first driving member 12 can drive the first mold core 13 connected thereto to move from the first waiting station to the first injection position, and the second driving member 22 can drive the second mold core 23 connected thereto to move from the second waiting station to the second injection position, so that the first mold core 13 at the first injection position and the second mold core 23 at the second injection position form a complete injection structure, and a complete injection cavity is formed. Molten material is injected into the injection cavity to complete the production of the workpiece.

[0034] By switching the first mold cores 13 with different shapes to move to the first injection position and switching the second mold cores 23 with different shapes to move to the second injection position, the function of producing workpieces with different shapes in the same mold can be realized.

[0035] It should be noted that Figure 9 、 10 In the figure, it shows that there are four first mold cores 13 and four second mold cores 23 respectively. However, the number of the first mold cores 13 and the second mold cores 23 can be greater than or equal to two. The first mold cores 13 are evenly distributed around the periphery of the first injection position.

[0036] In this embodiment, four first mold cores 13 with different-shaped cavities 131 are slidably arranged on the fixed mold base 11, and four second mold cores 23 with different-shaped protrusions 231 are slidably arranged on the moving mold base 21. When it is necessary to switch the injection cavity, the first driving member 12 and the second driving member 22 are started, that is, the corresponding first mold core 13 is pushed to the first injection position, and the corresponding second mold core 23 is pushed to the second injection position. There is no need for a large movement between the overall molds. The structure is simple, easy to operate, and has higher controllability and precision.

[0037] As Figure 7 and Figure 9 shown, a first groove 115 is arranged on the mold opening side of the fixed mold base 11, and four second grooves 116 are distributed circumferentially along the first groove 115. The first groove 115 forms the first injection position, the second grooves 116 form the first waiting stations, the first groove 115 and the second grooves 116 are communicated, and the first mold cores 13 are slidably arranged in the second grooves 116.

[0038] Since the first groove 115 communicates with the second groove 116, when the first driving member 12 is activated, the first mold core 13 in the second groove 116 can move into the first groove 115, so that the first mold core 13 moves from the first waiting position to the first injection position, enabling the first mold core 13 to form a complete injection cavity with the second mold core 23.

[0039] As Figure 7 and Figure 9 shown, a first positioning strip 112 extending along the sliding direction of the first mold core 13 is provided on the side wall of the second groove 116, and first sliding grooves are provided on both sides of the first mold core 13. The first positioning strip 112 is in sliding fit with the first sliding grooves, enabling the first sliding grooves on the side of the first mold core 13 to stably slide with the first positioning strip 112, thereby preventing the first mold core 13 from exiting the first groove 115 and the second groove 116.

[0040] A first stepped groove is provided on the side of the second groove 116, and a first fixing seat 111 is provided on the first stepped groove. The first fixing strip is fixed to the first stepped groove by bolts, and the first positioning strip 112 is provided on the side of the first fixing seat 111, facilitating the slidable arrangement of the first mold core 13 in the second groove 116.

[0041] As Figure 9 shown, the first groove 115 is located at the central position on the mold opening side of the stationary mold base 11, and the second groove 116 is distributed longitudinally and laterally outside the first groove 115. A first stepped groove is provided on the side of the second groove 116, and the first fixing seat 111 is fixedly installed on the first stepped groove by bolts. A first positioning strip 112 extending along its length direction is provided on the outside of the first fixing seat 111, facilitating the installation of the first mold core 13 in the second groove and preventing the first mold core 13 from falling off.

[0042] As Figure 8 and Figure 10 shown, a third groove 213 and fourth grooves 214 distributed circumferentially along the third groove 213 are provided on the mold opening side of the moving mold base 21. The third groove 213 forms a second injection position, the fourth grooves 214 form second waiting positions, the third groove 213 communicates with the fourth grooves 214, and the second mold core 23 is slidably arranged in the fourth grooves 214.

[0043] Since the third groove 213 communicates with the fourth grooves 214, when the second driving member 22 is activated, the second mold core 23 in the fourth grooves 214 can move into the third groove 213, so that the second mold core 23 moves from the second waiting position to the second injection position, enabling the second mold core 23 to form a complete injection cavity with the first mold core 13.

[0044] As Figure 8 and Figure 10 shown, a second positioning strip 212 extending along the sliding direction of the second mold core 23 is provided on the side wall of the fourth groove 214. Second sliding grooves are provided on both sides of the second mold core 23, and the second positioning strip 212 is in sliding fit with the second sliding grooves.

[0045] A second stepped groove is provided on the side surface of the fourth groove 214. A second fixing seat 211 is provided on the second stepped groove. The second fixing strip is fixed to the second stepped groove by bolts. The second positioning strip 212 is provided on the side surface of the second fixing seat 211, so as to slidably arrange the second mold core 23 in the fourth groove 214.

[0046] To enable the second mold core 23 to slide stably in the third groove 213 and the fourth groove 214, a second positioning strip 212 is also provided on the side wall of the third groove 213, so that the second sliding groove on the side surface of the second mold core 23 can slide stably with the second positioning strip 212, thereby preventing the second mold core 23 from withdrawing from the third groove 213 and the fourth groove 214.

[0047] As Figure 3 shown, the first driving member 12 is a first air cylinder. The first air cylinder is arranged outside the fixed mold base 11. The output shaft of the first air cylinder penetrates through the fixed mold base 11 and is fixedly connected to the first mold core 13. The fixed mold assembly further includes an injection nozzle 16 and an air storage member 17. The injection nozzle 16 penetrates through the fixed mold base 11 and is communicated with the first injection position. An injection channel 132 that can be communicated with the injection nozzle 16 is provided in the first mold core 13; the air storage member 17 is arranged between the first mold core 13 and the first waiting position. An air flow channel 113 is provided in the first waiting position, and the air storage member 17 is communicated with the air flow channel 113; when the first mold core 13 is located at the first injection position, the injection nozzle 16 is communicated with the injection channel 132; during the process of the first mold core 13 moving from the first injection position to the first waiting position, the air storage member 17 accumulates gas and injects it into the air flow channel 113 in a closed state; when the first mold core 13 is located at the first waiting position, the injection channel 132 is communicated with the air flow channel 113.

[0048] When the first air cylinder is started, the output shaft of the first air cylinder drives the first mold core 13 to move from the first waiting position to the first injection position, so that the injection channel 132 on the first mold core 13 is communicated with the injection nozzle 16. When the first mold core 13 at the first injection position and the second mold core 23 at the second injection position are clamped, the molten material flows into the molding cavity through the injection nozzle 16 and the injection channel 132, thereby forming a workpiece.

[0049] When switching the first mold core 13 at the first injection position, the output shaft of the first cylinder drives the first mold core 13 at the first injection position to move to the first waiting position. During this process, the air storage member 17 accumulates gas and injects it into the closed air flow channel 113, and the pressure in the air flow channel 113 increases. Until the first mold core 13 moves to the first waiting position, the injection channel 132 in the first mold core 13 can communicate with the air flow channel 113, enabling the compressed air in the air flow channel 113 to quickly pass through the injection channel 132, thereby cleaning the injection channel 132 to prevent materials from clogging in the injection channel 132 and making it impossible to perform the next injection operation.

[0050] As Figure 4 and Figure 5 shown, the air storage member 17 includes a piston ring 171 and a one-way valve 172. A plug cavity 114 is further formed on the fixed mold base 11. The plug cavity 114 is coaxial with the output shaft of the first cylinder. The inner end of the plug cavity 114 communicates with the air flow channel 113. The piston ring 171 is slidably disposed in the plug cavity 114 coaxially, and the output shaft of the first cylinder penetrates through the piston ring 171 and is fixedly connected thereto; the one-way valve 172 penetrates through the fixed mold base 11 and is disposed on the air flow channel 113. When the piston ring 171 slides along the first injection position towards the first waiting position, the pressure in the air flow channel 113 increases.

[0051] It should be noted that the one-way valve 172 here only allows external air to enter the air flow channel 113, and the air in the air flow channel 113 cannot overflow through the one-way valve 172. As Figure 4 shown, when the piston ring 171 moves upward, the pressure above the piston ring 171 increases, thereby increasing the pressure in the air flow channel 113 communicated therewith.

[0052] The one-way valve 172 is a prior art and will not be introduced here.

[0053] The air flow channel 113 has a first horizontal section 1131, a vertical section 1132, and a second horizontal section 1133 connected in sequence. The left end of the first horizontal section 1131 communicates with the plug cavity 114. The right end of the first horizontal section 1131 penetrates through the fixed mold base 11 for facilitating the opening of a hole. A plug 1134 is provided at the right end of the first horizontal section 1131. The one-way valve 172 penetrates through the fixed mold base 11 and communicates with the first horizontal section 1131. The left end of the second horizontal section 1133 communicates with the first waiting position. The vertical section 1132 communicates the first horizontal section 1131 and the second horizontal section 1133.

[0054] When the output shaft of the first cylinder drives the piston ring 171 to move towards the outer end of the plug cavity 114, outside air can flow into the air flow channel 113 through the one-way valve 172. When the output shaft of the first cylinder drives the piston ring 171 to move towards the inner end of the plug cavity 114, the movement of the piston ring 171 will increase the pressure in the air flow channel 113. Until the first mold core 13 moves to the first waiting station, the air flow channel 113 communicates with the injection channel 132 of the first mold core 13, and then the pressurized gas in the air flow channel 113 is discharged outward through the injection channel 132 to prevent the material in the injection channel 132 from being blocked.

[0055] As Figure 3 and Figure 6 shown, the moving mold assembly further includes a push plate 27 and a first ejector pin 28 provided on the push plate. The first ejector pin 28 slidably penetrates through the second injection position on the moving mold base 21. A ejecting member that can be connected to the first ejector pin 28 is also provided in the second mold core 23. When the second mold core 23 is located at the second injection position, the first ejector pin 28 can push the ejecting member to push the workpiece out of the second mold core 23.

[0056] When the push plate 27 drives the first ejector pin 28 to move in the moving mold base 21, the first ejector pin 28 penetrates through the second injection position and abuts against the ejecting member, enabling the ejecting member to eject the workpiece on the second mold core 23, thereby completing the separation of the workpiece from the second mold core 23.

[0057] As Figure 6 shown, the second mold core 23 is sequentially provided with a first circular groove, a second circular groove, and a third circular groove with gradually decreasing diameters from its inner side to its outer side. The ejecting member includes a limiting ring 2321, a second ejector pin 2322, and a first spring 2323. The limiting ring 2321 is arranged in the first circular groove. The head of the second ejector pin 2322 is slidably arranged in the second circular groove. The body of the second ejector pin 2322 slidably penetrates through the third circular groove. The inner hole of the limiting ring 2321 is a tapered hole, and the inner diameter of the left side of the tapered hole is larger than the diameter of the body of the first ejector pin 28, while the inner diameter of the right side is smaller than the diameter of the head of the second ejector pin 2322. A stepped surface is formed between the second circular groove and the third circular groove. The first spring 2323 is sleeved on the second ejector pin 2322, and the first spring 2323 is located between the head of the second ejector pin body and the stepped surface.

[0058] The limiting ring 2321 can prevent the second ejector pin 2322 from detaching from the first mold core 13 under the action of the first spring 2323. When the second mold core 23 at the second waiting station moves to the second injection position, the first ejector pin 28 is coaxial with the second ejector pin 2322. After the ejector plate 27 drives the first ejector pin 28 to move, the first ejector pin 28 passes through the limiting ring 2321 and abuts against the head of the second ejector pin 2322, so that the second ejector pin 2322 overcomes the elastic force of the first spring 2323 and slides in the second mold core 23. The body of the second ejector pin 2322 can eject the workpiece on the second mold core 23 from the second mold core 23, thereby completing the demolding of the workpiece.

[0059] An injection molding machine includes a linkage opening and closing precision switching composite mold.

[0060] The above embodiments only represent one or several implementation manners of the present invention, and the description thereof is relatively specific and detailed, but it should not be construed as a limitation on the scope of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several deformations and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims

1. A linkage opening and closing precision switching composite mold, comprising a fixed mold assembly and a movable mold assembly that open and close with each other, characterized in that The fixed mold assembly includes a fixed mold base (11), a first driving member (12), and at least two first mold cores (13) having concave cavities (131) with different shapes. The opening side of the fixed mold base (11) is provided with a first injection position and a first waiting position circumferentially distributed along the first injection position. The first mold cores (13) are slidably arranged on the first waiting position. The first driving member (12) is arranged on the fixed mold base (11) and is in transmission connection with the first mold cores (13). The first driving member (12) can push the first mold cores (13) from the first waiting position to the first injection position. The moving mold assembly includes a moving mold base (21), a second driving member (22), and at least two second mold cores (23) having bumps (231) with different shapes. The opening side of the moving mold base (21) is provided with a second injection position and a second waiting position circumferentially distributed along the second injection position. The second mold cores (23) are slidably arranged on the second waiting position. The second driving member (22) is arranged on the moving mold base (21) and is in transmission connection with the second mold cores (23). The second driving member (22) can push the second mold cores (23) from the second waiting position to the second injection position. The first mold cores (13) located at the first injection position and the second mold cores (23) located at the second injection position are clamped to form a complete injection cavity. The first driving member (12) is a first air cylinder. The fixed mold assembly further includes an injection nozzle (16) and an air storage member (17). An air flow channel (113) is arranged in the first waiting position. The air storage member (17) includes a piston ring (171) and a one-way valve (172). A plug cavity (114) is further formed on the fixed mold base (11). The plug cavity (114) is coaxial with the output shaft of the first air cylinder. The inner end of the plug cavity (114) is communicated with the air flow channel (113). The piston ring (171) is slidably arranged in the plug cavity (114) coaxially. The output shaft of the first air cylinder penetrates through the piston ring (171) and is fixedly connected thereto. The one-way valve (172) penetrates through the fixed mold base (11) and is arranged on the air flow channel (113). When the piston ring (171) slides along the first injection position towards the first waiting position, the pressure in the air flow channel (113) increases.

2. The linkage opening and closing precision switching composite mold according to claim 1, characterized in that, A first groove (115) and a second groove (116) circumferentially distributed along the first groove (115) are formed on the opening side of the fixed mold base (11). The first groove (115) forms the first injection position, and the second groove (116) forms the first waiting position. The first groove (115) and the second groove (116) are communicated. The first mold cores (13) are slidably arranged in the second groove (116).

3. The linkage opening and closing precision switching composite die according to claim 2, characterized in that, A first positioning strip (112) extending along the sliding direction of the first mold cores (13) is arranged on the side wall of the second groove (116). First sliding grooves are arranged on both sides of the first mold cores (13). The first positioning strip (112) is in sliding fit with the first sliding grooves.

4. A linkage opening and closing precision switching composite mold according to claim 1, characterized in that, On the mold opening side of the moving mold base (21), there is a third groove (213) and fourth grooves (214) distributed circumferentially along the third groove (213). The third groove (213) forms a second injection position, and the fourth grooves (214) form a second waiting position. The third groove (213) and the fourth grooves (214) are connected. The second mold core (23) is slidably arranged in the fourth grooves (214).

5. The linkage opening and closing precision switching composite mold according to claim 4, wherein, On the side wall of the fourth groove (214), there is a second positioning strip (212) extending along the sliding direction of the second mold core (23). On both sides of the second mold core (23), there are second sliding grooves. The second positioning strip (212) is in sliding fit with the second sliding grooves.

6. The linkage opening and closing precision switching composite mold according to claim 2 or 3, characterized in that, The first air cylinder is arranged outside the fixed mold base (11). The output shaft of the first air cylinder penetrates through the fixed mold base (11) and is fixedly connected to the first mold core (13). The injection nozzle (16) penetrates through the fixed mold base (11) and is communicated with the first injection position. In the first mold core (13), there is an injection channel (132) that can be communicated with the injection nozzle (16); the air storage part (17) is communicated with the air flow channel (113); when the first mold core (13) is at the first injection position, the injection nozzle (16) is communicated with the injection channel (132); during the process of the first mold core (13) moving from the first injection position to the first waiting position, the air storage part (17) accumulates gas and injects it into the air flow channel (113) in a closed state; when the first mold core (13) is at the first waiting position, the injection channel (132) is communicated with the air flow channel (113).

7. The linkage opening and closing precision switching composite mold according to claim 5, characterized in that, The moving mold assembly further includes a push plate (27) and a first ejector pin (28) arranged on the push plate (27). The first ejector pin (28) slidably penetrates through the second injection position on the moving mold base (21). In the second mold core (23), there is also a ejecting part that can be connected to the first ejector pin (28). When the second mold core (23) is at the second injection position, the first ejector pin (28) can push the ejecting part to push the workpiece out of the second mold core (23).

8. The linkage opening and closing precision switching composite mold according to claim 7, characterized in that From the inner side to the outer side of the second mold core (23), there are successively a first circular groove, a second circular groove, and a third circular groove with gradually decreasing diameters. The ejecting part includes a limit ring (2321), a second ejector pin (2322), and a first spring (2323). The limit ring (2321) is arranged in the first circular groove. The head of the second ejector pin (2322) is slidably arranged in the second circular groove. The body of the second ejector pin (2322) slidably penetrates through the third circular groove. The inner hole of the limit ring (2321) is a tapered hole, and the inner diameter of the left side of the tapered hole is larger than the diameter of the body of the first ejector pin (28), while the inner diameter of the right side is smaller than the diameter of the head of the second ejector pin (2322); a stepped surface is formed between the second circular groove and the third circular groove. The first spring (2323) is sleeved on the second ejector pin (2322), and the first spring (2323) is located between the head of the second ejector pin body and the stepped surface.

9. An injection molding machine, characterized in that, Comprising a linkage opening and closing precision switching composite mold as described in any one of claims 5, 7, and 8.

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