Linkage opening and closing precise switching type composite die and injection molding machine

Abstract

The invention relates to the technical field of injection molding equipment, in particular to a linkage opening and closing precise switching type composite mold and an injection molding machine, the linkage opening and closing precise switching type composite mold comprises a fixed mold assembly and a movable mold assembly which are mutually opened and closed, and the fixed mold assembly comprises a fixed mold base, a first driving part and at least two first mold cores with grooves in different shapes; the movable mold assembly comprises a movable mold base, a second driving piece and at least two second mold cores with convex blocks in different shapes, the first mold cores with the grooves in different shapes are arranged on the fixed mold base in a sliding mode, and the second mold cores with the convex blocks in different shapes are arranged on the movable mold base in a sliding mode; when injection molding cavities need to be switched, the first driving piece and the second driving piece are started, namely, the corresponding first mold core is pushed to the first injection molding position, the corresponding second mold core is pushed to the second injection molding position, the whole mold does not need to move greatly, the structure is simple, operation is easy, and controllability and precision are higher.

Description

Technical Field

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

[0002] Injection molding machine, also known as injection molding machine or injection machine, is the main molding equipment that uses plastic molding molds to make plastic products of various shapes from thermoplastics or thermosetting plastics. Injection molding machines are mainly divided into vertical, horizontal, and all-electric types. Injection molding machines can heat plastics and apply high pressure to molten plastics to make them ejected and fill the mold cavity.

[0003] Most of the 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 need to occupy 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 surfaces of the square rotating support, and also comprising a mold switching drive mechanism, multiple mold ejection support mechanisms, and a circular rotation mechanism that simultaneously drives 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 to the two ends of the transverse center pillar.

[0005] The 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 is low when switching injection molds of different specifications by switching the drive mechanism, and extremely heavy molds are easily detached from the square rotating mold. Summary of the invention

[0006] In view of the above problems, a linkage opening and closing precision switching composite mold is provided, wherein a first mold core with a cavity of different shapes can be pushed to a first injection position of a fixed mold seat through a first driving member, and a second mold core with a protrusion of different shapes can be pushed to a second injection position of a movable mold seat through a second driving member, so that 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, thereby solving the complexity of switching extremely heavy molds and avoiding the mold from falling off.

[0007] In order to solve the problems of the prior art, the present invention provides a linkage opening and closing precision switching composite mold, comprising a fixed mold assembly and a movable mold assembly that open and close each other, the fixed mold assembly comprising a fixed mold base, a first driving member and at least two first mold cores with concave cavities of different shapes, the mold opening side of the fixed mold base is provided with a first injection position, and a first waiting position distributed along the circumference of the first injection position, the first mold core is slidably arranged on the first waiting position, the first driving member is arranged on the fixed mold base and is transmission-connected to the first mold core, and the first driving member can push the first mold core from the first waiting position to the first waiting position An injection position; the movable mold assembly includes a movable mold base, a second driving member and at least two second mold cores with protrusions of different shapes, the mold opening side of the movable mold base is provided with a second injection position, and a second waiting position distributed along the circumference of the second injection position, the second mold core is slidably arranged on the second waiting position, the second driving member is arranged on the movable mold base and is transmission-connected with the second mold core, the second driving member can push the second mold core from the second waiting position to the second injection position, the first mold core located on the first injection position is molded with the second mold core located on the second injection position to form a complete injection cavity.

[0008] Preferably, the open mold side of the fixed mold seat is provided with a first groove and a second groove distributed along the circumference of the first groove, the first groove forms a first injection position, the second groove forms a first waiting position, the first groove and the second groove are connected, and the first mold core is slidably arranged in the second groove.

[0009] Preferably, the side wall of the second groove is provided with a first positioning strip extending along the sliding direction of the first mold core, and first sliding grooves are provided on both sides of the first mold core, and the first positioning strip is slidably matched with the first sliding grooves.

[0010] Preferably, the opening side of the movable mold seat is provided with a third groove, and a fourth groove distributed along the circumference of the third groove, the third groove forms a second injection position, the fourth groove forms a second waiting position, the third groove and the fourth groove are connected, and the second mold core is slidably arranged in the fourth groove.

[0011] Preferably, the side wall of the fourth groove is provided with a second positioning strip extending along the sliding direction of the second mold core, and second sliding grooves are provided on both sides of the second mold core, and the second positioning strip is slidably matched with the second sliding groove.

[0012] Preferably, the first driving member is a first cylinder, which is arranged on the outer side of the fixed mold seat, and the output shaft of the first cylinder passes through the fixed mold seat and is fixedly connected to the first mold core, the fixed mold assembly also includes an injection nozzle and an air storage member, the injection nozzle passes through the fixed mold seat and is connected with the first injection position, and an injection channel that can be connected with the injection nozzle is provided in the first mold core; the air storage member is arranged between the first mold core and the first waiting position, and an air flow channel is provided in the first waiting position, and the air storage member is connected with the air flow channel; when the first mold core is located at the first injection position, the injection nozzle is connected 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 is connected with the air flow channel.

[0013] Preferably, the air storage component includes a piston ring and a one-way valve, and a plug cavity is further provided on the fixed mold seat. The plug cavity is coaxial with the output shaft of the first cylinder, and the inner end of the plug cavity is connected to the air flow channel. The piston ring is coaxially slidably arranged in the plug cavity, and the output shaft of the first cylinder passes through the piston ring and is fixedly connected thereto; the one-way valve passes through the fixed mold seat and is arranged on the air flow channel, and when the piston ring slides along the first injection position toward the first waiting position, the pressure in the air flow channel increases.

[0014] Preferably, the movable mold assembly also includes a push plate, and a first ejector pin arranged on the push rod, the first ejector pin slides through the second injection position on the movable mold base, and the second mold core is also provided with an ejector piece that can be connected with the first ejector pin. When the second mold core is located at the second injection position, the first ejector pin can push the ejector piece to push the workpiece out of the second mold core.

[0015] Preferably, the second mold core is 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 ejection member comprises a limiting ring, a second ejector pin and a first spring, the limiting ring is arranged in the first circular groove, the head of the second ejector pin is slidably arranged in the second circular groove, the needle body of the second ejector pin slides through the third circular groove, the inner hole of the limiting ring is a tapered hole, and the inner diameter of the left side of the tapered hole is larger than the diameter of the needle 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, the first spring is sleeved on the second ejector pin, and the first spring is located between the head of the second needle body and the stepped surface.

[0016] The invention also relates to an injection molding machine, comprising 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: the present invention slidingly sets a plurality of first mold cores with concave cavities of different shapes on a fixed mold base, and slidingly sets a plurality of second mold cores with protrusions of different shapes on a movable mold base. When it is necessary to switch the injection cavity, the first driving member and the second driving member are started, and 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. No large movement is required 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 to increase 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 to prevent blockage. The structure is simple and easy to operate, and the controllability and precision are higher. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a three-dimensional diagram of a linkage opening and closing precision switching composite mold; Figure 2 It is a three-dimensional cross-sectional view of a linkage opening and closing precision switching composite mold; Figure 3 It is a cross-sectional view of a linkage opening and closing precision switching composite die; Figure 4 yes Figure 3 A local enlarged view of point A; Figure 5 yes Figure 3 A partial enlarged view of point B; Figure 6 yes Figure 3 A partial enlarged view of point C; Figure 7 It is a three-dimensional picture of the first viewing angle when the composite mold is opened with a linkage opening and closing precision switching type; Figure 8 It is a three-dimensional image of the composite mold under the second viewing angle when the mold is opened by a linkage opening and closing precision switching type; Fig. 9 It is a three-dimensional exploded view of the fixed mold component in a linkage opening and closing precision switching composite mold; Fig.10 It is a three-dimensional exploded view of the movable mold component in a linked opening and closing precision switching composite mold.

[0019] The numbers in the figure are: 11-fixed mold seat; 111-first fixed 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-gas storage member; 171-piston ring ;172-one-way valve;21-movable mold seat;211-second fixed seat;212-second positioning strip;213-third groove;214-fourth groove;22-second driving member;23-second mold core;231-bump;2321-limiting ring;2322-second ejector;2323-spring;24-movable mold bottom plate;25-pad;26-movable mold mounting plate;27-push plate;28-first ejector;291-fixing pin;292-second spring;31-first cooling pipe;32-second cooling pipe. DETAILED DESCRIPTION

[0020] In order to further understand the features, technical means, specific objectives and functions of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0021] like Figure 1 and Figure 2 As shown, the present invention provides: a linkage opening and closing precision switching composite mold, comprising a fixed mold assembly and a movable mold assembly that open and close each other, the fixed mold assembly comprising 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, the mold opening side of the fixed mold base 11 is provided with a first injection position, and a first waiting position distributed along the circumference of 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 transmission-connected to the first mold core 13, and the first driving member 12 can push the first mold core 13 from the first waiting position to the first injection position; The movable mold assembly includes a movable mold base 21, a second driving member 22 and at least two second mold cores 23 with protrusions 231 of different shapes. The mold opening side of the movable mold base 21 is provided with a second injection position and a second waiting position distributed along the circumference of 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 movable mold base 21 and is transmission-connected 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 on the first injection position is molded with the second mold core 23 located on the second injection position to form a complete injection cavity.

[0022] The fixed mold assembly also includes a fixed mold base plate 14 and a fixed mold mounting plate 15, and the movable mold assembly also includes a movable mold base plate 24, a cushion block 25, a movable mold mounting plate 26, a fixing pin 291 and a second spring 292. The fixing pin 291 is arranged between the movable mold base plate 24 and the movable mold mounting plate 26, and the fixing pin 291 slides through the push plate 27. The second spring 292 is sleeved on the fixing pin 291, and the second spring 292 is located between the push plate 27 and the movable mold mounting plate 26.

[0023] A first cooling pipe 31 is provided in the fixed mold assembly, and a second cooling pipe 32 is provided in the movable mold assembly.

[0024] When the fixed mold assembly and the movable mold assembly are separated, the first driving member 12 can drive the first mold core 13 connected thereto to move from the first waiting position 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 position to the second injection position, so that the first mold core 13 on the first injection position and the second mold core 23 on the second injection position form a complete injection molding structure, and form a complete injection molding cavity, and inject molten material into the injection molding cavity to complete the production of the workpiece.

[0025] By switching the first mold core 13 of different shapes to move to the first injection molding position, and switching the second mold core 23 of different shapes to move to the second injection molding position, the function of producing workpieces of different shapes in the same mold can be achieved.

[0026] It should be noted that the attached Fig. 9 , 10 It is shown in the figure that there are four first mold cores 13 and four second mold cores 23, but the number of the first mold cores 13 and the second mold cores 23 can be greater than or equal to two, and the first mold cores 13 are evenly distributed around the periphery of the first injection molding position.

[0027] In this embodiment, a first mold core 13 with four concave cavities 131 of different shapes is slidably set on a fixed mold base 11, and a second mold core 23 with four protrusions 231 of different shapes is slidably set on a movable 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, and 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 large movement between the overall molds, the structure is simple, and it is easy to operate, and the controllability and precision are higher.

[0028] like Figure 7 and Fig. 9 As shown, the open mold side of the fixed mold base 11 is provided with a first groove 115 and four second grooves 116 distributed along the circumference of the first groove 115, the first groove 115 forms a first injection position, the second groove 116 forms a first waiting position, the first groove 115 and the second groove 116 are connected, and the first mold core 13 is slidably arranged in the second groove 116.

[0029] Because the first groove 115 is connected to the second groove 116, when the first driving member 12 is started, the first mold core 13 in the second groove 116 can move into the first groove 115, thereby moving the first mold core 13 from the first waiting position to the first injection position, so that the first mold core 13 can form a complete injection cavity with the second mold core 23.

[0030] like Figure 7 and Fig. 9 As shown, the side wall of the second groove 116 is provided with a first positioning strip 112 extending along the sliding direction of the first mold core 13, and first sliding grooves are provided on both sides of the first mold core 13. The first positioning strip 112 is slidably matched with the first sliding groove, so that the first sliding groove on the side of the first mold core 13 can slide stably with the first positioning strip 112, thereby preventing the first mold core 13 from withdrawing from the first groove 115 and the second groove 116.

[0031] A first stepped groove is provided on the side of the second groove 116 , a first fixing seat 111 is provided on the first stepped groove, the first fixing strip is fixed on the first stepped groove by bolts, and a first positioning strip 112 is provided on the side of the first fixing seat 111 to facilitate sliding the first mold core 13 in the second groove 116 .

[0032] like Fig. 9 As shown, the first groove 115 is located at the center of the mold opening side of the fixed mold base 11, and the second groove 116 is distributed on the outside of the first groove 115 in the longitudinal and transverse directions. A first step groove is arranged on the side of the second groove 116, and the first fixed seat 111 is fixedly installed on the first step groove by bolts. A first positioning strip 112 extending along its length direction is arranged on the outside of the first fixed seat 111, so that the first mold core 13 can be installed in the second groove to prevent the first mold core 13 from falling off.

[0033] like Figure 8 and Fig.10 As shown, the open mold side of the movable mold base 21 is provided with a third groove 213 and a fourth groove 214 distributed along the circumference of the third groove 213, the third groove 213 forms a second injection position, the fourth groove 214 forms a second waiting position, the third groove 213 and the fourth groove 214 are connected, and the second mold core 23 is slidably arranged in the fourth groove 214.

[0034] Because the third groove 213 is connected to the fourth groove 214, when the second driving member 22 is started, the second mold core 23 in the fourth groove 214 can move to the third groove 213, thereby moving the second mold core 23 from the second waiting position to the second injection position, so that the second mold core 23 can form a complete injection cavity with the first mold core 13.

[0035] like Figure 8 and Fig.10 As shown, the side wall of the fourth groove 214 is provided with a second positioning strip 212 extending along the sliding direction of the second mold core 23, and the second mold core 23 is provided with a second slide groove on both sides, and the second positioning strip 212 is slidably matched with the second slide groove.

[0036] A second stepped groove is provided on the side of the fourth groove 214, a second fixed seat 211 is provided on the second stepped groove, the second fixed strip is fixed to the second stepped groove by bolts, and a second positioning strip 212 is provided on the side of the second fixed seat 211 to facilitate sliding the second mold core 23 in the fourth groove 214.

[0037] In order 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 slide groove on the side 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.

[0038] like Figure 3 As shown, the first driving member 12 is a first cylinder, which is arranged on the outer side of the fixed mold base 11. The output shaft of the first cylinder passes through the fixed mold base 11 and is fixedly connected to the first mold core 13. The fixed mold assembly also includes an injection nozzle 16 and an air storage member 17. The injection nozzle 16 passes through the fixed mold base 11 and is connected to the first injection position. The first mold core 13 is provided with an injection channel 132 that can be connected to the injection nozzle 16; 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 station, and the gas storage component 17 is connected to the air flow channel 113; when the first mold core 13 is located at the first injection position, the injection nozzle 16 is connected to the injection channel 132; in the process of the first mold core 13 moving from the first injection position to the first waiting station, the gas storage component 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 station, the injection channel 132 is connected to the air flow channel 113.

[0039] When the first cylinder is started, the output shaft of the first 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 connected 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 molded together, the molten material flows into the molding cavity through the injection nozzle 16 and the injection channel 132 to form a workpiece.

[0040] When the first mold core 13 of the first injection molding position is switched, the output shaft of the first cylinder drives the first mold core 13 of the first injection molding position to move to the first waiting position. During this process, the gas storage component 17 accumulates gas and injects it into the closed air flow channel 113. 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 be connected with the air flow channel 113, so that the pressurized air in the air flow channel 113 quickly passes through the injection channel 132, so as to clean the injection channel 132 and prevent the material from being blocked in the injection channel 132 and making it impossible to perform the next injection molding operation.

[0041] like Figure 4 and Figure 5 As shown, the air storage component 17 includes a piston ring 171 and a one-way valve 172. A plug cavity 114 is also provided 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 is connected to the air flow channel 113. The piston ring 171 is coaxially slidably arranged in the plug cavity 114. The output shaft of the first cylinder passes through the piston ring 171 and is fixedly connected thereto. The one-way valve 172 passes 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 toward the first waiting position, the pressure in the air flow channel 113 increases.

[0042] It should be noted that the one-way valve 172 can only allow outside air to enter the airflow channel 113, while the air in the airflow channel 113 cannot escape out through the one-way valve 172. Figure 4 As shown, when the piston ring 171 moves upward, the pressure on the upper part of the piston ring 171 increases, thereby increasing the pressure of the air flow channel 113 connected thereto.

[0043] The one-way valve 172 is a prior art and will not be introduced here.

[0044] The airflow channel 113 has a first transverse section 1131, a longitudinal section 1132 and a second transverse section 1133 which are connected in sequence. The left end of the first transverse section 1131 is connected to the plug cavity 114, and the right end of the first transverse section 1131 passes through the fixed mold seat 11 to facilitate the opening of the channel. A plug 1134 is provided at the right end of the first transverse section 1131, and the one-way valve 172 passes through the fixed mold seat 11 and is connected to the first transverse section 1131. The left end of the second transverse section 1133 is connected to the first waiting station, and the longitudinal section 1132 connects the first transverse section 1131 and the second transverse section 1133.

[0045] When the output shaft of the first cylinder drives the piston ring 171 to move toward the outer end of the plug cavity 114, external ventilation 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 toward 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 position. The air flow channel 113 is connected with the injection channel 132 of the first mold core 13, and the pressurized gas in the air flow channel 113 is discharged outward through the injection channel 132, thereby preventing the material in the injection channel 132 from being blocked.

[0046] like Figure 3 and Figure 6 As shown, the movable mold assembly also includes a push plate 27, and a first ejector pin 28 arranged on the push rod. The first ejector pin 28 slides through the second injection position on the movable mold base 21. The second mold core 23 is also provided with an ejector piece that can be connected with the first ejector pin 28. When the second mold core 23 is located at the second injection position, the first ejector pin 28 can push the ejector piece to push the workpiece out of the second mold core 23.

[0047] When the push plate 27 drives the first ejector pin 28 to move in the movable mold base 21 , the first ejector pin 28 penetrates the second injection position and abuts against the ejector member, so that the ejector member can eject the workpiece on the second mold core 23 , thereby completing the separation of the workpiece and the second mold core 23 .

[0048] like Figure 6 As shown, the second mold core 23 is 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 in sequence, and 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 needle body of the second ejector pin 2322 slides 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 needle body of the first ejector pin 28, and the inner diameter of the right side is smaller than the diameter of the head of the second ejector pin 2322; a step 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 needle body and the step surface.

[0049] The limiting ring 2321 can prevent the second ejector 2322 from separating from the first mold core 13 under the action of the first spring 2323. When the second mold core 23 at the second waiting position moves to the second injection position, the first ejector 28 is coaxial with the second ejector 2322. When the push plate 27 drives the first ejector 28 to move, the first ejector 28 passes through the limiting ring 2321 and abuts against the head of the second ejector 2322, so that the second ejector 2322 overcomes the elastic force of the first spring 2323 and slides in the second mold core 23. The needle body of the second ejector 2322 can push the workpiece on the second mold core 23 away from the second mold core 23, thereby completing the demolding of the workpiece.

[0050] An injection molding machine comprises a linkage opening and closing precision switching composite mold.

[0051] The above embodiments only express one or several implementation modes of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that, for those of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the attached claims.

Claims

1. A linkage opening and closing precision switching composite mold, comprising a fixed mold component and a movable mold component that open and close each other, characterized in that: The fixed mold assembly comprises a fixed mold base (11), a first driving member (12), and at least two first mold cores (13) having concave cavities (131) of different shapes; a first injection position and a first waiting position distributed along the circumference of the first injection position are arranged on the mold opening side of the fixed mold base (11); 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 transmission-connected to 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 movable mold assembly comprises a movable mold base (21), a second driving member (2 2) and at least two second mold cores (23) having protrusions (231) of different shapes, the mold opening side of the movable mold base (21) is provided with a second injection position, and second waiting positions distributed along the circumference of 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 movable mold base (21) and is transmission-connected to 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, and the first mold core (13) located on the first injection position and the second mold core (23) located on the second injection position are molded together to form a complete injection cavity.

2. The linkage opening and closing precision switching composite mold according to claim 1 is characterized in that: The mold opening side of the fixed mold base (11) is provided with a first groove (115), and second grooves (116) distributed along the circumference of the first groove (115); the first groove (115) forms a first injection position, the second groove (116) forms a first waiting position, the first groove (115) and the second groove (116) are connected, and the first mold core (13) is slidably arranged in the second groove (116).

3. The linkage opening and closing precision switching composite mold according to claim 2 is characterized in that: The side wall of the second groove (116) is provided with a first positioning strip (112) extending along the sliding direction of the first mold core (13), and first sliding grooves are provided on both sides of the first mold core (13), and the first positioning strip (112) is slidably matched with the first sliding grooves.

4. The linkage opening and closing precision switching composite mold according to claim 1 is characterized in that: The mold opening side of the movable mold base (21) is provided with a third groove (213), and a fourth groove (214) distributed along the circumference of the third groove (213); the third groove (213) forms a second injection position, and the fourth groove (214) forms a second waiting position; the third groove (213) and the fourth groove (214) are connected, and the second mold core (23) is slidably arranged in the fourth groove (214).

5. The linkage opening and closing precision switching composite mold according to claim 4 is characterized in that: The side wall of the fourth groove (214) is provided with a second positioning strip (212) extending along the sliding direction of the second mold core (23), and second sliding grooves are provided on both sides of the second mold core (23), and the second positioning strip (212) is slidably matched with the second sliding grooves.

6. A linkage opening and closing precision switching composite mold according to claim 2 or 3, characterized in that: The first driving member (12) is a first cylinder, which is arranged on the outside of the fixed mold base (11); the output shaft of the first cylinder passes through the fixed mold base (11) and is fixedly connected to the first mold core (13); the fixed mold assembly further comprises an injection nozzle (16) and an air storage member (17); the injection nozzle (16) passes through the fixed mold base (11) and is connected to the first injection position; the first mold core (13) is provided with an injection channel (132) which can be connected to the injection nozzle (16); 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 gas storage component (17) is in communication with the air flow channel (113); when the first mold core (13) is located at the first injection position, the injection nozzle (16) is in communication with the injection channel (132); in the process of the first mold core (13) moving from the first injection position to the first waiting position, the gas storage component (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 in communication with the air flow channel (113).

7. The linkage opening and closing precision switching composite mold according to claim 6 is characterized in that: The gas storage member (17) comprises a piston ring (171) and a one-way valve (172); a plug cavity (114) is further provided 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) is communicated with the air flow channel (113); the piston ring (171) is coaxially slidably arranged in the plug cavity (114); the output shaft of the first cylinder passes through the piston ring (171) and is fixedly connected thereto; the one-way valve (172) passes 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 toward the first waiting position, the pressure in the air flow channel (113) increases.

8. A linkage opening and closing precision switching composite mold according to any one of claims 2-5 and 7, characterized in that: The movable mold assembly further comprises a push plate (27) and a first ejector pin (28) arranged on the push rod, wherein the first ejector pin (28) slides through the second injection position on the movable mold base (21), and the second mold core (23) is further provided with an ejector piece that can be connected with the first ejector pin (28). When the second mold core (23) is located at the second injection position, the first ejector pin (28) can push the ejector piece to push the workpiece out of the second mold core (23).

9. The linkage opening and closing precision switching composite mold according to claim 8, characterized in that: The second mold core (23) is provided with a first circular groove, a second circular groove and a third circular groove with gradually decreasing diameters from the inner side to the outer side thereof, and the ejector member comprises a limiting ring (2321), a second ejector pin (2322) and a first spring (2323), wherein 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 needle body of the second ejector pin (2322) slides through the third circular groove, the inner hole of the limiting ring (2321) is a conical hole, and the inner diameter of the left side of the conical hole is larger than the diameter of the needle 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 needle body and the stepped surface.

10. An injection molding machine, characterized in that: It comprises a linked opening and closing precision switching composite mold as described in any one of claims 1-5, 7, and 9.

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