Two-time ejection mold structure

Abstract

The invention relates to a secondary ejection mold structure, and relates to the technical field of injection molds, the secondary ejection mold structure comprises a mold top plate, and one side of the mold top plate is sequentially connected with a mold plate A, a mold plate B and a mold bottom plate structure; through the special mold secondary ejection structure, the flat ejector pin which is easy to burn out only participates in short-distance ejection of the first section, other ejection mechanisms continue to normally eject the second section, frequent long-distance movement of the flat ejector pin is avoided, the risk that the flat ejector pin is burnt out is reduced, the ejection structure only needs two ejector pin plates, the structure is simple, the cost is low, and the production efficiency is high. The secondary ejection function is achieved on the premise that the tonnage of the ejector plate and the tonnage of an injection molding machine are not increased, so that the mold manufacturing cost and the injection molding cost are reduced, the ejection length can be adjusted by adjusting the ejection length distance, loss generated in the injection molding ejection process can be compensated, and the mold production cost is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of injection molds, and in particular to a secondary ejection mold structure. Background Art

[0002] Plastic molds are tools used in the plastic processing industry to match plastic molding machines and give plastic products complete configurations and precise dimensions. Due to the wide variety of plastics and processing methods, and the varying structures of plastic molding machines and plastic products, there are also many types and structures of plastic molds.

[0003] In order to meet the functionality of the product, some plastic products need to be designed with a deep frame structure, and the ejection of the deep frame is usually achieved by setting a flat ejector pin on the mold.

[0004] In actual production, in order to ensure that the product is fully ejected and meets the production requirements of the robot to pick up the parts, the ejection distance of the product will be much greater than the bone depth. However, the thin flat ejector will be burned due to deformation under the production conditions of long-term and long-distance ejection and resetting, which will affect production efficiency and increase maintenance costs. According to factory experience, some deep bone positions in plastic products only need to be ejected a short distance to create a gap between them and the mold to achieve a non-stick mold effect. It is not necessary to eject a distance greater than the depth of the bone position. Therefore, it is necessary to improve and optimize the mold structure to solve this problem.

[0005] Therefore, in view of the above-mentioned related technical problems, a secondary ejection mold structure is proposed. Summary of the invention

[0006] In order to improve the above problems, the present application provides a secondary ejection mold structure.

[0007] The present application provides a secondary ejection mold structure, which adopts the following technical solution: A secondary ejection mold structure comprises a mold top plate, one side of which is sequentially connected to a mold A plate, a mold B plate and a mold bottom plate structure, a front mold core is arranged in the mold A plate, and a rear mold core is arranged in the mold B plate, the front mold core and the rear mold core are fitted together, and two sets of finished products are injection molded and die-casted between the front mold core and the rear mold core; Among them, the mold bottom plate structure is provided with an accommodating cavity, and the accommodating cavity is provided with an ejector panel and an ejector bottom plate, a plurality of groups of round ejector pins are arranged between the ejector bottom plate and the mold A plate, and a plurality of groups of flat ejector pin assemblies are arranged between the mold bottom plate structure and the mold A plate; the mold top plate is connected to the injection molding and stamping devices, and the mold bottom plate structure is connected to the mechanical equipment for demolding and ejection. During the injection molding process, the finished product is formed between the front mold core in the mold A plate and the rear mold core in the mold B plate, and the ejector panel and the ejector bottom plate in the accommodating cavity are driven by the mold bottom plate structure, and the ejection function is realized by the movement of the ejector panel and the ejector bottom plate.

[0008] Preferably, a groove having the same shape as that of a finished product is formed between the front mold core and the rear mold core, the finished product is a hollow chamfered rectangle, and a plurality of groups of deep bone protrusions are provided on a side of the finished product close to the rear mold core.

[0009] By adopting the above technical solution, the finished product is formed between the front mold core and the rear mold core through the mold closing of the front mold core and the rear mold core, and multiple groups of deep bone protrusions are formed on one side of the finished product after molding.

[0010] Preferably, the flat ejector assembly comprises a cushion block and a flat ejector, and an ejector spring is connected between the cushion block and the mold bottom plate structure, an ejector sleeve is connected to a side of the cushion block away from the ejector spring, and the flat ejector is connected in the ejector sleeve.

[0011] By adopting the above technical scheme, the cushion block moves on the mold bottom plate structure through the ejector spring, and the flat ejector is driven to perform the ejection action by the force of the spring. During the movement, the ejector sleeve is used to limit the ejection distance of the flat ejector. During the injection molding process, the flat ejector is pressed on the cushion block, and the bottom of the cushion block just touches the mold bottom plate structure to ensure that the flat ejector will not retreat due to the injection pressure in the mold closing state. The distance between the ejector sleeve and the mold B plate is the ejector stroke. The distance between the ejector sleeve and the mold B plate can be adjusted by adjusting the telescopic length of the ejector sleeve, thereby changing the stroke distance of the flat ejector assembly and further adjusting the ejection distance.

[0012] Preferably, a flat ejector head is provided on the top of the flat ejector, one end of multiple groups of flat ejector assemblies are connected to the deep bone protrusion, and the multiple groups of round ejector pins are arranged in a path array with the midline of the inner diameter and outer diameter of the finished product, and multiple groups of limit columns are provided in the accommodating cavity, and the limit columns and the ejector sleeve are connected to a lifting screw at one end close to the mold bottom plate structure.

[0013] By adopting the above technical solution, the limiting column and the ejector sleeve are respectively lifted and lowered by their respective lifting screws, and during the injection molding process, the flat ejector head at the top of the flat ejector acts with the front mold core and the rear mold core to form a deep bone protrusion.

[0014] Preferably, an injection molding connection block is provided on the mold top plate, and an injection molding groove is provided at the center position of the injection molding connection block, and two groups of mutually centrally symmetrical tube grooves are provided in the front mold core, and the two groups of tube grooves extend to one side of two groups of finished products respectively.

[0015] By adopting the above technical solution, the molten plastic material is injected from the injection groove on the injection connecting block, and is respectively sent into the two groups of grooves formed between the front mold core and the rear mold core through two groups of pipe grooves, thereby forming a finished product between the front mold core and the rear mold core, and two groups of finished products can be produced at the same time.

[0016] Preferably, a plurality of groups of first guide pillars are arranged between the mold bottom plate structure and the mold B plate, the limit pillars are arranged between the ejector panel and the mold B plate, and a plurality of groups of second guide pillars are connected between the mold A plate and the mold B plate.

[0017] By adopting the above technical scheme, the movement, extension, and limiting actions of mold A plate, mold B plate and mold bottom plate structure are existing mature technologies, and mold A plate, mold B plate and mold bottom plate structure slide through the first guide column, and mold A plate and mold B plate slide through the second guide column. The gap between the limiting column and mold B plate is the ejector stroke, and the gap between the limiting column and mold B plate can be changed by adjusting the extension and contraction height of the limiting column, thereby changing the stroke distance of the dome ejector stroke, and then adjusting the length of the secondary ejection.

[0018] Preferably, a plurality of groups of return pins are connected between the ejector bottom plate and the front mold core, and the outer sides of the return pins are connected with support springs, and the support springs are arranged between the rear mold core and the ejector panel.

[0019] By adopting the above technical solution, multiple sets of return pins and the supporting springs connected thereto constitute a return pin system, which can improve material utilization and the integrity of the injection molded product, reduce bubbles and shrinkage marks, and improve production efficiency. Through the return pins and supporting springs, excess plastic in the injection molding process is redirected back into the barrel, so that the hollow parts between the front mold core, the rear mold core and the finished product can be filled, thereby ensuring the integrity and quality of the injection molded product.

[0020] Preferably, a plurality of adjustment connectors are provided on the side of the mold base structure away from the accommodating cavity, and a synchronous transmission chassis is provided on the end of the adjustment connector close to the mold base structure, and a plurality of lifting connection blocks are provided on the outside of the synchronous transmission chassis, and the lifting screw rod is inserted in the lifting connection block.

[0021] By adopting the above technical solution, since the mold will inevitably produce friction loss during use, which will cause errors in the injection molded parts and lead to insufficient precision of the parts, and replacing the mold when the mold is worn will greatly increase the production cost. The stroke of the flat ejector pin assembly and the round ejector pin can be adjusted to adjust the ejection distance to compensate for the production loss, and the ejection length can be adjusted according to the needs of the production parts. When adjusting the stroke of the flat ejector pin assembly and the round ejector pin, the mold can be removed, and the adjustment connector can be connected to the motor, and the adjustment stroke can be made more accurate through a precision motor.

[0022] Preferably, a transmission shaft is connected between the synchronous transmission chassis and the lifting connection block, and the transmission shaft and the adjustment connection head are meshed with each other through a bevel gear set in the synchronous transmission chassis.

[0023] By adopting the above technical solution, the adjusting connector drives the transmission shaft to rotate through the bevel gear set in the synchronous transmission chassis, and the lifting connecting block connected to the synchronous transmission chassis is a component under the same finished product, so as to realize synchronous and precise lifting and lowering movement, thereby making the adjustment accuracy more precise.

[0024] Preferably, a threaded rod is provided at one end of the transmission shaft close to the lifting connection block, a transmission threaded seat is provided in the lifting connection block, and threads are provided on the inner and outer sides of the transmission threaded seat, and the transmission threaded seat is meshed with the lifting screw rod and the threaded rod.

[0025] By adopting the above technical solution, the transmission shaft drives the transmission threaded seat to rotate through the threaded rod during the rotation process, and the transmission threaded seat drives the lifting screw rod to move up and down through the thread during the rotation process, thereby driving the ejector sleeve or limit column connected to the lifting screw rod to move up and down.

[0026] 1. Compared with the prior art, the mold structure of secondary ejection, through a special mold secondary ejection structure, realizes that the flat ejector pin that is easy to burn only participates in the first short distance ejection (3-5mm), and the other ejection mechanisms continue the normal ejection function of the second section, avoiding the frequent long-distance movement of the flat ejector pin and reducing the risk of burning the flat ejector pin. In the ejection state, the ejector panel 6 and the ejector bottom plate 7 move under the action of the ejector rod of the injection molding machine. In the mold closing state, the cushion block moves on the mold bottom plate structure through the ejector spring, and the flat ejector pin is driven to perform the ejection action through the force of the ejector spring. During the movement, the ejector sleeve is used to limit the ejection distance of the flat ejector pin. During the injection molding process, the flat ejector pin is pressed on the cushion block, and the bottom of the cushion block just touches the mold bottom plate structure, ensuring that the flat ejector pin will not retreat due to the injection pressure in the mold closing state, and the spacing between the ejector sleeve and the mold B plate is the stroke of the flat ejector pin assembly, and the gap between the limit column and the mold B plate is the round ejector pin stroke.

[0027] 2. Compared with the prior art, the mold structure of the secondary ejection only needs two ejector plates for the ejection structure, and the structure is simple. It realizes the function of secondary ejection without increasing the ejector plate and the tonnage of the injection molding machine, thereby reducing the mold manufacturing cost and the injection molding cost. The round ejector pin is driven by the ejector panel to eject the product. At the same time, the flat ejector pin assembly drives the flat ejector pin to perform an ejection action to eject the product through the force of the ejector pin spring, and ejects the stroke of the flat ejector pin assembly. When the ejector pin sleeve hits the mold B plate, the flat ejector pin stops moving due to the obstruction of the mold B plate, and this is the first ejection action of the mold. The flat ejector pin stops ejecting due to the limit of the ejector pin sleeve, while the remaining round ejector pins continue to eject without restriction. When the ejection distance reaches the round ejector pin stroke and when the limit column hits the mold B plate, the round ejector pin stops moving, and the second ejection action of the mold is completed.

[0028] 3. Compared with the prior art, this secondary ejection mold structure can adjust the ejection length by adjusting the ejection length distance, and can compensate for the loss generated in the injection molding ejection process to reduce the production mold cost. Since the mold will inevitably produce friction loss during use, it will cause errors in the injection molded parts, resulting in insufficient precision of the parts. When the mold is worn, replacing the mold will greatly increase the production cost. The ejection distance can be adjusted by adjusting the stroke of the flat ejector pin assembly and the round ejector pin to compensate for the production loss, and the ejection length can be adjusted according to the needs of the production parts. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the structure of the main body of this application; Figure 2 This is a schematic diagram of the structure of the main body of this application; Figure 3 This is a schematic diagram of the structure of the injection molding connection block of the present application; Figure 4 This is a schematic diagram of the structure of the finished product of this application; Figure 5 It is a structural schematic diagram of the central section of the main body of this application; Figure 6 This is a schematic diagram of the structure of the flat ejector pin assembly of the present application; Figure 7 It is a structural schematic diagram of a partial cross section of the rotating body of the present application; Figure 8 This is a schematic diagram of the structure of the limit column of the present application; Fig. 9 This is a schematic diagram of the structure of the mold bottom plate of the present application; Fig.10 This is a structural schematic diagram of the synchronous transmission chassis of the present application; Fig.11 This is a schematic structural diagram of a cross section of the synchronous transmission chassis of the present application.

[0030] The accompanying drawings are marked as follows: 1. mold top plate; 11. injection molding connecting block; 111. injection molding groove; 112. tube groove; 12. round ejector pin; 13. flat ejector pin assembly; 131. cushion block; 132. ejector pin sleeve; 133. flat ejector pin; 134. flat ejector pin head; 135. ejector pin spring; 14. limit column; 141. lifting screw rod; 15. return pin; 151. support spring; 16. first guide column; 17. second guide column; 2. mold A plate; 21. front mold core; 3. mold B plate; 31. rear mold core; 4. mold bottom plate structure; 41. adjustment connector; 42. synchronous transmission chassis; 421. transmission shaft; 422. threaded rod; 43. lifting connecting block; 431. transmission threaded seat; 5. accommodating cavity; 6. ejector pin panel; 7. ejector pin bottom plate; 8. finished product; 81. deep bone protrusion. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0032] The following is combined with Figure 1-Figure 11 , further details of this application are given.

[0033] A secondary ejection mold structure, comprising a mold top plate 1, referring to Figure 1 and Figure 2 as well as Figure 3 A mold A plate 2, a mold B plate 3 and a mold bottom plate structure 4 are sequentially connected to one side of the mold top plate 1. A front mold core 21 is arranged in the mold A plate 2, and a rear mold core 31 is arranged in the mold B plate 3. The front mold core 21 fits the rear mold core 31, and two groups of finished products 8 are injection-molded and die-casted between the front mold core 21 and the rear mold core 31. Among them, a accommodating cavity 5 is arranged in the mold bottom plate structure 4, and an ejector panel 6 and an ejector bottom plate 7 are arranged in the accommodating cavity 5, a plurality of groups of round ejector pins 12 are arranged between the ejector bottom plate 7 and the mold A plate 2, and a plurality of groups of flat ejector pin assemblies 13 are arranged between the mold bottom plate structure 4 and the mold A plate 2; the mold top plate 1 is connected to the injection molding and stamping devices, and the mold bottom plate structure 4 is connected to the mechanical equipment for demolding and ejection. During the injection molding process, the finished product 8 is formed between the front mold core 21 in the mold A plate 2 and the rear mold core 31 in the mold B plate 3, and the ejector panel 6 and the ejector bottom plate 7 in the accommodating cavity 5 are driven by the mold bottom plate structure 4, and the ejection function is realized by the movement of the ejector panel 6 and the ejector bottom plate 7.

[0034] Reference Figure 3 and Figure 4 A groove having the same shape as that of the finished product 8 is formed between the front mold core 21 and the rear mold core 31. The finished product 8 is a hollow chamfered rectangle, and a plurality of groups of deep bone protrusions 81 are provided on the side of the finished product 8 close to the rear mold core 31; by closing the front mold core 21 and the rear mold core 31, the finished product 8 is formed between the front mold core 21 and the rear mold core 31, and a plurality of groups of deep bone protrusions 81 are formed on one side of the finished product 8 after forming, and the deep bone protrusions 81 are the product of secondary ejection of the mold.

[0035] Reference Figure 3 and Figure 6 The flat ejector assembly 13 includes a cushion block 131 and a flat ejector 133, and an ejector spring 135 is connected between the cushion block 131 and the mold bottom plate structure 4, and an ejector sleeve 132 is connected to the side of the cushion block 131 away from the ejector spring 135, and the flat ejector 133 is connected in the ejector sleeve 132; the cushion block 131 moves on the mold bottom plate structure 4 through the ejector spring 135, and drives the flat ejector 133 to perform an ejection action through the action of the spring, and during the movement, the ejector sleeve 132 is used to limit the ejection distance of the flat ejector 133. During the injection molding process, the flat ejector 133 is pressed on the cushion block 131, and the cushion block The bottom of 131 just touches the mold bottom plate structure 4, ensuring that the flat ejector pin 133 will not retreat due to the injection pressure in the mold closing state, and the distance between the ejector pin sleeve 132 and the mold B plate 3 is the stroke of the flat ejector pin assembly 13. The distance between the ejector pin sleeve 132 and the mold B plate 3 can be adjusted by adjusting the telescopic length of the ejector pin sleeve 132, thereby changing the stroke distance of the flat ejector pin assembly 13, and then adjusting the ejection distance. The flat ejector pin assembly 13 only participates in the first short-distance ejection (3-5mm), avoiding frequent long-distance movement of the flat ejector pin and reducing the risk of burning the flat ejector pin.

[0036] Reference Figure 3 and Figure 6 as well as Figure 8A flat ejector pin head 134 is provided at the top of the flat ejector pin 133, one end of the multiple groups of flat ejector pin assemblies 13 is connected to the deep bone protrusion 81, and the multiple groups of dome ejector pins 12 are arranged in a path array with the midline of the inner diameter and the outer diameter of the finished product 8, and multiple groups of limiting columns 14 are provided in the accommodating cavity 5, and the limiting columns 14 and the ejector pin sleeve 132 are connected to the end close to the mold bottom plate structure 4 with a lifting screw 141; during the injection molding process, the flat ejector pin head 134 at the top of the flat ejector pin 133 and the front mold core 21 and the rear mold core 31 act to form the deep bone protrusion 81, the limiting column 14 and the ejector pin sleeve 132 are respectively lifted and lowered by their respective lifting screws 141, and the gap between the limiting column 14 and the mold B plate 3 is the stroke of the dome ejector pin 12, and the gap between the limiting column 14 and the mold B plate 3 can be adjusted by adjusting the telescopic height of the limiting column 14, thereby adjusting the stroke length of the dome ejector pin 12, and then adjusting the length of the secondary ejection.

[0037] Reference Figure 3 and Figure 5 An injection molding connection block 11 is provided on the mold top plate 1, and an injection molding groove 111 is provided at the center position of the injection molding connection block 11, and two groups of mutually centrally symmetrical tube grooves 112 are provided in the front mold core 21, and the two groups of tube grooves 112 extend to one side of the two groups of finished products 8 respectively; the molten plastic material is injected from the injection molding groove 111 on the injection molding connection block 11, and is respectively sent into the two groups of grooves formed between the front mold core 21 and the rear mold core 31 through the two groups of tube grooves, thereby forming a finished product 8 between the front mold core 21 and the rear mold core 31, and two groups of finished products 8 can be produced at the same time.

[0038] Reference Figure 2 and Figure 7 , multiple groups of first guide pillars 16 are arranged between the mold bottom plate structure 4 and the mold B plate 3, the limiting pillars 14 are arranged between the ejector panel 6 and the mold B plate 3, and multiple groups of second guide pillars 17 are connected between the mold A plate 2 and the mold B plate 3; the movement, extension and limiting actions of the mold A plate 2, the mold B plate 3 and the mold bottom plate structure 4 are existing mature technologies, and the mold A plate 2 and the mold B plate 3 slide with the mold bottom plate structure 4 through the first guide pillars 16, and the mold A plate 2 and the mold B plate 3 slide through the second guide pillars 17.

[0039] Reference Figure 7A plurality of return pins 15 are connected between the ejector base plate 7 and the front mold core 21, and a support spring 151 is connected to the outer side of the return pin 15, and the support spring 151 is arranged between the rear mold core 31 and the ejector panel 6; a plurality of return pins 15 and the support springs 151 connected thereto constitute a return pin system, which can improve material utilization and the integrity of the injection molded product, and can also reduce bubbles and shrinkage marks, and improve production efficiency. Through the return pins 15 and the support springs 151, the excess plastic in the injection molding process is redirected back to the barrel, so that the hollow part between the front mold core 21, the rear mold core 31 and the finished product 8 can be filled, and the integrity and quality of the injection molded product are ensured.

[0040] Reference Fig. 9 and Fig.10 , a plurality of adjusting connectors 41 are arranged on one side of the mold bottom plate structure 4 away from the accommodating cavity 5, and a synchronous transmission chassis 42 is arranged on the adjusting connector 41 near the end where the mold bottom plate structure 4 is arranged, and a plurality of lifting connecting blocks 43 are arranged on the outer side of the synchronous transmission chassis 42, and the lifting screw rod 141 is inserted into the lifting connecting block 43; since the mold will inevitably produce friction loss during use, which will cause errors in the injected parts, resulting in insufficient precision of the parts, and replacing the mold when the mold is worn will greatly increase the production cost, the production loss can be compensated by adjusting the stroke of the flat ejector pin assembly 13 and the round ejector pin 12, thereby adjusting the ejection distance, and the ejection length can be adjusted according to the needs of the production parts. When adjusting the stroke of the flat ejector pin assembly 13 and the round ejector pin 12, the mold can be removed, and the adjusting connector 41 can be connected to the motor, and the adjustment stroke can be made more accurate through the precise motor drive.

[0041] Reference Fig.10 and Fig.11 A transmission shaft 421 is connected between the synchronous transmission chassis 42 and the lifting connection block 43, and the transmission shaft 421 and the adjustment connection head 41 are meshed with each other through a bevel gear set in the synchronous transmission chassis 42; the adjustment connection head 41 drives the transmission shaft 421 to rotate through the bevel gear set in the synchronous transmission chassis 42, and the lifting connection block 43 connected to the synchronous transmission chassis 42 is a component under the same finished product 8, so as to realize synchronous and precise lifting and lowering movement, thereby making the adjustment accuracy more accurate.

[0042] Reference Fig.10 and Fig.11A threaded rod 422 is provided at one end of the transmission shaft 421 close to the lifting connection block 43, a transmission threaded seat 431 is provided in the lifting connection block 43, and threads are provided on the inner and outer sides of the transmission threaded seat 431, and the transmission threaded seat 431 is meshed with the lifting screw rod 141 and the threaded rod 422; during the rotation of the transmission shaft 421, the transmission threaded seat 431 is driven to rotate through the threaded rod 422, and during the rotation of the transmission threaded seat 431, the lifting screw rod 141 is driven to move up and down in the lifting connection block 43 through the threads, thereby driving the ejector sleeve 132 or the limit column 14 connected to the lifting screw rod 141 to move up and down.

[0043] The working process of the present application is as follows: first, the mold top plate 1 is connected to the injection molding and stamping devices, and the mold bottom plate structure 4 is connected to the mechanical equipment for demoulding and ejection, and the melted plastic material is injected from the injection molding groove 111 on the injection molding connection block 11, and is respectively sent into the two groups of grooves formed between the front mold core 21 and the rear mold core 31 through the two groups of pipe grooves 112, and the mold A plate 2 and the mold B plate 3 slide with the mold bottom plate structure 4 through the first guide column 16 through the hydraulic equipment, and the mold A plate 2 and the mold B plate 3 slide through the second guide column 17, and the excess plastic in the injection molding process can be guided back to the barrel through the return needle 15 and the support spring 151, so that the hollow part between the front mold core 21 and the rear mold core 31 and the finished product 8 can be filled, and the integrity and quality of the injection molded product can be ensured, and the material utilization rate can be improved, and the integrity of the injection molded product can be improved, and bubbles and shrinkage marks can be reduced, and production efficiency can be improved; Secondly, in the mold closing state, the cushion block 131 moves on the mold bottom plate structure 4 through the ejector spring 135, and the flat ejector 133 is driven to perform an ejection action by the force of the ejector spring 135. In the process of moving, the ejector sleeve 132 is used to limit the ejection distance of the flat ejector 133. In the injection process, the flat ejector 133 is pressed on the cushion block 131, and the bottom of the cushion block 131 just touches the mold bottom plate structure 4, ensuring that the flat ejector 133 will not retreat due to the injection pressure in the mold closing state, and the distance between the ejector sleeve 132 and the mold B plate 3 is the stroke of the flat ejector assembly 13, and the gap between the limit column 14 and the mold B plate 3 is the stroke of the round ejector 12; In the ejection state, the ejector panel 6 and the ejector bottom plate 7 move under the action of the ejector rod of the injection molding machine, and the round ejector pin 12 is driven by the ejector panel 6 to eject the finished product 8. At the same time, the flat ejector assembly 13 drives the flat ejector pin 133 to perform an ejection action to eject the product through the action of the ejector spring 135, and ejects the stroke of the flat ejector assembly 13. When the ejector sleeve 132 hits the mold B plate 3, the flat ejector pin 133 stops moving due to the obstruction of the mold B plate 3. This is the first ejection action of the mold, and the flat ejector pin 133 is stopped due to the limit of the ejector sleeve 132. The ejection action is stopped, while the remaining dome pins 12 continue to eject without restriction. When the ejection distance reaches the stroke of the dome pin 12 and the limit column 14 hits the mold B plate 3, the dome pin 12 stops moving. At this time, the second ejection action of the mold is completed, and during the injection molding process, the flat ejector pin head 134 at the top of the flat ejector pin 133 interacts with the front mold core 21 and the rear mold core 31 to form a deep bone convex block 81, and the flat ejector pin assembly 13 only participates in the first short-distance ejection (3-5mm), avoiding frequent long-distance movement of the flat ejector pin and reducing the risk of burning the flat ejector pin; After the processing is completed, the mold will inevitably produce friction loss during use, which will cause errors in the injection molded parts, resulting in insufficient precision of the parts. When the mold is worn, replacing the mold will greatly increase the production cost. The production loss can be compensated by adjusting the stroke of the flat ejector pin assembly 13 and the round ejector pin 12, thereby adjusting the ejection distance, and the ejection length can be adjusted according to the needs of the production parts. When adjusting the stroke of the flat ejector pin assembly 13 and the round ejector pin 12, the mold can be removed, and the adjustment connector 41 can be connected to the motor, and the adjustment stroke can be made more accurate through the precise motor drive; The adjusting connector 41 drives the transmission shaft 421 to rotate through the bevel gear set in the synchronous transmission chassis 42. During the rotation of the transmission shaft 421, the transmission threaded seat 431 is driven to rotate through the threaded rod 422. During the rotation of the transmission threaded seat 431, the lifting screw rod 141 is driven to move up and down in the lifting connection block 43 through the thread, thereby driving the ejector sleeve 132 or the limit column 14 connected to the lifting screw rod 141 to move up and down. The ejector sleeve 132 and the mold are adjusted by adjusting the telescopic length of the ejector sleeve 132. The spacing between the B plates 3 can change the stroke distance of the flat ejector pin assembly 13, and then the ejection distance length can be adjusted. The gap between the limit column 14 and the mold B plate 3 can be adjusted by adjusting the telescopic height of the limit column 14, so as to adjust the stroke length of the round ejector pin 12, and then adjust the length of the secondary ejection. The lifting connection block 43 connected to the synchronous transmission chassis 42 is a component under the same finished product 8 to achieve synchronous and precise lifting and moving, so that the adjustment accuracy is more accurate. The above is the working principle of this secondary ejection mold structure.

[0044] The embodiments of this specific implementation are all preferred embodiments of the present application, and are not intended to limit the protection scope of the present application. The same components are represented by the same figure marks. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A secondary ejection mold structure, comprising a mold top plate (1), characterized in that: One side of the mold top plate (1) is connected in sequence to a mold A plate (2), a mold B plate (3) and a mold bottom plate structure (4); a front mold core (21) is arranged in the mold A plate (2), and a rear mold core (31) is arranged in the mold B plate (3); the front mold core (21) and the rear mold core (31) are fitted together, and two sets of finished products (8) are injection-molded between the front mold core (21) and the rear mold core (31); The mold bottom plate structure (4) is provided with a receiving cavity (5), and the receiving cavity (5) is provided with an ejector panel (6) and an ejector bottom plate (7), a plurality of groups of round ejector pins (12) are provided between the ejector bottom plate (7) and the mold A plate (2), and a plurality of groups of flat ejector pin assemblies (13) are provided between the mold bottom plate structure (4) and the mold A plate (2).

2. A secondary ejection mold structure according to claim 1, characterized in that: A groove having the same shape as the finished product (8) is formed between the front mold core (21) and the rear mold core (31); the finished product (8) is a hollow chamfered rectangle, and a plurality of groups of deep bone protrusions (81) are provided on a side of the finished product (8) close to the rear mold core (31).

3. A secondary ejection mold structure according to claim 2, characterized in that: The flat ejector assembly (13) comprises a cushion block (131) and a flat ejector pin (133), an ejector pin spring (135) is connected between the cushion block (131) and the mold bottom plate structure (4), an ejector pin sleeve (132) is inserted into a side of the cushion block (131) away from the ejector pin spring (135), and the flat ejector pin (133) is connected inside the ejector pin sleeve (132).

4. A secondary ejection mold structure according to claim 3, characterized in that: A flat ejector head (134) is provided at the top of the flat ejector pin (133), one end of a plurality of groups of the flat ejector pin assemblies (13) is connected to the deep bone protrusion (81), and a plurality of groups of the round ejector pins (12) are arranged in a path array with the center line of the inner diameter and the outer diameter of the finished product (8), a plurality of groups of limiting columns (14) are provided in the accommodating cavity (5), and one end of the limiting columns (14) and the ejector pin sleeve (132) close to the mold bottom plate structure (4) is connected to a lifting screw rod (141).

5. The secondary ejection mold structure according to claim 1, characterized in that: An injection molding connection block (11) is provided on the mold top plate (1), and an injection molding groove (111) is provided at the center of the injection molding connection block (11). Two groups of mutually centrally symmetrical tube grooves (112) are provided in the front mold core (21), and the two groups of tube grooves (112) extend to one side of two groups of finished products (8) respectively.

6. A secondary ejection mold structure according to claim 4, characterized in that: A plurality of groups of first guide pillars (16) are arranged between the mold bottom plate structure (4) and the mold B plate (3), the limit pillars (14) are arranged between the ejector panel (6) and the mold B plate (3), and a plurality of groups of second guide pillars (17) are connected between the mold A plate (2) and the mold B plate (3).

7. The secondary ejection mold structure according to claim 1, characterized in that: A plurality of return pins (15) are connected between the ejector base plate (7) and the front mold core (21), and the outer sides of the return pins (15) are connected to support springs (151), which are arranged between the rear mold core (31) and the ejector panel (6).

8. The secondary ejection mold structure according to claim 4, characterized in that: A plurality of sets of adjustment connectors (41) are arranged on a side of the mold base structure (4) away from the accommodating cavity (5), and a synchronous transmission case (42) is arranged on an end of the adjustment connector (41) close to the end where the mold base structure (4) is arranged, and a plurality of sets of lifting connection blocks (43) are arranged on the outside of the synchronous transmission case (42), and the lifting screw rod (141) is inserted into the lifting connection block (43).

9. A secondary ejection mold structure according to claim 8, characterized in that: A transmission shaft (421) is connected between the synchronous transmission case (42) and the lifting connection block (43), and the transmission shaft (421) and the adjustment connection head (41) are meshed with each other via a bevel gear set in the synchronous transmission case (42).

10. A secondary ejection mold structure according to claim 9, characterized in that: A threaded rod (422) is provided at one end of the transmission shaft (421) close to the lifting connection block (43); a transmission threaded seat (431) is provided inside the lifting connection block (43); threads are provided on both the inner and outer sides of the transmission threaded seat (431); and the transmission threaded seat (431) is meshed with the lifting screw rod (141) and the threaded rod (422).

Images