An injection stamping mold

Abstract

The present invention discloses an injection stamping die, specifically relating to the technical field of dies, which includes a moving die, an injection nozzle, a charging barrel, an end cover, and an injection port; a plunger coaxially disposed within the injection nozzle, with the interior of the plunger being hollow and freely sliding within the injection nozzle. One end of the plunger facing the outside of the charging barrel is coaxially provided with a tapered section, the outer diameter of the tapered section decreasing successively in the direction towards the outside of the charging barrel. A tapered hole for the tapered section to engage is formed within the injection nozzle. The mouth of the tapered section is provided with a closed portion formed by inverting the material, and a plurality of slits penetrating the closed portion are formed on the periphery of the tapered section. An outlet is formed at one end of the plunger away from the tapered section, and the outlet communicates with the interior of the plunger. By the movement of the plunger within the injection nozzle towards the moving die, the residual molten material within the injection nozzle can enter the plunger from the mouth and slits of the tapered hole of the plunger, and then enter the charging barrel from the outlet, thereby reducing the residual molten material within the injection nozzle, and making the subsequent cleaning work of the injection nozzle more convenient.

Description

Technical Field

[0001] The present invention relates to the technical field of molds, and more specifically, to an injection stamping mold. Background Art

[0002] Injection molding, also known as injection molding, is a molding method that combines injection and molding. The advantages of the injection molding method are high production speed, high efficiency, automated operation, a variety of color and pattern varieties, the shape can range from simple to complex, the size can range from large to small, and the product size is accurate, the product is easy to update, and it can form complex parts. Injection molding is suitable for forming processing fields such as mass production and complex-shaped products.

[0003] When an injection mold performs injection molding, first, the moving mold and the fixed mold are closed. After closing, the molten material is injected into the mold cavity through the injection nozzle installed on the moving mold to achieve injection molding. During the injection process, the molten material will remain in the injection nozzle. After subsequent injection molding, workers need to clean the molten material solidified in the injection nozzle, resulting in inconvenience in operation. Therefore, it is necessary to improve the injection nozzle of the existing injection mold. Summary of the Invention

[0004] In order to overcome the above-mentioned defects of the prior art, an embodiment of the present invention provides an injection stamping mold. The technical problem to be solved by the present invention is that in the prior art, when the injection nozzle of the mold performs injection molding, molten material will remain inside, resulting in the need for manual cleaning subsequently.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] An injection stamping mold includes a moving mold of the injection stamping mold, an injection nozzle is installed on the moving mold, and further includes:

[0007] A charging cylinder detachably connected to the outer wall of the moving mold, one end of the charging cylinder away from the moving mold is open and connected with an end cover, and a charging port is provided on the periphery of the charging cylinder;

[0008] A plunger coaxially passing through the injection nozzle, the inside of the plunger is hollow and freely slides in the injection nozzle. One end of the plunger facing the outside of the charging cylinder is coaxially provided with a tapered section, the outer diameter of the tapered section decreases sequentially in the direction of the outside of the charging cylinder. A tapered hole for engaging the tapered section is opened in the injection nozzle. The mouth of the tapered section is provided with a closing portion with an inward turn, and a plurality of slits penetrating the closing portion are opened on the periphery of the tapered section. An outlet is opened at one end of the plunger away from the tapered section, and the outlet communicates with the inside of the plunger.

[0009] Further, the plunger and the tapered section are an integrally formed structure and are made of spring steel material.

[0010] Further, a driving unit for driving the plunger to insert into the injection nozzle is provided on the charging cylinder.

[0011] Further, the driving unit includes a cylinder installed on the end cover. One end of the plunger facing the end cover is fixedly sleeved with a connecting arm, and the cylinder rod of the cylinder penetrates into the charging cylinder and is fixedly connected to the connecting arm.

[0012] Further, a cleaning rod is coaxially and rotatably connected to the plunger. One end of the cleaning rod penetrating into the plunger is fixedly connected with a spiral blade, and a rotating unit for driving the cleaning rod to rotate is provided on the charging cylinder.

[0013] Further, the rotating unit includes a fixed cylinder vertically penetrating through the end cover. The cleaning rod is coaxially telescopically inserted into the fixed cylinder. One end of the cleaning rod penetrating into the fixed cylinder is rotatably embedded with a ball, and a spiral rolling groove for the ball to engage is formed on the inner wall of the fixed cylinder, and the ball freely rolls in the spiral rolling groove.

[0014] Further, one end of the injection nozzle penetrating into the charging cylinder is slidably sleeved with a piston plate. A buffer space is formed between the lower end surface of the piston plate and the inner bottom wall of the charging cylinder. An elastic member is installed in the buffer space, and the elastic member elastically abuts against the piston plate upward. A top rod extending downward is fixedly connected to the lower surface of the connecting arm, and the top rod is used in cooperation with the piston plate.

[0015] Further, the elastic member is a spring wound around the injection nozzle, and the two ends of the spring in the elastic force direction elastically abut against the piston plate and the inner bottom wall of the charging cylinder respectively.

[0016] Further, a fixed plug is fixedly installed in the injection port. A plurality of through-hole-shaped communication ports are formed on the end face of the fixed plug. A movable plug is movably connected in the injection port, and the side projection area of the movable plug covers the communication ports. A sealing unit for driving the movable plug to move relative to the fixed plug is provided in the charging cylinder.

[0017] Further, the sealing unit includes a rotating shaft coaxially and rotatably connected to the fixed plug. The rotating shaft is threadedly penetrated through the movable plug. A clamping block is fixedly connected to the end face of the movable plug. A sliding groove for the clamping block to engage is provided on the inner wall of the injection port, and the clamping block freely slides in the sliding groove. A gear portion is provided at one end of the rotating shaft penetrating into the charging cylinder. A rack is fixedly connected to the connecting arm, and when the rack moves up and down, it will engage with the gear portion.

[0018] The technical effects and advantages of the present invention:

[0019] 1. By moving the plunger in the injection nozzle towards the moving mold, the residual molten material in the injection nozzle can enter the plunger through the conical hole opening and the slit of the plunger, and then enter the injection barrel through the discharge port, thereby reducing the residual molten material in the injection nozzle, making the subsequent cleaning work of the injection nozzle more convenient;

[0020] 2. By the telescopic insertion of the cleaning rod in the fixed cylinder, the ball rolls in the spiral rolling groove, thereby driving the cleaning rod to rotate. When the cleaning rod rotates, it drives the spiral blade to rotate, so that the spiral blade can make the molten material entering the plunger enter the discharge port more smoothly;

[0021] 3. By the downward movement of the connecting arm, the rack meshes with the gear part, thereby driving the rotating shaft to rotate. When the rotating shaft rotates, it drives the movable plug to move towards the fixed plug until the end faces of the fixed plug and the movable plug are in contact, so that the movable plug closes the communication port, and thus when the plunger is inserted into the injection nozzle, the external molten material cannot continue to enter the injection barrel through the injection port and then enter the injection nozzle. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic structural diagram of an injection and stamping mold in the present invention;

[0023] Figure 2 It is Figure 1 a schematic structural diagram from a side view angle;

[0024] Figure 3 It is Figure 1 a schematic structural diagram after omitting the moving mold in;

[0025] Figure 4 It is Figure 3 a schematic cross-sectional structural diagram;

[0026] Figure 5 It is a schematic structural diagram of the plunger in the present invention;

[0027] Figure 6 It is Figure 5 a schematic cross-sectional structural diagram;

[0028] Figure 7 It is a schematic cross-sectional structural diagram of the injection nozzle in the present invention;

[0029] Figure 8 It is a schematic structural diagram of the cleaning rod in the present invention.

[0030] The reference numerals are: 1, moving die; 2, injection nozzle; 3, charging cylinder; 4, communication port; 5, end cover; 6, fixed cylinder; 7, injection port; 8, fixed plug; 9, spiral rolling groove; 10, cleaning rod; 11, gear part; 12, connecting arm; 13, abutting rod; 14, piston plate; 15, plunger; 16, spiral piece; 17, spring; 18, rack; 19, movable plug; 20, tapered section; 21, slit; 22, discharge port; 23, closing part; 24, ball; 25, annular flange; 26, tapered hole. Detailed implementation manner

[0031] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0032] As Figures 1-8 shown, in this embodiment, the following is disclosed: an injection and stamping mold, including the moving die 1 of the injection and stamping mold. An injection nozzle 2 is installed on the moving die 1. The outer wall of the moving die 1 is screwed with a charging cylinder 3. One end of the charging cylinder 3 away from the moving die 1 is open and screwed with an end cover 5. The periphery of the charging cylinder 3 is provided with an injection port 7. The injection port 7 is connected to an external molten material delivery pump. The molten material delivery pump transports the molten material from the injection port 7 into the charging cylinder 3. One end of the injection nozzle 2 is located inside the charging cylinder 3, and the other end passes through the charging cylinder 3 and is flush with the surface of the moving die 1;

[0033] A plunger 15 is coaxially inserted into the injection nozzle 2. The inside of the plunger 15 is hollow. In addition, the plunger 15 can telescopically fit inside the injection nozzle 2. One end of the plunger 15 facing the outside of the charging cylinder 3 is coaxially provided with a tapered section 20. The outer diameter of the tapered section 20 gradually decreases in the direction towards the outside of the charging cylinder 3. A tapered hole 26 for the tapered section 20 to engage is opened in the injection nozzle 2. The mouth of the tapered section 20 is provided with an inwardly turned closing part 23. A plurality of slits 21 penetrating the closing part 23 are opened on the periphery of the tapered section 20. A discharge port 22 is opened at one end of the plunger 15 away from the tapered section 20. The discharge port 22 communicates with the inside of the plunger 15. The plunger 15 and the tapered section 20 are integrally formed and made of spring steel material, so that the assembly of the plunger 15 and the tapered section 20 is more convenient. In addition, the plunger 15 and the tapered section 20 are made of spring steel material, so that the plunger 15 and the tapered section 20 have a large degree of elastic deformation. An air cylinder (not shown in the figure) is installed on the end cover 5. The air cylinder rod of the air cylinder penetrates the end cover 5 into the charging cylinder 3. In addition, a connecting arm 12 is fixedly sleeved at one end of the plunger 15 facing the end cover 5. The air cylinder rod of the air cylinder penetrates into the charging cylinder 3 and is fixedly connected to the connecting arm 12;

[0034] A cleaning rod 10 is coaxially and rotatably connected to the plunger 15. One end of the cleaning rod 10 that penetrates into the plunger 15 is fixedly connected with a spiral blade 16. A fixed cylinder 6 is vertically penetrated through the end cover 5. The cleaning rod 10 is coaxially telescopically inserted into the fixed cylinder 6. One end of the cleaning rod 10 that penetrates into the fixed cylinder 6 is rotatably fitted with a ball 24. A spiral rolling groove 9 for the ball 24 to engage is provided on the inner wall of the fixed cylinder 6, and the ball 24 freely rolls in the spiral rolling groove 9;

[0035] When the cylinder rod of the cylinder extends, it will drive the connecting arm 12 to move towards the injection nozzle 2, so that the connecting arm 12 drives the plunger 15 and the cleaning rod 10 to move towards the injection nozzle 2. On the one hand, the plunger 15 starts to insert into the injection nozzle 2. During the process of inserting into the injection nozzle 2, the molten material remaining in the injection nozzle 2 will enter the interior of the plunger 15 from the mouth of the tapered section 20 and the slit 21 until the lower end surface of the final closing part 23 is flush with the end surface of the injection nozzle 2. On the other hand, when the connecting arm 12 moves towards the injection nozzle 2, relative movement is generated between the cleaning rod 10 and the fixed cylinder 6. The ball 24 on the cleaning rod 10 will roll in the spiral rolling groove 9 of the fixed cylinder 6. Subject to the extrusion force of the inner wall of the spiral rolling groove 9, the cleaning rod 10 will rotate, and then the cleaning rod 10 drives the spiral blade 16 to rotate. When the spiral blade 16 rotates, it can quickly convey the molten material entering the plunger 15 to the discharge port 22, and then it is convenient to enter the injection cylinder 3 from the discharge port 22;

[0036] One end of the injection nozzle 2 that penetrates into the injection cylinder 3 is slidably sleeved with a piston plate 14. A buffer space is formed between the lower end surface of the piston plate 14 and the inner bottom wall of the injection cylinder 3. A spring 17 is installed in the buffer space. The spring 17 is wound around the injection nozzle 2. The two ends of the elastic force direction of the spring 17 elastically abut against the piston plate 14 and the inner bottom wall of the injection cylinder 3 respectively. A pressing rod 13 extending downward is fixedly connected to the lower surface of the connecting arm 12. The pressing rod 13 is used in cooperation with the piston plate 14. An annular flange 25 is coaxially fixedly connected to the upper end of the injection nozzle 2, and the annular flange 25 is used to limit the upward movement of the piston plate 14;

[0037] When the connecting arm 12 moves towards the injection nozzle 2, the pressing rod 13 will gradually approach the piston plate 14. After the end of the pressing rod 13 contacts the piston plate 14, as the connecting arm 12 continues to move towards the injection nozzle 2, the piston plate 14 starts to move towards the injection nozzle 2, and then the volume inside the injection cylinder 3 increases. In this way, the storage space of the molten material in the injection cylinder 3 increases, and then the molten material in the plunger 15 can smoothly drain into the injection cylinder 3, avoiding the phenomenon that the molten material in the injection cylinder 3 is too much and causes blockage interference to the mouth of the discharge port 22, thereby affecting the discharge of the molten material in the plunger 15 from the mouth of the discharge port 22;

[0038] A fixed plug 8 is fixedly installed inside the injection port 7. A plurality of communication ports 4 in the form of through holes are formed on the end face of the fixed plug 8. An active plug 19 is movably connected inside the injection port 7. The side projection area of the active plug 19 covers the communication ports 4. A rotating shaft is coaxially rotatably connected to the fixed plug 8. The rotating shaft is threadedly penetrated through the active plug 19. A clamping block is fixedly connected to the end face of the active plug 19. A sliding groove for the clamping block to engage is provided on the inner wall of the injection port 7. The clamping block freely slides in the sliding groove. One end of the rotating shaft penetrating into the charging cylinder 3 is provided with a gear portion 11. A rack 18 is fixedly connected to the connecting arm 12. When the rack 18 moves up and down, it will engage with the gear portion 11;

[0039] When the connecting arm 12 moves in the direction of the injection nozzle 2, the rack 18 will engage and drive with the gear portion 11, thereby driving the gear portion 11 to rotate. When the gear portion 11 rotates, it drives the rotating shaft to rotate. When the rotating shaft rotates, through the threaded engagement between the rotating shaft and the active plug 19, the active plug 19 will horizontally move inside the injection port 7, so that the end face of the active plug 19 abuts against the end face of the fixed plug 8. In this way, the active plug 19 closes the orifice of the communication port 4, so that the molten material in the conveying pipeline of the external molten material delivery pump cannot enter the charging cylinder 3 anymore.

[0040] The working principle of the present invention: When performing injection molding, after the moving mold 1 is clamped with the fixed mold of the injection molding machine, the external molten material delivery pump transports the molten material to the injection port 7, and then enters the charging cylinder 3 through the injection port 7. At this time, the plunger 15 is disengaged from the insertion state with the injection nozzle 2, so that the molten material in the charging cylinder 3 can enter the injection nozzle 2. The molten material will enter the mold cavities of the moving mold 1 and the fixed mold from the orifice of the tapered hole 26 of the injection nozzle 2;

[0041] After the molten material to be melted is transported in place, the cylinder is started, and the cylinder rod of the cylinder extends, driving the connecting arm 12 to move towards the injection nozzle 2, so that the connecting arm 12 drives the plunger 15 and the cleaning rod 10 to move towards the injection nozzle 2. On the one hand, the plunger 15 starts to insert into the injection nozzle 2. During the process of inserting into the injection nozzle 2, since the tapered section 20 of the plunger 15 is not caught in the tapered hole 26 in the initial stage, at this time, the tapered section 20 of the plunger 15 undergoes elastic expansion deformation, so that the lower opening of the tapered section 20 is open and the slit 21 is not closed. At this time, the molten material remaining in the injection nozzle 2 will enter the interior of the plunger 15 from the opening of the tapered section 20 and the slit 21 until the lower end face of the final closing part 23 is flush with the end face of the injection nozzle 2. On the other hand, when the connecting arm 12 moves towards the injection nozzle 2, relative movement is generated between the cleaning rod 10 and the fixed cylinder 6. The ball 24 on the cleaning rod 10 will roll in the spiral rolling groove 9 of the fixed cylinder 6. Subject to the extrusion force of the inner wall of the spiral rolling groove 9, the cleaning rod 10 will rotate, and then the cleaning rod 10 drives the spiral blade 16 to rotate. When the spiral blade 16 rotates, it can quickly transport the molten material entering the plunger 15 to the discharge port 22, and then it is convenient to enter the injection cylinder 3 from the discharge port 22. At this time, when the tapered section 20 is caught in the tapered hole 26, it is squeezed by the inner wall of the tapered hole 26, and the tapered section 20 will elastically contract, so that the slit 21 is closed, and the closing part 23 is also completely closed. Furthermore, the opening on the lower side of the tapered section 20 is completely closed, and the lower end face of the tapered section 20 is flush with the lower end face of the injection nozzle 2. The molten material in the mold cavity cannot enter the injection nozzle 2 from the lower side opening of the tapered section 20;

[0042] The abutting rod 13 will gradually approach the piston plate 14. After the end of the abutting rod 13 contacts the piston plate 14, as the connecting arm 12 continues to move towards the injection nozzle 2, the piston plate 14 starts to move towards the injection nozzle 2, so that the volume in the injection cylinder 3 increases, which increases the storage space of the molten material in the injection cylinder 3. Furthermore, the molten material in the plunger 15 can be smoothly discharged into the injection cylinder 3, avoiding the phenomenon that the molten material in the injection cylinder 3 is too much and causes blockage interference to the opening of the discharge port 22, thereby affecting the discharge of the molten material in the plunger 15 from the opening of the discharge port 22;

[0043] When the connecting arm 12 moves towards the injection nozzle 2, the rack 18 will be meshed and driven with the gear part 11, thereby driving the gear part 11 to rotate. When the gear part 11 rotates, it drives the rotating shaft to rotate. When the rotating shaft rotates, through the screw thread engagement between the rotating shaft and the movable plug 19, the movable plug 19 will move horizontally in the injection port 7, so that the end face of the movable plug 19 is in contact with the end face of the fixed plug 8. In this way, the movable plug 19 closes the opening of the communication port 4, so that the molten material in the conveying pipeline of the external molten material conveying pump cannot enter the injection cylinder 3 anymore.

[0044] The following points should be noted: First, in the description of this application, it should be noted that unless otherwise specified and defined, the terms "installed", "connected", and "coupled" should be understood in a broad sense, which can be mechanical connection or electrical connection, or the communication inside two components, and can be directly connected. The terms "upper", "lower", "left", "right", etc. are only used to represent the relative position relationship. When the absolute position of the object being described changes, the relative position relationship may change;

[0045] Second, in the drawings of the disclosed embodiments of the present invention, only the structures related to the disclosed embodiments are involved. For other structures, reference can be made to the general design. Without conflict, the same embodiment and different embodiments of the present invention can be combined with each other;

[0046] Finally, the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An injection molding die, comprising a movable die (1) of the injection molding die, wherein an injection nozzle (2) is mounted on the movable die (1), characterized in that: Also includes: An injection barrel (3) detachably connected to the outer wall of the movable mold (1), wherein one end of the injection barrel (3) away from the movable mold (1) is open and connected to an end cover (5), and an injection port (7) is provided on the periphery of the injection barrel (3); A plunger (15) is coaxially arranged in the injection nozzle (2), the interior of the plunger (15) is hollow and can slide freely in the injection nozzle (2), a conical section (20) is coaxially arranged at one end of the plunger (15) facing the outside of the injection barrel (3), the outer diameter of the conical section (20) decreases gradually in the direction of the outside of the injection barrel (3), a conical hole (26) for the conical section (20) to engage is provided in the injection nozzle (2), the mouth of the conical section (20) is provided with a closing section (23) made inwardly turned, the periphery of the conical section (20) is provided with a plurality of slits (21) penetrating the closing section (23), and a discharge port (22) is provided at one end of the plunger (15) away from the conical section (20), and the discharge port (22) is communicated with the interior of the plunger (15); The injection barrel (3) is provided with a driving unit for driving the plunger (15) to be inserted into the injection nozzle (2), the driving unit comprising a cylinder mounted on the end cover (5), one end of the plunger (15) facing the end cover (5) is fixedly sleeved with a connecting arm (12), and the cylinder rod of the cylinder penetrates into the injection barrel (3) and is fixedly connected to the connecting arm (12); A cleaning rod (10) is coaxially rotatably connected to the plunger (15), and one end of the cleaning rod (10) that penetrates into the plunger (15) is fixedly connected to a spiral sheet (16). A rotating unit for driving the cleaning rod (10) to rotate is provided on the injection barrel (3), and the rotating unit comprises a fixed barrel (6) vertically penetrated on the end cover (5). The cleaning rod (10) is coaxially telescopically inserted into the fixed barrel (6), and one end of the cleaning rod (10) that penetrates into the fixed barrel (6) is rotatably embedded with a ball (24). The inner wall of the fixed barrel (6) is provided with a spiral rolling groove (9) for the ball (24) to engage, and the ball (24) rolls freely in the spiral rolling groove (9); A fixed plug (8) is fixedly installed in the injection port (7), and a plurality of communication ports (4) in the form of through holes are opened on the end surface of the fixed plug (8). A movable plug (19) is movably connected in the injection port (7), and the side projection area of ​​the movable plug (19) covers the communication port (4). A sealing unit for driving the movable plug (19) to move relative to the fixed plug (8) is provided in the injection barrel (3); The sealed unit includes a rotating shaft coaxially connected to the fixed plug (8), the rotating shaft is threadedly inserted into the movable plug (19), a clamping block is fixedly connected to the end face of the movable plug (19), the inner wall of the injection port (7) is provided with a sliding groove for the clamping block to engage, and the clamping block slides freely in the sliding groove, and a gear part (11) is provided at one end of the rotating shaft that penetrates into the injection barrel (3), and a rack (18) is fixedly connected to the connecting arm (12), and the rack (18) will mesh with the gear part (11) when moving up and down.

2. The injection molding die according to claim 1, characterized in that: The plunger (15) and the cone section (20) are an integrally formed structure and are made of spring steel.

3. The injection molding die according to claim 1, characterized in that: One end of the injection nozzle (2) that penetrates into the injection barrel (3) is slidably connected to a piston plate (14), and a buffer space is formed between the lower end surface of the piston plate (14) and the inner bottom wall of the injection barrel (3). An elastic member is installed in the buffer space, and the elastic member elastically presses against the piston plate (14) upward. The lower surface of the connecting arm (12) is fixedly connected to a push rod (13) extending downward, and the push rod (13) is used in conjunction with the piston plate (14).

4. The injection molding die according to claim 3, characterized in that: The elastic member is a spring (17) wrapped around the injection nozzle (2), and the two ends of the spring (17) in the elastic force direction elastically press against the piston plate (14) and the inner bottom wall of the injection barrel (3) respectively.

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