A ring gasket in-mold cutting injection mold

Abstract

The present invention relates to the field of injection molding technology, and discloses an annular gasket in-mold cutting injection mold, comprising a detachable upper mold and a bottom mold, wherein a groove is provided on the top of the bottom mold, and a mold core is inserted in the upper mold; the mold core comprises a cylinder body which is fitted with the inner wall of the upper mold and has an open bottom, and the top of the cylinder body is connected to a driving mechanism through a connecting column; a movable column is elastically and slidably arranged in the cylinder body, and a material guide plate is fixedly and sealedly installed at the bottom of the movable column, and a heat-insulating truncated cone which is coaxial with the groove and is larger at the top and smaller at the bottom is fixedly installed at the bottom of the material guide plate. The present invention can realize punching of the formed sheet in the membrane, and after the excess waste is cut off, an annular gasket can be formed, and its inner wall is smooth and has no burrs; the operation of cutting off the burrs is realized in the mold by using the ingenious structural design of the mold core, and there is no need to adopt the removal method after leaving the mold, so as to avoid increasing the equipment investment to increase the cost and increasing the operation process to affect the work efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of injection molding, and in particular to an annular gasket in-mold cutting injection mold. Background Art

[0002] As a multifunctional industrial material, plastic gaskets have multiple functions such as heat insulation, corrosion resistance, insulation and flame retardancy, shock absorption and cushioning, and sealing, and are widely used in the fields of automobile manufacturing, electronic appliances, construction engineering, and chemical industry. Most of them are annular in shape. When making plastic annular gaskets, the existing technology is through injection molding.

[0003] For example, the Chinese invention patent with application number CN202111635361.X, publication (announcement) number CN114523621A, and name “A production mold for automobile shock-absorbing gaskets”, the injection molding material is passed into the inner cavity of the injection molding tube through a feed pipe, and the injection molding material enters the inner cavity of the injection molding groove through the injection hole. After the inner cavity of the injection molding groove is filled, it flows into the inner cavity of the molding groove through the connecting groove until the inner cavity of all the molding grooves is filled with the injection molding material. After cooling, the drive motor works to make multiple rotating blocks rotate synchronously and separate from the products through the meshing transmission between two adjacent transmission gears. Finally, the electric push rod at the upper end of the upper mold assembly is started and retracted to separate the upper mold assembly from the lower mold assembly. At this time, the product solidified in the inner cavity of the injection hole is pulled apart, and it is ensured that the product molded in the inner cavity of the injection molding groove is ring-shaped.

[0004] The applicant discovered in the actual manufacturing process that the injection molding of the annular gasket is formed by the molten plastic flowing in a way of embracing a cylinder, and the diameter of the cylinder is the inner diameter of the annular gasket. However, when the temperature in the mold is low or the exhaust is improper, burrs are easily generated between the inner wall of the annular gasket and the cylinder. When the annular gasket is sleeved on the column, the presence of burrs on the inner wall of the annular gasket will cause a series of problems such as poor sealing between the annular gasket and the column. For this reason, the solution in the prior art is to remove the annular gasket after the injection molding is completed, and remove the burrs on the inner wall of the annular gasket by special punching equipment or cutting equipment. This removal method will increase the investment in punching equipment, resulting in increased costs, and increase the operating procedures and reduce work efficiency. Therefore, how to achieve the goal of not generating burrs on the inner wall of the annular gasket after the injection molding is completed without adding special punching equipment or cutting equipment is a technical problem that needs to be solved urgently. Summary of the invention

[0005] The purpose of the present invention is to provide an annular gasket in-mold cutting injection mold to solve the above-mentioned shortcomings in the prior art.

[0006] In order to achieve the above object, the present invention provides the following technical solution: an annular gasket in-mold cutting injection mold, comprising a detachable upper mold and a bottom mold, the top of the bottom mold is provided with a groove, and a mold core is inserted in the upper mold;

[0007] The mold core comprises a cylinder body which is in contact with the inner wall of the upper mold and has an open bottom, and the top of the cylinder body is connected to a driving mechanism via a connecting column;

[0008] A movable column is elastically slidably arranged in the cylinder body, a material introduction plate is fixedly and sealedly installed at the bottom of the movable column, a heat-insulating truncated cone coaxial with the groove and in the shape of a truncated cone with a larger top and a smaller bottom is fixedly installed at the bottom of the material introduction plate, the heat-insulating truncated cone is inserted into the groove and is sealedly abutted against the top of the groove;

[0009] A ring cutter is fixedly installed at the bottom of the cylinder body, a receiving groove is provided at the top of the material introducing plate, a plurality of injection holes connected with the receiving groove are provided on the outer peripheral surface of the material introducing plate, a conveying channel connected with the receiving groove for the circulation of molten plastic is provided on the movable column, an injection tube is slidably inserted in the conveying channel, the molten plastic enters the conveying channel through the injection tube and then flows into between the upper mold and the bottom mold through the plurality of injection holes and embraces the insulating truncated cone to form a molding sheet, and after the molding sheet is cooled, the driving mechanism drives the cylinder body to move downward so that the ring cutter punches the molding sheet to form an annular gasket.

[0010] In the above-mentioned annular gasket in-mold cutting injection mold, the feed plate is located below the ring knife, and the ring knife abuts against the outer peripheral surface of the feed plate so that the ring knife moves down and passes through the feed plate during the punching process to scrape off the solidified plastic adhering to the injection hole port and the outer peripheral surface of the feed plate.

[0011] In the above-mentioned annular gasket in-mold cutting injection mold, the movable column is slidably and sealedly plugged into the cylinder body, and the injection tube is slidably and sealedly plugged into the conveying channel to form a sealed cavity between the movable column and the cylinder body. A plurality of circumferentially arranged air vents are provided in the cylinder body, one end of the air vent is connected to the sealed cavity, and the other end is connected to the bottom of the cylinder body and is fixedly connected to a rubber suction cup. A one-way exhaust valve connected to the sealed cavity is installed on the cylinder body. During the process of the annular knife punching the formed sheet, the rubber suction cup squeezes and adsorbs the formed sheet. After the punching is completed, the cylinder body drives the rubber suction cup adsorbed with the annular gasket to move upward to move the annular gasket out of the mold.

[0012] The above-mentioned annular gasket in-mold cutting injection mold, the molding sheet is punched to form an annular gasket and waste, based on the sliding sealing connection between the movable column and the cylinder body and the adsorption of the rubber suction cup and the annular gasket, when the cylinder body moves upward after the punching is completed, the movable column cannot elastically slide out of the cylinder body but moves upward synchronously with the cylinder body, thereby making the annular gasket, waste and the ring cutter inserted between the two synchronously follow the cylinder body to move upward so that the debris generated during the punching will not fall into the mold.

[0013] In the above-mentioned annular gasket in-mold cutting injection mold, a plurality of elastic telescopic parts arranged circumferentially are inserted on the insulating circular table. In the initial state, the elastic telescopic parts are located in the groove. When the cylinder body drives the insulating circular table to move up, the elastic telescopic parts pop out to support the waste material punched out, thereby preventing the waste material from falling and separating from the ring cutter during the upward movement.

[0014] The above-mentioned annular gasket in-mold cutting injection mold, the elastic telescopic part includes a slidably inserted support cap and a sliding plug, a return spring is fixedly connected between the support cap and the sliding plug, the sliding plug is slidably inserted with the insulating cone, and the inner wall of the cylinder body is fixedly installed with a plurality of fixed rods corresponding to the plurality of sliding plugs. Based on the insertion of the fixed rods and the sliding plugs, the sliding plugs are limited to specific positions. In the initial state, the circumscribed circles of the plurality of support caps fall within the inclined rod so that the plurality of elastic telescopic parts can be inserted into the groove without contacting the groove.

[0015] In the above-mentioned annular gasket in-mold cutting injection mold, the cylinder body drives multiple fixed rods to move downward, and the multiple fixed rods push the corresponding sliding plugs to slide outward so that the multiple support caps elastically abut against the inner wall of the groove. When the cylinder body moves upward, the relative position of the movable column and the cylinder body remains unchanged, so that the relative position between the fixed rod and the sliding plug remains unchanged, so that when the multiple support caps are moved out of the groove, they can elastically slide outward to the bottom of the waste to support the waste.

[0016] In the above-mentioned annular gasket in-mold cutting injection mold, after the annular gasket and waste material are moved out of the mold, the one-way exhaust valve is opened to allow external gas to enter the sealing cavity, so that the annular gasket is detached from the rubber suction cup and the movable column elastically slides out of the cylinder body. During the process of the movable column elastically sliding out of the cylinder body, the fixed rod pulls the sliding plug to slide inward to reset the support cap and stagger it with the waste material, thereby causing the waste material to detach from under the insulating truncated table.

[0017] In the above-mentioned annular gasket in-mold cutting injection mold, the fixed rod includes an integrally arranged vertical rod and an inclined rod, the inclined rod is located below the vertical rod, and the sliding plug is provided with a through hole for the inclined rod and the vertical rod to be inserted. Based on the inclined setting of the inclined rod, the inclined rod drives the sliding plug to move horizontally when it moves vertically.

[0018] In the above-mentioned annular gasket in-mold cutting injection mold, the fixing rod and the receiving groove are staggered so that the fixing rod does not contact the molten plastic. Beneficial Effects

[0019] 1. In the above technical scheme, the present invention provides an annular gasket in-mold cutting injection mold. When the molten plastic is injected, a molded sheet with an inner diameter smaller than the annular gasket is formed through an overflow process. Then, the molded sheet can be punched in the film by utilizing the structure of the mold core itself. After the excess waste is cut off, an annular gasket can be formed. At this time, the inner wall of the annular gasket is smooth and has no burrs. When it is taken out, it is an annular gasket after the burrs are removed. At the same time, the operation of removing the burrs is realized in the mold by utilizing the ingenious structural design of the mold core, and there is no need to adopt the removal method after leaving the mold, so as to avoid increasing the equipment investment to increase the cost and increasing the operation process to affect the work efficiency, which can effectively solve the shortcomings of the prior art.

[0020] 2. In the present invention, since the molten plastic flows out through multiple injection holes, the molten plastic can be injected into the molding cavity in multiple directions, thereby reducing the flow time of the molten plastic in the molding cavity to improve the speed and uniformity of molding of the molding sheet. However, during the outflow process, the molten plastic will adhere to the port of the injection hole and the outer peripheral surface of the feed plate. After the injection molding is completed, the plastic adhered to the port of the injection hole and the outer peripheral surface of the feed plate is easy to solidify and affect the stability of the flow of the molten plastic next time. In the present invention, the cylinder body is used to drive the ring knife to punch the molding sheet downward, so that the ring knife can cleverly scrape off the solidified plastic adhered to the port of the injection hole and the outer peripheral surface of the feed plate. It can be seen that the ring knife produces unexpected technical effects in the process of punching the molding sheet;

[0021] 3. Furthermore, the present invention further improves the mold core structure, utilizes the sliding seal plugging between the movable column and the cylinder body, and utilizes the arrangement of the vent hole and the rubber suction cup, so that after the punching is completed, the multiple rubber suction cups on the mold core can absorb the punched annular gasket and be pulled out of the mold cavity together with the mold core, thereby realizing the automatic material removal of the annular gasket;

[0022] 4. The present invention is more ingenious in that the rubber suction cup and the annular gasket are adsorbed to prevent gas from entering the sealed cavity, so that the relative position between the movable column and the cylinder body remains unchanged when the cylinder body moves upward, and the movable column will not pop out of the cylinder body, so that the waste material will also move upward synchronously with the annular gasket and the ring knife, so that the annular gasket, the waste material and the ring knife are moved out of the mold cavity in the state of punching and cutting, so that the debris is difficult to fall into the mold cavity. This invention can not only realize the automatic removal of the annular gasket and the waste material from the mold cavity, but also remove them synchronously as a whole. This method can make it difficult for the debris generated during punching to fall into the mold cavity, producing unexpected technical effects;

[0023] 5. Furthermore, the present invention can support the waste materials in the process of upward movement by adding elastic telescopic parts, so as to prevent the waste materials from being separated from the ring cutter during the upward movement, and at the same time, it will not hinder the separation of the waste materials from the insulating round table. These two functions are all achieved passively. When the waste materials need to be supported, the elastic telescopic parts automatically play a supporting role. When the waste materials need to be removed, the elastic telescopic parts can be automatically recovered without hindering the separation of the waste materials from the insulating round table, which perfectly solves this contradictory problem. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0025] Figure 1 A schematic structural diagram of an annular gasket in-mold cutting injection mold when the driving mechanism is removed provided by an embodiment of the present invention;

[0026] Figure 2 A schematic cross-sectional view of the annular gasket in-mold cutting injection mold when the driving mechanism is removed provided in an embodiment of the present invention;

[0027] Figure 3 A schematic diagram of the structure of a mold core provided by an embodiment of the present invention;

[0028] Figure 4 A schematic diagram of a cross-sectional structure between a mold core and a bottom mold in an initial state provided by an embodiment of the present invention;

[0029] Figure 5 The embodiment of the present invention provides Figure 4 A schematic diagram of the enlarged structure of part A;

[0030] Figure 6 A schematic cross-sectional view of the elastic telescopic member provided in an embodiment of the present invention;

[0031] Figure 7 A schematic cross-sectional view of a ring cutter punching a formed sheet provided in an embodiment of the present invention;

[0032] Figure 8 The embodiment of the present invention provides Figure 7 A schematic diagram of the enlarged structure of part B in FIG.

[0033] Fig. 9 A schematic cross-sectional view of the structure when the mold core is removed from the mold cavity provided by an embodiment of the present invention;

[0034] Fig.10 The embodiment of the present invention provides Fig. 9Schematic diagram of the enlarged structure of part C in.

[0035] Description of reference numerals:

[0036] 1. Cylinder body; 101. Sealing chamber; 102. Vent; 2. Movable column; 201. Conveying channel; 202. Avoidance groove; 3. Material guide plate; 301. Receiving groove; 302. Injection hole; 4. Insulating cone; 5. Fixed rod; 501. Inclined rod; 6. Sliding plug; 601. Through hole; 7. Support cap; 8. Reset spring; 9. Molding sheet; 10. Rubber suction cup; 11. Ring knife; 12. Compression spring; 13. Injection tube; 14. Connecting column; 15. Bottom mold; 1501. Groove; 16. Hose. DETAILED DESCRIPTION

[0037] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0038] like Figure 1-9 As shown, an embodiment of the present invention provides an annular gasket in-mold cutting injection mold, comprising a detachable upper mold and a bottom mold 15, a groove 1501 is provided on the top of the bottom mold 15, and a mold core is inserted in the upper mold;

[0039] The mold core includes a cylinder body 1 which is in contact with the inner wall of the upper mold and has an open bottom. The top of the cylinder body 1 is connected to a driving mechanism via a connecting column 14.

[0040] A movable column 2 is elastically slidably arranged in the cylinder body 1, a material introduction plate 3 is fixedly and sealedly installed at the bottom of the movable column 2, a heat-insulating truncated cone 4 which is coaxial with the groove 1501 and is truncated at the top and small at the bottom is fixedly installed at the bottom of the material introduction plate 3, the heat-insulating truncated cone 4 is inserted into the groove 1501 and is sealedly abutted against the top of the groove 1501;

[0041] A ring knife 11 is fixedly installed on the bottom of the cylinder body 1, a receiving groove 301 is provided on the top of the feed plate 3, and a plurality of injection holes 302 connected with the receiving groove 301 are provided on the outer peripheral surface of the feed plate 3. A conveying channel 201 connected with the receiving groove 301 for the circulation of molten plastic is provided on the movable column 2, and an injection tube 13 is slidably inserted in the conveying channel 201. After the molten plastic enters the conveying channel 201 through the injection tube 13, it flows into between the upper mold and the bottom mold 15 through the plurality of injection holes 302 and surrounds the insulating cone 4 to form a molding sheet 9. After the molding sheet 9 is cooled, the driving mechanism drives the cylinder body 1 to move downward so that the ring knife 11 punches the molding sheet 9 to form an annular gasket.

[0042] The ring gasket in-mold cutting injection mold provided in this embodiment is used for injection molding of the ring gasket. The words related to the direction and position involved in this embodiment are relative to the drawings. Specifically, a mold cavity is opened in the upper mold, and the mold core is slidably inserted in the mold cavity. The mold core moves up and down through a driving mechanism (not shown in the figure). The upper mold and the bottom mold 15 are sealed and detachably connected. The groove 1501 opened on the top of the bottom mold 15 is coaxial with the bottom mold 15. The groove 1501 is used for inserting the bottom of the mold core. The bottom mold 15 is coaxial with the groove 1501, and the outer peripheral surface of the cylinder body 1 is in contact with the inner wall of the mold cavity.

[0043] The movable column 2 is slidably inserted in the cylinder body 1, and a compression spring 12 is fixedly connected between the top of the movable column 2 and the top of the inner cavity of the cylinder body 1, and the elastic sliding of the movable column 2 is achieved based on the elastic force of the compression spring 12. The feed plate 3 is coaxial with the movable column 2 and has the same diameter. The top circle diameter of the heat-insulating truncated cone 4 is not larger than the diameter of the feed plate 3. The heat-insulating truncated cone 4 is inserted into the groove 1501 and is sealed against the top of the groove 1501 so that the groove 1501 limits the heat-insulating truncated cone 4 and thus limits the entire mold core. Based on the sealed contact between the heat-insulating truncated cone 4 and the top of the groove 1501, the top of the groove 1501 is blocked so that the molten plastic cannot flow into the groove 1501. The heat-insulating truncated cone 4 is supported by a heat-insulating material to facilitate the cooling and molding of the molding sheet 9. Among them, a molding cavity is formed between the upper mold, the bottom mold 15 and the insulating cone 4, and the molten plastic is molded into a molding sheet 9 in the molding cavity. After the molding sheet 9 is molded, the top height thereof is lower than the top height of the insulating cone 4, so that the inner diameter of the molding sheet 9 is smaller than the inner diameter of the annular gasket, so that the ring knife 11 can punch the molding sheet 9. The ring knife 11 is coaxial with the mold core. When the ring knife 11 completes punching the molding sheet 9, the molding sheet 9 is formed into two parts: an annular gasket and waste.

[0044] A receiving groove 301 is provided at the top of the feed plate 3, and a plurality of injection holes 302 connected with the receiving groove 301 are provided on the outer peripheral surface of the feed plate 3. A conveying channel 201 connected with the receiving groove 301 for the circulation of molten plastic is provided on the movable column 2. An injection molding tube 13 is slidably inserted in the conveying channel 201. The injection molding tube 13 is sealed and fixedly connected to the top of the movable column 2. The top of the injection molding tube 13 is located outside the movable column 2 and is connected to a hose 16. The hose 16 is connected to a feeding mechanism (not shown in the figure) for providing molten plastic. After the molten plastic enters the conveying channel 201 through the injection molding tube 13, it flows into between the upper mold and the bottom mold 15 through a plurality of injection holes 302 and surrounds the insulating frustum 4 to form a molding sheet 9. After the molding sheet 9 is cooled by a cooling mechanism (not shown in the figure), the driving mechanism drives the cylinder body 1 to move downward so that the ring knife 11 punches the molding sheet 9 to form an annular gasket. Its working principle is: first, the mold core is inserted into the upper mold cavity through the driving mechanism. During this process, the injection tube 13 moves downward synchronously with the cylinder body 1, and the hose 16 is gradually stretched and straightened, so that the insulating cone 4 is sealed and abutted against the top of the groove 1501 to block the groove 1501. Then the driving mechanism drives the cylinder body 1 to move downward to a specific height to make the movable column 2 squeeze the compression spring 12 to compress and deform. At this time, the ring knife 11 is located above the injection hole 302, and then the feeding mechanism injects molten plastic into the hose 16. The molten plastic flows into the conveying channel 201 through the injection tube 13 and then into the receiving groove 301. Then, it flows downward through multiple injection holes 302 between the upper mold and the bottom mold 15 and embraces the insulating cone 4 to form a molding sheet 9. After the molding sheet 9 is cooled, the driving mechanism drives the cylinder body 1 to move downward so that the ring knife 11 punches the molding sheet 9 to form an annular gasket.

[0045] It can be seen that the present invention forms a molding sheet 9 with an inner diameter smaller than that of the annular gasket through an overflow process when injecting molten plastic, and then utilizes the structure of the mold core itself to realize punching of the molding sheet 9 in the membrane, and the annular gasket can be formed after the excess waste is cut off. At this time, the inner wall of the annular gasket is smooth and has no burrs, and when it is taken out, it is the annular gasket after the burrs are removed; at the same time, the operation of removing the burrs is realized in the mold by utilizing the ingenious structural design of the mold core, and there is no need to adopt the removal method after leaving the mold, so as to avoid increasing equipment investment to increase costs and increasing operating procedures to affect work efficiency, which can effectively solve the shortcomings of the prior art.

[0046] Furthermore, the feed plate 3 is located below the annular knife 11, and the annular knife 11 abuts against the outer peripheral surface of the feed plate 3 so that the solidified plastic adhering to the port of the injection hole 302 and the outer peripheral surface of the feed plate 3 can be scraped off when the annular knife 11 moves downward to punch the molding sheet 9 through the feed plate 3. Specifically, since the molten plastic flows out through multiple injection holes 302, the molten plastic can be injected into the molding cavity in multiple directions, thereby reducing the flow time of the molten plastic in the molding cavity to improve the molding speed and uniformity of the molding sheet 9. However, during the outflow process, the molten plastic will adhere to the port of the injection hole 302 and the outer peripheral surface of the feed plate 3. After the injection molding is completed, the plastic adhering to the port of the injection hole 302 and the outer peripheral surface of the feed plate 3 is easy to solidify and mold, affecting the stability of the next molten plastic flow. In the present invention, the cylinder body 1 is used to drive the ring knife 11 to punch the forming sheet 9 downward, so that the ring knife 11 can skillfully scrape off the solidified plastic adhering to the injection hole 302 port and the outer peripheral surface of the feed plate 3. It can be seen that the ring knife 11 produces unexpected technical effects in the process of punching the forming sheet 9.

[0047] Furthermore, the movable column 2 is slidably and sealedly plugged into the cylinder body 1, and the injection tube 13 is slidably and sealedly plugged into the conveying channel 201, so that a sealed cavity 101 is formed between the movable column 2 and the cylinder body 1. A plurality of circumferentially arranged air holes 102 are provided in the cylinder body 1, one end of the air hole 102 is connected to the sealed cavity 101, and the other end is connected to the bottom of the cylinder body 1 and is fixedly connected to a rubber suction cup 10. A one-way exhaust valve (not shown in the figure) connected to the sealed cavity 101 is installed on the cylinder body 1. During the process of the ring knife 11 punching the forming sheet 9, the rubber suction cup 10 squeezes and absorbs the forming sheet 9. After the punching is completed, the cylinder body 1 drives the rubber suction cup 10 with the annular gasket absorbed thereon to move upward to move the annular gasket out of the mold. Specifically, the one-way exhaust valve can only discharge the gas in the sealed cavity 101 but cannot allow external gas to enter the sealed cavity 101. A plurality of rubber suction cups 10 are circumferentially installed at the bottom of the cylinder body 1. Based on the setting of the sealed cavity 101, the cylinder body 1 moves downward because the movable column 2 does not move downward during the process of the ring knife 11 moving downward to punch the forming sheet 9, so that the movable column 2 slides elastically into the cylinder body 1, so that the space of the sealed cavity 101 is reduced, the compression spring 12 is compressed, and the gas in the sealed cavity 101 flows out from the plurality of rubber suction cups 10 through the plurality of vent holes 102 and is discharged through the one-way exhaust valve. When the ring knife 11 contacts the forming sheet 9 and punches the forming sheet 9, the rubber suction cup 10 also contacts the forming sheet 9 and discharges the gas in the rubber suction cup 10, so that the rubber suction cup 10 is blocked by the forming sheet 9, and the movable column 2 generates a downward force under the action of the elastic force of the compression spring 12, and the external gas cannot enter the sealing cavity 101, so that negative pressure is generated in the multiple rubber suction cups 10 to absorb the punched out annular gaskets. When the driving mechanism drives the cylinder body 1 to move upward, the annular gaskets are driven upward by the multiple rubber suction cups 10 until the annular gaskets are moved out of the mold cavity.

[0048] It can be seen that the present invention, through further improvement of the core structure, utilizes the sliding sealing connection between the movable column 2 and the cylinder body 1 and utilizes the arrangement of the vent hole 102 and the rubber suction cup 10, so that after the punching is completed, the multiple rubber suction cups 10 on the core can absorb the punched annular gasket and be pulled out of the mold cavity together with the core, thereby realizing automatic material removal of the annular gasket.

[0049] Furthermore, after the forming sheet 9 is punched, an annular gasket and waste are formed. Based on the sliding sealing plug-in between the movable column 2 and the cylinder body 1 and the adsorption of the rubber suction cup 10 and the annular gasket, when the cylinder body 1 moves upward after the punching is completed, the movable column 2 cannot slide out elastically from the cylinder body 1 but moves upward synchronously with the cylinder body 1, so that the annular gasket, waste and the ring knife 11 inserted between the two synchronously follow the cylinder body 1 to move upward so that the debris generated during the punching will not fall into the mold. Specifically, since debris is generated when the forming sheet 9 is punched, and the debris exists between the annular gasket, waste, and the ring knife 11 and above the entire forming sheet 9, when the ring knife 11 is pulled out from between the annular gasket and the waste, the debris located between them will fall with it, and then when the annular gasket is adsorbed and moved upward by the rubber suction cup 10, the debris will fall into the mold cavity, and if the ring knife 11 is not pulled out from between the annular gasket and the waste, the debris will be difficult to fall into the mold cavity.

[0050] Therefore, the present invention is more ingenious in that the rubber suction cup 10 and the annular gasket are adsorbed to prevent gas from entering the sealed cavity 101, so that the relative position between the movable column 2 and the cylinder body 1 remains unchanged when the cylinder body 1 moves upward, and the movable column 2 does not pop out of the cylinder body 1, so that the waste material also moves upward synchronously with the annular gasket and the ring knife 11, so that the annular gasket, the waste material and the ring knife 11 are removed from the mold cavity in the state of punching completion (such as Fig. 9 and 10 As shown in the figure, it is difficult for debris to fall into the mold cavity. This invention can not only realize the automatic removal of the annular gasket and waste from the mold cavity, but also remove them in an overall synchronous manner. This method can make it difficult for the debris generated during punching to fall into the mold cavity, producing an unexpected technical effect.

[0051] Among them, a release agent is applied in the mold cavity to facilitate the demolding of the annular gasket and the waste material. Furthermore, when punching the forming sheet 9, the vibration force generated during the punching can loosen the forming sheet 9 and the mold cavity, thereby facilitating the better separation of the annular gasket and the waste material from the mold cavity, so that the annular gasket and the waste material can be smoothly removed.

[0052] Furthermore, due to the vibration force generated by punching, the waste material and the insulating cone 4 may become loose, so that when the waste material moves upward with the insulating cone 4, it is easy for the waste material to separate from the ring knife 11. For this reason, in the present embodiment, a plurality of circumferentially arranged elastic telescopic parts are inserted on the insulating cone 4. In the initial state, the elastic telescopic parts are located in the groove 1501. When the cylinder body 1 drives the insulating cone 4 to move upward, the elastic telescopic parts pop out to support the punched waste material, thereby preventing the waste material from falling and separating from the ring knife 11 during the upward movement.

[0053] Among them, the elastic telescopic part includes a slidably inserted support cap 7 and a sliding plug 6, a return spring 8 is fixedly connected between the support cap 7 and the sliding plug 6, the sliding plug 6 is slidably inserted with the insulating cone 4, and the inner wall of the cylinder body 1 is fixedly installed with multiple fixed rods 5 that are plugged in one by one with multiple sliding plugs 6. Based on the insertion of the fixed rods 5 and the sliding plugs 6, the sliding plugs 6 are limited to a specific position. In the initial state, the circumscribed circles of the multiple support caps 7 fall within the inclined rod 501 so that the multiple elastic telescopic parts can be inserted into the groove 1501 without contacting the groove 1501.

[0054] When the cylinder body 1 drives the multiple fixed rods 5 to move downward, the multiple fixed rods 5 push the corresponding sliding plugs 6 to slide outward so that the multiple support caps 7 elastically abut against the inner wall of the groove 1501. When the cylinder body 1 moves upward, the relative position of the movable column 2 and the cylinder body 1 remains unchanged, so that the relative position between the fixed rod 5 and the sliding plug 6 remains unchanged, so that when the multiple support caps 7 are moved out of the groove 1501, they can elastically slide outward to the bottom of the waste to support the waste.

[0055] After the annular gasket and waste material are removed from the mold, the one-way exhaust valve is opened to allow external gas to enter the sealed cavity 101, so that the annular gasket is detached from the rubber suction cup 10 and the movable column 2 elastically slides out of the cylinder body 1. During the process of the movable column 2 elastically sliding out of the cylinder body 1, the fixed rod 5 pulls the sliding plug 6 to slide inward to reset the support cap 7 to be offset from the waste material, thereby allowing the waste material to easily detach from under the insulating truncated table 4.

[0056] It can be seen that the present invention can support the waste material in the upward movement by adding an elastic telescopic part, prevent the waste material from separating from the ring knife 11 during the upward movement, and at the same time will not hinder the waste material from separating from the insulating circular table 4. These two functions are all achieved passively. When the waste material needs to be supported, the elastic telescopic part automatically plays a supporting role. When the waste material needs to be removed, the elastic telescopic part is automatically recovered without hindering the waste material from separating from the insulating circular table 4, which perfectly solves this contradictory problem.

[0057] The fixing rod 5 includes an integrally arranged vertical rod and an inclined rod 501, the inclined rod 501 is located below the vertical rod, and a through hole 601 is provided on the sliding plug 6 for the inclined rod 501 and the vertical rod to be inserted into. Based on the inclined setting of the inclined rod 501, the inclined rod 501 drives the sliding plug 6 to move horizontally when it moves vertically. The side surface of the through hole 601 close to the support cap 7 is an inclined surface with the same inclination as the inclined rod 501, and the surface of the through hole 601 corresponding to the inclined surface is a vertical surface.

[0058] In this embodiment, the fixing rod 5 is staggered with the receiving groove 301 so that the fixing rod 5 does not contact the molten plastic, and the movable column 2 is provided with an avoidance groove 202 corresponding to the fixing rod 5 for avoiding the vertical rod on the fixing rod 5 .

[0059] The above description is only by way of illustration of certain exemplary embodiments of the present invention. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. An annular gasket in-mold injection mold, comprising a detachable upper mold and a bottom mold (15), characterized in that: The top of the bottom mold (15) is provided with a groove (1501), and a mold core is inserted into the upper mold; The mold core comprises a cylinder body (1) which is in contact with the inner wall of the upper mold and has an open bottom, and the top of the cylinder body (1) is connected to a driving mechanism via a connecting column (14); A movable column (2) is elastically and slidably arranged in the cylinder body (1); a material introduction plate (3) is fixedly and sealedly installed at the bottom of the movable column (2); a heat-insulating truncated cone (4) coaxial with the groove (1501) and in the shape of a truncated cone with a larger top and a smaller bottom is fixedly installed at the bottom of the material introduction plate (3); the heat-insulating truncated cone (4) is inserted into the groove (1501) and is in sealing contact with the top opening of the groove (1501); A ring cutter (11) is fixedly mounted on the bottom of the cylinder body (1), a receiving groove (301) is provided on the top of the material guide plate (3), a plurality of injection holes (302) connected to the receiving groove (301) are provided on the outer peripheral surface of the material guide plate (3), a conveying channel (201) connected to the receiving groove (301) for the circulation of molten plastic is provided on the movable column (2), an injection tube (13) is slidably inserted in the conveying channel (201), the molten plastic enters the conveying channel (201) through the injection tube (13), and then flows into between the upper mold and the bottom mold (15) through the plurality of injection holes (302) and surrounds the heat-insulating truncated cone (4) to form a molding sheet (9), and after the molding sheet (9) is cooled, the driving mechanism drives the cylinder body (1) to move downward so that the ring cutter (11) punches the molding sheet (9) to form an annular gasket; The movable column (2) is slidably sealed and plugged into the cylinder body (1); the injection tube (13) is slidably sealed and plugged into the conveying channel (201) so that a sealed cavity (101) is formed between the movable column (2) and the cylinder body (1); a plurality of circumferentially arranged air holes (102) are provided in the cylinder body (1); one end of the air hole (102) is connected to the sealed cavity (101); the other end is connected to the bottom of the cylinder body (1) and is fixedly connected to a rubber suction cup (10); a one-way exhaust valve connected to the sealed cavity (101) is installed on the cylinder body (1); during the process of punching the forming sheet (9) by the annular knife (11), the rubber suction cup (10) squeezes and absorbs the forming sheet (9); after the punching is completed, the cylinder body (1) drives the rubber suction cup (10) with the annular gasket absorbed thereon to move upward so that the annular gasket is removed from the mold; A plurality of elastic telescopic parts arranged circumferentially are inserted into the heat insulating truncated table (4). In an initial state, the elastic telescopic parts are located in the grooves (1501). When the cylinder body (1) drives the heat insulating truncated table (4) to move upward, the elastic telescopic parts pop out to support the waste material punched out, thereby preventing the waste material from falling and separating from the ring knife (11) during the upward movement.

2. The annular gasket in-mold cutting injection mold according to claim 1, characterized in that: The material guide plate (3) is located below the circular knife (11), and the circular knife (11) abuts against the outer peripheral surface of the material guide plate (3) so that the circular knife (11) passes through the material guide plate (3) during the process of moving downward to punch and cut the formed sheet (9), so as to scrape off the solidified plastic adhering to the port of the injection hole (302) and the outer peripheral surface of the material guide plate (3).

3. The annular gasket in-mold cutting injection mold according to claim 1, characterized in that: After the forming sheet (9) is punched, an annular gasket and waste material are formed. Due to the sliding sealing connection between the movable column (2) and the cylinder body (1) and the adsorption between the rubber suction cup (10) and the annular gasket, when the cylinder body (1) moves upward after the punching is completed, the movable column (2) cannot elastically slide out of the cylinder body (1) but moves upward synchronously with the cylinder body (1), thereby causing the annular gasket, waste material and the ring knife (11) inserted between the two to move upward synchronously with the cylinder body (1) so that the debris generated during the punching will not fall into the mold.

4. The annular gasket in-mold cutting injection mold according to claim 1, characterized in that: The elastic telescopic member comprises a slidably plugged support cap (7) and a sliding plug (6), a return spring (8) being fixedly connected between the support cap (7) and the sliding plug (6), the sliding plug (6) being slidably plugged with the heat-insulating truncated cone (4), a plurality of fixed rods (5) plugged in one-to-one with the plurality of sliding plugs (6) being fixedly mounted on the inner wall of the cylinder body (1), the sliding plug (6) being limited at a specific position based on the plugging of the fixed rods (5) with the sliding plug (6), and the circumscribed circles of the plurality of support caps (7) falling within the inclined rod (501) in an initial state so that the plurality of elastic telescopic members can be inserted into the groove (1501) without contacting the groove (1501).

5. The annular gasket in-mold cutting injection mold according to claim 4, characterized in that: In the process of the cylinder body (1) driving the plurality of fixed rods (5) to move downward, the plurality of fixed rods (5) push the corresponding sliding plugs (6) to slide outward so that the plurality of support caps (7) elastically abut against the inner wall of the groove (1501); when the cylinder body (1) moves upward, the relative position of the movable column (2) and the cylinder body (1) remains unchanged, so that the relative position between the fixed rods (5) and the sliding plugs (6) remains unchanged, so that when the plurality of support caps (7) are removed from the groove (1501), they can elastically slide outward to the bottom of the waste material to support the waste material.

6. The annular gasket in-mold cutting injection mold according to claim 5, characterized in that: After the annular gasket and the waste material are removed from the mold, the one-way exhaust valve is opened to allow external gas to enter the sealed cavity (101), so that the annular gasket is detached from the rubber suction cup (10) and the movable column (2) elastically slides out of the cylinder body (1). During the process of the movable column (2) elastically sliding out of the cylinder body (1), the fixed rod (5) pulls the sliding plug (6) to slide inwardly so that the support cap (7) is reset and offset from the waste material, thereby causing the waste material to detach from below the heat-insulating truncated table (4).

7. The annular gasket in-mold cutting injection mold according to claim 4, characterized in that: The fixed rod (5) comprises a vertical rod and an inclined rod (501) which are integrally arranged, the inclined rod (501) being located below the vertical rod, and the sliding plug (6) is provided with a through hole (601) into which the inclined rod (501) and the vertical rod can be inserted, and due to the inclined arrangement of the inclined rod (501), when the inclined rod (501) moves vertically, it drives the sliding plug (6) to move horizontally.

8. The annular gasket in-mold cutting injection mold according to claim 4, characterized in that: The fixing rod (5) and the containing groove (301) are staggered so that the fixing rod (5) does not contact the molten plastic.

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