A secondary ejection assembly for an injection mold and an injection mold assembly having the same

Abstract

This invention relates to the field of injection molds, specifically to a secondary ejection assembly for injection molds and an injection mold assembly having the secondary ejection assembly, comprising an ejector plate mechanism and a limiting mechanism; the ejector plate mechanism includes an upper ejector plate and a lower ejector plate, with a limiting mechanism provided between the upper and lower ejector plates; the limiting mechanism includes a retaining base connected to the lower ejector plate; the retaining base is connected to the upper ejector plate via a guide seat; the upper ejector plate can drive the lower ejector plate to move synchronously via the limiting mechanism; the guide seat can disengage from the retaining base; this invention, through the design of the secondary ejection assembly, enables secondary ejection of the injection molded part from the injection mold, improving the problems of insufficient secondary ejection space, poor mold fitting accuracy, and easy jamming in traditional injection molds, while also having stronger adaptability to product design; and improving the reliability of mold production and the accuracy of finished products.

Description

Technical Field

[0001] This invention relates to the field of injection molds, specifically to a secondary ejection assembly for injection molds and an injection mold assembly having the secondary ejection assembly. Background Technology

[0002] Currently, injection molds are widely used in modern manufacturing to produce various plastic products.

[0003] Traditional injection molds typically use a one-time ejection method, meaning that after injection molding is completed, the ejector pin of the injection molding machine pushes the ejector plate to eject the product out of the mold.

[0004] However, as product complexity increases, the single ejection method cannot meet production needs in some cases, especially when dealing with products with complex structures such as deep ribs and bosses, which can easily lead to problems such as demolding difficulties, product damage, or surface defects.

[0005] To solve these problems, most injection molds use an internal ejector plate to allow for secondary ejection, or use a hydraulic cylinder to drive the secondary ejection.

[0006] However, regardless of the method used, there are high requirements for the ejection height of the product and the design of the mold. At the same time, the mold also faces the problem of poor precision and easy jamming during ejection.

[0007] Therefore, the existing technology has the following problems:

[0008] High space requirements: Traditional secondary ejection structures usually require a large mold space to accommodate additional mechanical parts, which not only increases the size and cost of the mold, but also limits the design flexibility of the mold.

[0009] High precision requirements: The secondary ejection structure requires extremely high precision in mold fitting; otherwise, problems such as ejection jamming and component wear may occur, affecting production efficiency and product quality.

[0010] Poor product adaptability: Existing secondary ejection designs have high requirements for product shape and are not suitable for all products that require secondary ejection, especially those with thin-walled structures or complex internal features.

[0011] Insufficient reliability: In actual production, the existing secondary ejection structure is prone to ejection failure due to problems such as component wear and loose fit, which affects the stability and reliability of production.

[0012] While the existing patent 201320033225.8 - "High-precision automated mold secondary ejection structure" can realize the secondary ejection operation of the product, it does not specifically disclose the technical content that solves the above-mentioned technical problem.

[0013] Therefore, in order to improve or solve at least one of the above technical problems, it is necessary to optimize the design of existing injection molds. Summary of the Invention

[0014] The purpose of this invention is to provide an ejection assembly that is applicable to injection molds and can realize secondary ejection of products in injection molds.

[0015] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0016] A secondary ejection assembly for injection molds includes an ejector plate mechanism and a limiting mechanism;

[0017] The top plate mechanism includes an upper top plate and a lower top plate, and a limiting mechanism is provided between the upper top plate and the lower top plate;

[0018] The limiting mechanism includes a buckle base connected to the lower top plate; the buckle base is connected to the upper top plate via a guide seat;

[0019] The upper top plate can drive the lower top plate to move synchronously through a limiting mechanism;

[0020] The guide seat can be detached from the fastener base.

[0021] The guide seat is connected to the upper top plate via a connecting unit. The connecting unit includes a mounting slot on the upper top plate, and the guide seat is arranged in the mounting slot. The guide seat is movable within the mounting slot. The guide seat connects to or disconnects from the fastener base by moving within the mounting slot.

[0022] The secondary ejection assembly also includes an adjustment unit, which includes a shovel mounted on the mold core; the shovel is capable of pushing the guide seat to move on the upper top plate.

[0023] The guide seat is connected to the upper top plate via an elastic unit;

[0024] The elastic unit includes a return spring, one end of which is connected to the upper top plate and the other end of which is connected to the guide seat.

[0025] A guide unit is provided between the shovel and the guide seat. The guide unit includes a push inclined surface disposed on the guide seat. The shovel is provided with a drive inclined surface. The drive inclined surface on the shovel can press against the push inclined surface of the guide seat.

[0026] The guide seat includes a guide seat body, which has a slot for inserting a shovel; the inner wall of the slot has a pushing slope.

[0027] The shovel includes a transverse block and a longitudinal block, the longitudinal block being connected to the mold core via the transverse block; the longitudinal block can be inserted into the insertion slot of the guide seat.

[0028] The guide seat also includes a limiting unit;

[0029] The limiting unit includes an end limiting unit and a top surface limiting unit;

[0030] The end limiting unit includes an end limiting block, which is connected to the end of the upper top plate by fasteners; the end limiting block can contact the end face of the guide seat; the top surface limiting unit includes a top surface limiting block, which is connected to the upper top plate, and a moving gap is provided between the top surface limiting block and the bottom surface of the mounting groove.

[0031] The guide seat is inserted into the moving gap via a sliding block.

[0032] The fastening base includes a fastening base body, which includes an upper connecting block, a longitudinal connecting block, and a lower connecting block. One end of the upper connecting block and the lower connecting block are connected by the longitudinal connecting block. The upper connecting block, the longitudinal connecting block, and the lower connecting block form a lateral opening.

[0033] The guide seat can be inserted into the lateral opening;

[0034] The fastener base is connected to the lower top plate via a plug-in positioning part; the plug-in positioning part includes a plug-in positioning groove provided at the end of the lower top plate; the fastener base is plugged into the plug-in positioning groove via a lower connecting block.

[0035] An injection mold assembly includes a lower mold base and a mold core; a secondary ejection assembly for the injection mold is provided between the lower mold base and the mold core.

[0036] The advantages of this invention are:

[0037] This invention discloses a secondary ejection assembly for injection molds and an injection mold assembly having the secondary ejection assembly.

[0038] This invention, through the design of a secondary ejection assembly, enables secondary ejection of the injection molded part from the injection mold, improving upon the problems of insufficient secondary ejection space, poor mold fitting accuracy, and easy production jamming in traditional injection molds. At the same time, it has greater adaptability to product design and improves the reliability of mold production and the precision of finished products. Attached Figure Description

[0039] The following is a brief explanation of the contents of each of the accompanying drawings and the markings in the drawings:

[0040] Figure 1 This is a schematic diagram of the structure of the present invention when connected to the mold core.

[0041] Figure 2 This is a schematic diagram of the structure of the shovel and the limiting mechanism used in this invention.

[0042] Figure 3 This is a front view of the shovel and the limiting mechanism used in this invention.

[0043] Figure 4 This is a right view of the shovel and the limiting mechanism used in this invention.

[0044] Figure 5 This is a schematic diagram of the arrangement of the top plate mechanism in the injection mold assembly in this invention.

[0045] Figure 6 This is a cross-sectional view of the arrangement of the top plate mechanism in the injection mold assembly in this invention.

[0046] The markings in the above figures are all:

[0047] 1. Lower top plate, 2. Upper top plate, 3. Mold core, 4. Limiting mechanism, 5. Shovel, 6. Ejector rod, 7. Lower mold base. Detailed Implementation

[0048] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings and the description of the preferred embodiments.

[0049] A secondary ejection assembly for injection molds includes an ejector plate mechanism and a limiting mechanism 4. The ejector plate mechanism includes an upper ejector plate 2 and a lower ejector plate 1, with the limiting mechanism 4 positioned between the upper ejector plate 2 and the lower ejector plate 1. The limiting mechanism 4 includes a retaining base 42 connected to the lower ejector plate 1. The retaining base 42 is connected to the upper ejector plate 2 via a guide seat 41. The upper ejector plate 2 can drive the lower ejector plate 1 to move synchronously via the limiting mechanism 4. The guide seat 41 can disengage from the retaining base 42. This invention, through the design of the secondary ejection assembly, enables secondary ejection of injection molded parts from the injection mold, improving the problems of insufficient secondary ejection space, poor mold fitting accuracy, and easy jamming in traditional injection molds. It also offers greater adaptability to product design and improves the reliability of mold production and the precision of finished products.

[0050] The secondary ejection assembly disclosed in this invention is mainly applicable to injection molds.

[0051] In this invention, the top plate mechanism mainly includes an upper top plate 2 and a lower top plate 1.

[0052] The upper top plate 2 and the lower top plate 1 are the core components of the secondary ejection assembly. They are connected by the limiting mechanism 4 to achieve synchronous or separate movement.

[0053] During one ejection stage, the upper top plate 2 and the lower top plate 1 are connected by the limiting mechanism 4 and move upward synchronously to achieve one ejection.

[0054] During the secondary ejection stage, the guide seat 41 disengages from the buckle seat 42, and the upper top plate 2 and the lower top plate 1 separate, thus achieving secondary ejection.

[0055] In this invention, the limiting mechanism 4 mainly includes a buckle base 42 and a guide base 41.

[0056] The mounting base 42 is fixed on the lower top plate 1.

[0057] The guide seat 41 is connected to the upper top plate 2 and indirectly connected to the lower top plate 1 through the fastener seat 42.

[0058] The guide seat 41 and the buckle seat 42 can be connected or disconnected, which is the key to achieving secondary ejection.

[0059] When the guide seat 41 is connected to the buckle seat 42, the upper top plate 2 drives the lower top plate 1 to run synchronously through the limiting mechanism 4.

[0060] When the guide seat 41 disengages from the buckle seat 42, the upper top plate 2 and the lower top plate 1 separate, achieving secondary ejection.

[0061] Initial state:

[0062] The guide seat 41 is connected to the buckle seat 42, and the upper top plate 2 and the lower top plate 1 are in a connected state, ready to perform the ejection action.

[0063] In actual use, the injection molding machine ejector rod 6 acts on the upper ejector plate 2.

[0064] One push

[0065] After injection molding is completed, the ejector rod 6 of the injection molding machine pushes the upper ejector plate 2 upward.

[0066] The upper top plate 2 drives the lower top plate 1 to move upward synchronously through the limiting mechanism 4 (the connection between the guide seat 41 and the buckle seat 42).

[0067] Secondary ejection;

[0068] During the ejection process, the excavator 5 will push the guide seat 41 to disengage it from the buckle seat 42.

[0069] Once the guide seat 41 disengages from the buckle seat 42, the connection between the upper top plate 2 and the lower top plate 1 is severed, the upper top plate 2 continues to move upward, while the lower top plate 1 stops moving.

[0070] This separation motion enables secondary ejection, which better meets the demolding requirements of complex products.

[0071] Meanwhile, in this invention, the number of limiting mechanisms 4 can be selected as needed, and generally two are set, respectively distributed at both ends of the top plate mechanism.

[0072] Furthermore, in this invention, the guide seat 41 is connected to the upper top plate 2 via a connecting unit. The connection unit facilitates the connection between the guide seat 41 and the upper top plate 2.

[0073] Furthermore, the connecting unit described in this invention includes a mounting groove 21 disposed on the upper top plate 2, and the guide seat 41 is arranged in the mounting groove 21; the guide seat 41 is movable within the mounting groove 21; the guide seat 41 connects or disconnects from the buckle base 42 by moving within the mounting groove 21; the mounting groove 21 is essentially a recessed groove structure set on the upper top plate 2, mainly used for the placement and arrangement of the guide seat 41 on the upper top plate 2; at the same time, in order to achieve the interconnection between the upper top plate 2 and the lower top plate 1, and to facilitate the subsequent separation between the upper top plate 2 and the lower top plate 1, this invention requires that the guide seat 41 be able to slide within the mounting groove 21.

[0074] The type and structure of the mounting slot 21 can be selected as needed. In this invention, the guide seat 41 can protrude from the mounting slot 21 or retract into the mounting slot 21 to achieve separation of the guide seat 41 from the buckle base 42.

[0075] In this invention, the design of the connecting unit enables the guide seat 41 to be stably installed on the upper top plate 2. The guide seat 41 can move within the mounting slot 21, thereby achieving connection or disconnection with the buckle base 42.

[0076] The placement groove 21 is a recessed structure set at the end of the upper top plate 2, used to place and arrange the guide seat 41.

[0077] The guide seat 41 is arranged in the mounting groove 21 and can slide within the mounting groove 21.

[0078] The mounting slot 21 provides a fixed position for the guide seat 41, ensuring the stable installation of the guide seat 41 on the upper top plate 2.

[0079] The design of the mounting slot 21 allows the guide seat 41 to slide inside it, thereby enabling the guide seat 41 to be connected to or disconnected from the buckle seat 42.

[0080] The placement groove 21 is essentially a sinking structure located on the upper top plate 2; the specific size is selected according to the needs, and generally the depth of the placement groove 21 is less than the thickness of the upper top plate 2.

[0081] The internal structure of the mounting slot 21 allows the guide seat 41 to slide inside it, thereby enabling the guide seat 41 to move.

[0082] The range of movement of guide seat 41:

[0083] Protruding mounting slot 21: The guide seat 41 can protrude from the mounting slot 21 and connect with the fastener base 42.

[0084] Retractable mounting slot 21: The guide seat 41 can retract into the mounting slot 21 and disengage from the buckle base 42.

[0085] The movable function of the guide seat 41 is the key to realizing the connection and separation of the upper top plate 2 and the lower top plate 1.

[0086] The movement of the guide seat 41 allows for switching between primary and secondary ejection; this design enables the secondary ejection assembly to adapt to different injection molded products and mold designs, improving the system's flexibility and versatility.

[0087] The type and structure of the mounting slot 21 can be selected according to specific product requirements and mold design; different mold designs may require mounting slots 21 of different shapes and sizes to meet specific ejection requirements.

[0088] Through the design of the connecting unit, especially the sinking structure of the mounting slot 21, the guide seat 41 can be stably installed on the upper top plate 2 and can slide within the mounting slot 21.

[0089] This design not only enables the connection and disconnection of the guide seat 41 and the buckle seat 42, but also improves the flexibility and adaptability of the secondary ejection assembly.

[0090] The protruding and retracting functions of the guide seat 41 make the connection and separation between the upper top plate 2 and the lower top plate 1 smoother, thereby realizing the switching between single ejection and double ejection.

[0091] Furthermore, the secondary ejection assembly in this invention also includes an adjustment unit, which includes a shovel 5 disposed on the mold core 3; the shovel 5 can push the guide seat 41 to move on the upper top plate 2; the adjustment unit of this invention is mainly used so that during the mold opening process, the shovel 5 is inserted into the guide seat 41, and the position of the guide seat 41 is changed by the mutual squeezing between the shovel 5 and the guide seat 41, that is, the movement of the guide seat 41 is realized, and the separation operation of the guide seat 41 and the fastener seat 42 is realized.

[0092] In this invention, the shovel 5 is the core component of the adjustment unit and is installed on the mold core 3.

[0093] The main function of the loader 5 is to push the guide seat 41 to move within the mounting slot 21 of the upper top plate 2; by pushing the guide seat 41, the loader 5 can control the connection or separation between the guide seat 41 and the buckle base 42, thereby realizing the connection or separation between the upper top plate 2 and the lower top plate 1.

[0094] The guide seat 41 is provided with a pushing inclined surface 421, which is used to cooperate with the driving inclined surface 53 of the shovel 5.

[0095] The shovel 5 is equipped with a drive ramp 53, which pushes the guide seat 41 to move through the compression between the ramps.

[0096] The design of the push ramp 421 and drive ramp 53 can convert the thrust of the shovel 5 into the lateral movement of the guide seat 41, thereby improving the smoothness and reliability of the movement.

[0097] The compression between the pushing inclined surface 421 and the driving inclined surface 53 ensures that the guide seat 41 slides smoothly within the mounting groove 21.

[0098] The shovel 5 is connected to the mold core 3. Initially, it does not contact the guide seat 41. When the ejector rod 6 of the injection molding machine lifts the upper plate 2, the upper plate mechanism moves upward. After it moves to the set position, the upper plate 2 in the upper plate mechanism contacts the shovel 5. The shovel 5 pushes the guide seat 41, thereby changing the position of the guide seat 41.

[0099] Furthermore, in this invention, the guide seat 41 is connected to the upper top plate 2 via an elastic unit; the elastic unit is mainly used for the guide seat 41 to return to its original position after use. After the shovel 5 disengages from the guide seat 41, the elastic unit enables the guide seat 41 to return to its original position quickly.

[0100] Specifically, the elastic unit in this invention includes a return spring 46. One end of the return spring 46 is connected to the upper top plate 2, and the other end is connected to the guide seat 41. One end of the return spring 46 is connected to the inner wall of the mounting groove 21, and the other end is connected to the guide seat 41. The return spring 46 mainly plays a pressing role to facilitate the quick return of the guide seat 41 and facilitate subsequent secondary ejection.

[0101] In this invention, the reset spring 46 is the core component of the elastic unit and is used to realize the reset function of the guide seat 41.

[0102] The main function of the return spring 46 is to push the guide seat 41 to the initial position so that it can be reconnected to the latch seat 42 during the next ejection process.

[0103] During the movement of the guide seat 41, the return spring 46 can act as a buffer to reduce impact and protect the structure of the guide seat 41 and the fastener seat 42.

[0104] To ensure the stability of the guide seat 41's operating position, the guide seat 41 is generally connected to the inner wall of the mounting slot 21 by two spaced parallel elastic units.

[0105] Furthermore, in this invention, a guide unit is provided between the shovel 5 and the guide seat 41. The guide unit includes a pushing inclined surface 421 disposed on the guide seat 41; the shovel 5 is provided with a driving inclined surface 53; the driving inclined surface 53 on the shovel 5 can press against the pushing inclined surface 421 of the guide seat 41; the provision of the guide unit facilitates the pushing operation of the shovel 5 on the guide seat 41.

[0106] The pushing inclined surface 421 is set on the guide seat 41 and is used to cooperate with the driving inclined surface 53 of the shovel 5. The driving inclined surface 53 is set on the shovel 5 and is used to push the guide seat 41 to move. Through the cooperation between the driving inclined surface 53 on the shovel 5 and the pushing inclined surface 421 on the guide seat 41, the shovel 5 pushes the guide seat 41.

[0107] The shovel 5 is converted into the lateral movement of the guide seat 41 in the mounting slot 21 by the drive inclined plane 53, thereby realizing the connection or disconnection of the guide seat 41 and the buckle seat 42.

[0108] In this invention, the angle design of the pushing inclined plane 421 and the driving inclined plane 53 is as follows: the angle of the inclined plane needs to be optimized according to actual needs to ensure that the thrust can be effectively converted into vertical motion.

[0109] Generally, the angles of the pushing inclined plane 421 and the driving inclined plane 53 are required to be 20-45 degrees with the horizontal plane or the upper top plate 2.

[0110] The materials and surface treatments for the pushing ramp 421 and the driving ramp 53 need to take into account the coefficient of friction in order to reduce energy loss and wear.

[0111] The push inclined plane 421 and the drive inclined plane 53 require high-precision machining to ensure that they fit together tightly and avoid jamming or poor sliding.

[0112] The push ramp 421 and drive ramp 53 need to be treated with wear-resistant materials (such as hard chrome plating, spraying wear-resistant coating, etc.) to extend their service life.

[0113] By designing the inclined plane 421 and the driving inclined plane 53, the shovel 5 can squeeze the guide seat 41 during mold opening, thereby enabling the upper top plate 2 and the lower top plate 1 to work together.

[0114] Furthermore, in this invention, the guide seat 41 includes a guide seat body, on which a insertion groove 42 for inserting the shovel 5 is provided; the inner wall of the insertion groove 42 is provided with a pushing inclined surface 421; in this invention, the setting of the insertion groove 42 makes the guide seat body form a ring structure. In actual design, the horizontal projection size of the minimum opening of the insertion groove 42 is required to be no less than the horizontal projection size of the shovel 5. This setting facilitates the subsequent arrangement design of the pushing inclined surface 421.

[0115] The pushing inclined surface 421 is provided on one inner wall surface of the insertion slot 42; generally, it is required that the pushing inclined surface 421 be provided on the side of the insertion slot 42 away from the buckle base 42.

[0116] Furthermore, in this invention, the shovel 5 includes a transverse block 52 and a longitudinal block 51. The longitudinal block 51 is connected to the mold core 3 through the transverse block 52. The longitudinal block 51 can be inserted into the insertion slot 42 of the guide seat 41. Based on this design, the shovel 5 forms an inverted L-shaped structure. When in use, the longitudinal block 51 can cooperate with the insertion slot 42 to realize the movement within the placement slot 21 of the guide seat 41. The transverse block 52 plays a good limiting role, which is beneficial to controlling the upward movement position of the upper top plate 2.

[0117] In this invention, the transverse block 52 is connected to the mold core 3, which serves to fix and limit the position.

[0118] The longitudinal block 51 is connected to the mold core 3 via the transverse block 52 and can be inserted into the insertion slot 42 of the guide seat 41.

[0119] The loader 5 forms an inverted L-shaped structure.

[0120] The longitudinal block 51 can be inserted into the insertion slot 42 of the guide seat 41 and contact the pushing inclined surface 421 in the insertion slot 42.

[0121] By cooperating with the pushing inclined surface 421, the longitudinal block 51 can push the guide seat 41 to move within the placement slot 21.

[0122] The horizontal block 52 acts as a limiter, controlling the upward movement of the upper top plate 2 and ensuring that the upper top plate 2 does not move excessively during the ejection process.

[0123] The transverse block 52 connects the longitudinal block 51 to the mold core 3, ensuring the stability and reliability of the shovel 5.

[0124] Furthermore, the guide seat 41 in this invention also includes a limiting unit; the limiting unit is mainly used to limit the position of the guide seat 41 in the mounting slot 21.

[0125] The limiting unit of the present invention includes an end limiting unit and a top limiting unit; in the present invention, the end limiting unit is used for the lateral limiting of the guide seat 41, and the top limiting unit is used for the longitudinal limiting of the guide seat 41; here, the lateral and longitudinal directions are referenced by an upper top plate 2, the longitudinal direction is perpendicular to the upper end surface of the upper top plate 2, and the lateral direction is parallel to the upper end surface of the upper top plate 2.

[0126] In this invention, the end limiting unit includes an end limiting block 44, which is connected to the end of the upper top plate 2 by fasteners; the end limiting block 44 can contact the end face of the guide seat 41; the top limiting unit includes a top limiting block 443, which is connected to the upper top plate 2, and a moving gap is provided between the top limiting block 443 and the bottom surface of the mounting groove 21; the side of the guide seat 41 is inserted into the moving gap by a sliding block 45; by introducing the limiting units (end limiting block 44 and top limiting block 443), the movement range and position of the guide seat 41 are precisely controlled.

[0127] This design not only improves the motion accuracy and reliability of the secondary ejection assembly, but also effectively solves the demolding problem of complex products, thereby improving production efficiency and product quality.

[0128] The limiting unit described in this invention includes two end limiting units and two top surface limiting units.

[0129] The end limiting unit includes an end limiting block 44: the end limiting block 44 is installed at the end of the upper top plate 2 and fixed by fasteners.

[0130] The end limiting block 44 can contact the end face of the guide seat 41 to limit the lateral movement range of the guide seat 41 in the placement groove 21 and prevent the guide seat 41 from leaving the placement groove 21.

[0131] The top surface limiting unit mainly includes a top surface limiting block 443: the top surface limiting block 443 is installed on the upper top plate 2, and there is a moving gap between the top surface limiting block 443 and the bottom surface of the placement groove 21; the top surface limiting block 443 cooperates with the insertion slider 45 on the side of the guide seat 41 through the moving gap to limit the longitudinal movement range of the guide seat 41 in the placement groove 21.

[0132] Meanwhile, the insertion slider 45 and the moving gap work together to better ensure the stability and straightness of the guide seat 41 running in the mounting slot 21.

[0133] The limiting unit can precisely control the movement range of the guide seat 41:

[0134] The end limiting block 44 restricts the lateral movement of the guide seat 41 within the placement groove 21, preventing the guide seat 41 from shifting laterally during the pushing process.

[0135] The top limit block 443, through its movement gap and cooperation with the plug-in slider 45, restricts the longitudinal movement of the guide seat 41 in the placement groove 21, ensuring that the movement of the guide seat 41 is smooth and controllable.

[0136] The design of the limiting unit can effectively prevent the guide seat 41 from exceeding the predetermined range during movement, avoiding jamming or damage caused by excessive movement.

[0137] Furthermore, in this invention, the fastening base 42 includes a fastening base body, which includes an upper connecting block 423, a longitudinal connecting block 422, and a lower connecting block 421. One end of the upper connecting block 423 and the lower connecting block 421 are connected through the longitudinal connecting block 422. The upper connecting block 423, the longitudinal connecting block 422, and the lower connecting block 421 form a lateral opening. The guide seat 41 can be inserted into the lateral opening. The fastening base 42 of this invention is C-shaped or inverted U-shaped. Through the cooperation of the upper connecting block 423 and the longitudinal connecting block 422, a hook structure is formed at the upper end of the fastening base 42, which facilitates the subsequent hook connection with the guide seat 41 and facilitates the subsequent communication between the upper top plate 2 and the lower top plate 1 through the limiting mechanism 4.

[0138] In this invention, the upper connecting block 423 is located on the upper part of the buckle base 42, mainly serving as a limiting function, and can be connected to the guide seat 41 to realize the connection between the guide seat 41 and the buckle base 42.

[0139] The longitudinal connecting block 422 is used to connect the upper connecting block 423 and the lower connecting block 421, serving as a support and connection.

[0140] Lower connecting block 421: Located at the lower part of the buckle base 42, used to connect with the lower top plate 1.

[0141] The upper connecting block 423, the vertical connecting block 422, and the lower connecting block 421 are connected to form an integral structure, which encloses a lateral opening.

[0142] The side opening design allows the guide seat 41 to be inserted therein, thus connecting the guide seat 41 to the buckle seat 42.

[0143] The lateral opening provides the necessary space for the insertion and disengagement of the guide seat 41, allowing the guide seat 41 to connect or disconnect from the buckle seat 42 during the ejection process.

[0144] Furthermore, in this invention, the buckle base 42 is connected to the lower top plate 1 via a plug-in positioning part; the plug-in positioning part includes a part disposed on the lower top plate; the setting of the plug-in positioning part plays a good role in installation positioning and ensures a good installation connection between the buckle base 42 and the lower top plate 1.

[0145] The insertion positioning groove is located at the end of the lower top plate 1 and is used to accommodate the lower connecting block 421 of the buckle base 42.

[0146] The lower connecting block 421 is a part of the machine base 42 and is connected to the lower top plate 1 by inserting a positioning slot.

[0147] The design of the plug-in positioning part ensures that the buckle base 42 can be accurately installed on the lower top plate 1, avoiding positional deviation during the installation process.

[0148] By using a plug-in connection, the connection between the buckle base 42 and the lower top plate 1 is more secure and can withstand the force and movement during the ejection process.

[0149] The design of the plug-in positioning part makes the installation and removal of the buckle base 42 more convenient, and facilitates maintenance and replacement.

[0150] An injection mold assembly includes a lower mold base 7 and a mold core 3; a secondary ejection assembly for the injection mold is provided between the lower mold base 7 and the mold core 3; the lower mold base 7 is the bottom support structure of the injection mold, used to fix and support the entire mold.

[0151] The mold core 3 is the core part of the injection mold, used to mold injection products.

[0152] The secondary ejection assembly is installed between the lower mold base 7 and the mold core 3 to realize the secondary ejection function of the product.

[0153] The function of the secondary ejection assembly:

[0154] One-time ejection: After injection molding is completed, the ejector rod 6 of the injection molding machine pushes the upper ejector plate 2 upward, which drives the lower ejector plate 1 to move upward synchronously, realizing the initial demolding of the product.

[0155] Secondary ejection: The guide seat 41 is moved by the shovel 5, so that the guide seat 41 is disengaged from the buckle seat 42. The upper ejector plate 2 continues to move upward, while the lower ejector plate 1 stops moving, realizing the secondary ejection of the product and ensuring the smooth demolding of complex products.

[0156] The purpose of the secondary ejection assembly disclosed in this invention is to improve products that require internal parting lines to be hidden, solve the problem of shrinkage marks on the product surface BOSS pillars and deep ribs, solve the problem of difficult part removal for products with complex structures, solve the problem of thin wall of mold BOSS pillars and thin ribs, optimize the mold ejection sequence, improve the mold service life, and have greater adaptability to product design.

[0157] The angles of pushing inclined plane 421 and driving inclined plane 53 are 20° to 45°.

[0158] As shown, the present invention provides a secondary ejection assembly for injection molds, which mainly includes an upper ejector plate 2, a lower ejector plate 1, a shovel 5, a clamping base 42, and a guide block.

[0159] Specifically, the injection molding machine comes with ejector rods 6. In actual use, the ejector rods 6 are connected to the upper ejector plate 2. By horizontally arranging multiple ejector rods 6, the force is evenly distributed, ensuring balanced ejection.

[0160] The shovel 5 is fixed to the mold core 3 by fixing screws, and the shovel base 42 is connected to the lower top plate 1 by screws.

[0161] The guide seat 41 is connected to the upper top plate 2 via the mounting slot 21.

[0162] The guide seat 41 can be installed and pressed and fixed by the pressure strip through the mold part guide seat 41, and the movement stroke is limited by the limit block of the guide seat 41 part 6 during operation.

[0163] The injection mold assembly of the present invention, in its specific implementation steps, involves the injection mold entering the mold opening position after injection molding is completed. Once the mold reaches the mold opening position, the automatic ejector pin 6 of the injection molding machine begins to eject under the mechanical force of the injection molding machine. The ejector pin 6 exerts force on the upper ejector plate 2. Under the action of the ejection force, the upper ejector plate 2 and lower ejector plate 1 in the mold move upwards. After a certain stroke, the shovel 5 fixed on the mold core contacts the guide seat 41 fixed on the upper ejector plate 2 of the mold. Under the action of the ejection force, the guide seat 41 in the mold... The return spring 46 is compressed by the seat 41. After the return spring 46 retracts, the gap between the mold guide seat 41 and the buckle seat 42 gradually increases. When the return spring 46 is fully compressed, the buckle seat 42 and the guide seat 41 separate. However, under the force of the injection molding machine ejector rod 6, the upper ejector plate 2 of the mold continues to move. But at this time, the upper and lower fixing plates of the ejector plate have separated. The upper fixing plate can only carry a part of the ejection parts to continue the ejection movement, thereby realizing the secondary ejection movement of the mold. The secondary ejection mold opening action is completed.

[0164] The secondary ejection assembly disclosed in this invention has low structural cost and simple operation. It aims to solve the problems of insufficient space for secondary ejection within the mold, poor mold fitting accuracy, and easy production jamming. At the same time, it has greater adaptability to product design. It improves the reliability of mold production and the accuracy of finished products.

[0165] Obviously, the specific implementation of this invention is not limited to the above-described methods. Any non-substantial improvements made using the inventive concept and technical solution of this invention are within the protection scope of this invention.

Claims

1. A secondary ejection assembly for an injection mold characterized by, This includes the top plate mechanism and the limiting mechanism; The top plate mechanism includes an upper top plate and a lower top plate, and a limiting mechanism is provided between the upper top plate and the lower top plate; The limiting mechanism includes a buckle base connected to the lower top plate; the buckle base is connected to the upper top plate via a guide seat; The upper top plate can drive the lower top plate to move synchronously through a limiting mechanism; The guide seat can be detached from the fastening base; The guide seat is connected to the upper top plate via a connecting unit. The connecting unit includes a mounting slot on the upper top plate, and the guide seat is arranged in the mounting slot. The guide seat is movable within the mounting slot. The guide seat connects to or disconnects from the fastener base by moving within the mounting slot. The secondary ejection assembly also includes an adjustment unit, which includes a shovel mounted on the mold core; the shovel is capable of pushing the guide seat to move on the upper top plate; The guide seat is connected to the upper top plate via an elastic unit; The elastic unit includes a return spring, one end of which is connected to the upper top plate and the other end of which is connected to the guide seat; A guide unit is provided between the shovel and the guide seat. The guide unit includes a push inclined surface disposed on the guide seat. The shovel is provided with a drive inclined surface. The drive inclined surface on the shovel can press against the push inclined surface of the guide seat.

2. A secondary ejection assembly for an injection mold as defined in claim 1, wherein, The guide seat includes a guide seat body, which has a slot for inserting a shovel; the inner wall of the slot has a pushing slope.

3. A secondary ejection assembly for an injection mold as set forth in any of claims 1 or 2, characterized in that, The shovel includes a transverse block and a longitudinal block, the longitudinal block being connected to the mold core via the transverse block; the longitudinal block can be inserted into the insertion slot of the guide seat.

4. A secondary ejection assembly for an injection mold as defined in claim 1, wherein, The guide seat also includes a limiting unit; The limiting unit includes an end limiting unit and a top surface limiting unit; The end limiting unit includes an end limiting block, which is connected to the end of the upper top plate by fasteners; the end limiting block can contact the end face of the guide seat; the top surface limiting unit includes a top surface limiting block, which is connected to the upper top plate, and a moving gap is provided between the top surface limiting block and the bottom surface of the mounting groove. The guide seat is inserted into the moving gap via a sliding block.

5. A secondary ejection assembly for an injection mold as defined in claim 1, wherein, The fastening base includes a fastening base body, which includes an upper connecting block, a longitudinal connecting block, and a lower connecting block. One end of the upper connecting block and the lower connecting block are connected by the longitudinal connecting block. The upper connecting block, the longitudinal connecting block, and the lower connecting block form a lateral opening. The guide seat can be inserted into the lateral opening; The fastener base is connected to the lower top plate via a plug-in positioning part; the plug-in positioning part includes a plug-in positioning groove provided at the end of the lower top plate; the fastener base is plugged into the plug-in positioning groove via a lower connecting block.

6. An injection mold assembly characterized by, It includes a lower mold base and a mold core; a secondary ejection assembly for injection molds as described in any one of claims 1-5 is provided between the lower mold base and the mold core.

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