Injection mold ejection structure

Abstract

The invention discloses an injection mold ejection structure, and relates to the technical field of injection molds, the injection mold ejection structure specifically comprises a shell, one end of an inner cavity of the shell is connected with a heat insulation disc, through holes are uniformly formed in the heat insulation disc, first electromagnets are arranged on the inner walls of the through holes, ejector pins are movably connected in the through holes, the ejector pins are divided into two groups, and the ejector pins are arranged in the through holes. The two groups of thimbles are alternately arranged; the inner side of the heat insulation disc is connected with an ejection disc through a first telescopic structure, and holes matched with the ejector pins are evenly formed in the ejection disc. According to the ejection structure of the injection mold, in the ejection process of the injection molding part, the two sets of ejector pins can work alternately, connection between the ejector pins and the injection molding part is removed, then after ejection, the operation that the ejection mechanism is separated from the injection molding part through other devices can be omitted, and the demolding efficiency is improved. And a multi-point ejection mode is adopted, so that the injection molding part can be demolded stably, stress can be dispersed, and the abrasion of the ejector pin is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of injection molds, in particular to an injection mold ejection structure. Background Art

[0002] As the core molding tool of industrial production, molds are known as the mother of industry. They are key equipment for realizing large-scale manufacturing of products through processes such as injection molding, blow molding, and die casting. In essence, they are molding systems composed of precision components, which obtain products of specific shapes by changing the physical state of the material.

[0003] In the injection molding process, the mold ejection system is the core mechanism to ensure the smooth demolding of the product. The current mainstream ejection technology mainly relies on three types of mechanisms: mechanical ejection mechanism, pneumatic assisted ejection system, and hydraulic driven ejection device; however, the existing technology has a significant process bottleneck: when the molten injection material is injected into the mold cavity, the execution end of the ejection mechanism must remain strictly coplanar with the inside of the mold cavity. This structural characteristic causes an interface adhesion effect between the ejection mechanism and the product after cooling and molding, resulting in the need to use other devices to separate the ejection mechanism from the injection molded part after ejection, which reduces the demolding efficiency; the ejector rod of the existing ejector mechanism is usually retractable, but as the ejection length increases, the diameter of the ejector rod decreases, which reduces the strength of the ejector rod, causing the ejector rod to be easily bent or broken, affecting the service life of the ejection structure; based on this, the present application proposes an injection mold ejection structure. Summary of the Invention

[0004] The present invention provides an ejection structure for an injection mold, which solves the problem, as mentioned in the above background art, that an interface adhesion effect occurs between the injection molded part and the ejection mechanism, resulting in the need to use other devices to separate the ejection mechanism from the injection molded part after ejection, thereby reducing the demolding efficiency; and that as the ejection length increases, the strength of the telescopic ejector rod decreases, affecting the service life of the ejection structure.

[0005] The present invention provides the following technical solution: an injection mold ejection structure, comprising a shell, one end of the shell inner cavity is connected to a heat insulation disk, the heat insulation disk is evenly provided with through holes, the inner wall of the through hole is provided with a first electromagnet, and an ejector pin is movably connected in the through hole, and the ejector pins are divided into two groups, and the two groups of ejector pins are alternately arranged; the inner side of the heat insulation disk is connected to the ejector disk through a first telescopic structure, the ejector disk is evenly provided with holes adapted to the ejector pins, and the inner wall of the hole is provided with a second electromagnet, and the ejector pins extend to the outside of the shell away from one end of the ejector disk.

[0006] Preferably, a heat exchange channel is provided in the middle of the shell wall of the shell, the liquid inlet end of the heat exchange channel is connected to the liquid inlet pipe, and the liquid outlet end of the heat exchange channel is connected to the liquid outlet pipe.

[0007] Preferably, a rod-changing structure is provided at one end of the shell away from the heat-insulating disk, and the ejection disk is located between the rod-changing structure and the heat-insulating disk.

[0008] Preferably, the rod-changing structure includes an active block movably connected to the inner cavity of the shell and a limiting sleeve connected to the inner wall of the shell, the active block is connected to the shell through a second telescopic structure, the inner cavity of the limiting sleeve is provided with a plurality of extension rods, and the extension rods are in the same straight line, the limiting sleeve is provided with a slot at one end close to the active block, a moving rod assembly connected to the active block is provided in the slot, a push rod assembly is provided at the end of the limiting sleeve away from the active block, and a limiting assembly is provided on the side of the limiting sleeve close to the active block.

[0009] Preferably, both the end of the extension rod away from the ejector pin and the end of the ejector pin close to the extension rod are provided with a clamping hole, and the end of the extension rod close to the ejector pin is provided with a clamping column adapted to the clamping hole.

[0010] Preferably, the slot is an L-shaped structure, the vertical end of the slot is located in the middle of the limiting sleeve on one side close to the active block, and the horizontal end of the slot is located in the middle of the limiting sleeve away from the push rod assembly.

[0011] Preferably, the outer diameter of the extension rod is the same as the outer diameter of the ejector pin.

[0012] Preferably, the moving rod assembly includes a moving block, one end of which is movably connected to the slotted inner cavity and is provided with an arc groove adapted to the extension rod, one end of the moving block is provided with a third electromagnet, and the other end of the moving block is connected to the active block through a third telescopic structure.

[0013] Preferably, the push rod assembly includes a fourth telescopic structure connected to the inner wall of the shell, the end of the output shaft of the fourth telescopic structure is connected to a push plate, and one end of the push plate away from the fourth telescopic structure is adapted to the extension rod.

[0014] Preferably, the limiting assembly includes a fifth telescopic structure connected to the limiting sleeve and a limiting plate connected to the end of the output shaft of the fifth telescopic structure. The end of the limiting plate away from the output shaft of the fifth telescopic structure is adapted to the extension rod and is movably connected to the limiting sleeve. The distance between the limiting plate and the inner wall of the end of the limiting sleeve away from the push rod assembly is the same as the outer diameter of the extension rod.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. This injection mold ejection structure allows two sets of ejector pins to alternate during the ejection process, releasing the connection between the ejector pins and the molded part. This eliminates the need to separate the ejector mechanism from the molded part using other devices, improving demolding efficiency. The multi-point ejection method allows for smooth demolding of the molded part, disperses stress, and reduces ejector pin wear.

[0016] 2. The ejection structure of the injection mold can change the length of the ejector rod of the ejection structure by setting the rod-changing structure, so that the ejection structure can adapt to various needs and improve the adaptability of the ejection structure. In addition, when the length of the ejector rod is changed, the outer diameter of the ejector rod remains unchanged, thereby ensuring the use strength of the ejector rod and extending the service life of the ejection structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a front view of the structure of the present invention; Figure 2 It is a schematic diagram of the back side of the structure of the present invention; Figure 3 This is a schematic diagram of the internal structure of the present invention; Figure 4 It is a schematic cross-sectional view of the structure of the present invention; Figure 5 This is a schematic diagram of the heat insulation disk structure of the present invention; Figure 6 This is a schematic diagram of the ejection plate structure of the present invention; Figure 7 This is a schematic diagram of the structural limiting sleeve of the present invention; Figure 8 The structure of the present invention Figure 7 Schematic diagram looking up; Figure 9 The structure of the present invention Figure 7 Schematic diagram of cross section front view.

[0018] In the figure: 1. Shell; 2. Heat insulation plate; 3. Fourth telescopic structure; 4. Liquid outlet pipe; 5. Liquid inlet pipe; 6. Second telescopic structure; 7. Limit sleeve; 8. Extension rod; 9. Active block; 10. Limit plate; 11. Push plate; 12. First telescopic structure; 13. Ejector plate; 14. Ejector pin; 15. First electromagnet; 16. Through hole; 17. Hole; 18. Second electromagnet; 19. Fifth telescopic structure; 20. Heat exchange channel; 21. Clamping hole; 22. Slot; 23. Third telescopic structure; 24. Moving block; 25. Clamping column; 26. Third electromagnet. DETAILED DESCRIPTION

[0019] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0020] The present invention provides an embodiment: please refer to Figures 1-9The utility model provides an injection mold ejection structure, including the casing 1, the inner chamber of casing 1 is connected with the heat insulation disc 2 in one end, the heat insulation disc 2 is uniformly provided with the through hole 16, the inner wall of through hole 16 is provided with the first electromagnet 15, the through hole 16 is movably connected with the ejector pin 14, when the first electromagnet 15 is in the electrified state, the first electromagnet 15 and the ejector pin 14 are in the state of magnetic attraction, the first electromagnet 15 and the ejector pin 14 are clearance fit, avoid the first electromagnet 15 to appear abrasion when the ejector pin 14 moves, the size between the first electromagnet 15 and the ejector pin 14 can be set according to demand, not limited here.

[0021] The inner side of heat insulation disc 2 is connected with the ejector plate 13 through the first telescopic structure 12, the first telescopic structure 12 is prior art, just need to satisfy the ability of driving the ejector plate 13 to approach heat insulation disc 2 or away from heat insulation disc 2.Ejector plate 13 is uniformly provided with the hole 17 of adapting with the ejector pin 14, and the inner wall of hole 17 is provided with the second electromagnet 18, when the ejector pin 14 is inserted into hole 17 away from heat insulation disc 2, the second electromagnet 18 and the ejector pin 14 are in the state of clearance fit, the distance between the second electromagnet 18 and the ejector pin 14 can be set according to demand, not limited here.

[0022] From the above description, it can be known that the ejection structure can change the number of movable ejector pins 14 by controlling the electrification number of the second electromagnet 18 when in use.In actual application, the casing 1 is connected with the injection mold, when injecting, the end of the ejector pin 14 away from the ejector plate 13 extends to the outside of the casing 1 and is flush with the inner wall of the cavity of the injection mold, when the injection part needs to be ejected, the ejector pin 14 is divided into two groups, the two groups of ejector pins 14 are alternately arranged, first, the position of one group of ejector pins 14 is fixed by using the first electromagnet 15, under the action of the second electromagnet 18, the other group of ejector pins 14 is connected with the ejector plate 13, the first telescopic structure 12 drives the other group of ejector pins 14 to move through the ejector plate 13, the other group of ejector pins 14 can eject the injection part, and in this process, one group of ejector pins 14 can be separated from the injection part;when one group of ejector pins 14 is separated from the injection part, the second electromagnet 18 matched with one group of ejector pins 14 is in the electrified state, one group of ejector pins 14 ejects the injection part by using the first telescopic structure 12, the first electromagnet 15 matched with the other group of ejector pins 14 is electrified, the second electromagnet 18 matched with the other group of ejector pins 14 is deenergized, the position of the other group of ejector pins 14 is fixed, so that the other group of ejector pins 14 can be separated from the injection part, the injection part is separated from the ejection structure in the ejection process by the operation of the two groups of ejector pins 14 alternately ejecting the injection part, so that the injection part can be directly separated from the ejection structure after being ejected, and the demolding efficiency of the injection part is improved.

[0023] A heat exchange channel 20 is provided in the middle of the shell wall of the housing 1. The liquid inlet of the heat exchange channel 20 is connected to the liquid inlet pipe 5, and the liquid outlet of the heat exchange channel 20 is connected to the liquid outlet pipe 4. This arrangement allows the ejection structure to be connected to an external water circulation cooling device during use. This device injects cooling water into the heat exchange channel 20, using the cooling water to cool the interior of the housing 1. This prevents heat carried by the ejector pin 14 during its reset from affecting the operation of the ejection structure's power source. The water circulation cooling device is publicly available and only needs to circulate cooling water at the required temperature within the heat exchange channel 20.

[0024] A lever-switching mechanism is provided at one end of the housing 1, away from the insulation disk 2. An ejector disk 13 is located between the lever-switching mechanism and the insulation disk 2. The lever-switching mechanism includes an active block 9 movably connected to the interior of the housing 1 and a limiting sleeve 7 connected to the inner wall of the housing 1. The active block 9 is connected to the housing 1 via a second telescopic mechanism 6, which can be extended or retracted to change the position of the active block 9.

[0025] The number of limiting sleeves 7 is the same as the number of ejector pins 14. The inner cavity of the limiting sleeve 7 is provided with a plurality of extension rods 8, and all the extension rods 8 within the limiting sleeve 7 are aligned. The outer diameter of the extension rods 8 is the same as the outer diameter of the ejector pins 14. When the extension rods 8 are in contact with the inner wall of the limiting sleeve 7 near the active block 9, the extension rods 8 and the ejector pins 14 adapted thereto are aligned. Both the end of the extension rod 8 away from the ejector pin 14 and the end of the ejector pin 14 near the extension rod 8 are provided with a latching hole 21. The end of the extension rod 8 near the ejector pin 14 is provided with a latching post 25 adapted to the latching hole 21. Due to the arrangement of the latching post 25 and the latching hole 21, when the latching post 25 is aligned with the latching hole 21 and the latching post 25 moves under the action of an external force, the latching post 25 can be inserted into the latching hole 21, thereby connecting the extension rod 8 to the ejector pin 14 or connecting two adjacent extension rods 8. The ejection length of the ejection structure can be changed, thereby improving the adaptability of the ejection structure.

[0026] The end of the limiting sleeve 7 near the active block 9 is provided with a slot 22, and a shift rod assembly connected to the active block 9 is provided in the slot 22. The slot 22 is an L-shaped structure, and the vertical end of the slot 22 is located on the side of the middle part of the limiting sleeve 7 near the active block 9, and the horizontal end of the slot 22 is located in the middle part of the limiting sleeve 7 near the active block 9. The shift rod assembly includes a moving block 24, one end of which is movably connected to the inner cavity of the slot 22 and is provided with an arc-shaped groove adapted to the extension rod 8. One end of the moving block 24 can be fitted with the extension rod 8. One end of the moving block 24 is provided with a third electromagnet 26. When the third electromagnet 26 is in the energized state, the third electromagnet 26 and the extension rod 8 are in a state of magnetic attraction. At this time, the extension rod 8 is connected to the moving block 24. When the moving block 24 moves, it can drive the extension rod 8 to move. The other end of the moving block 24 is connected to the active block 9 through the third telescopic structure 23.

[0027] It can be seen from the above description that under the action of the second telescopic structure 6, the active block 9 can drive the moving block 24 to move through the third telescopic structure 23. When the moving block 24 moves in the horizontal end of the slot 22, the distance between the extension rod 8 and the ejection disk 13 can be changed, which is convenient for the connection or separation of the extension rod 8 and the ejector pin 14. When the moving block 24 moves in the vertical end of the slot 22, the position of the extension rod 8 in the limit sleeve 7 can be changed, which is convenient for the resetting of the extension rod 8.

[0028] A push rod assembly is provided at the end of the limiting sleeve 7 away from the active block 9, and the push rod assembly includes a fourth telescopic structure 3 connected to the inner wall of the shell 1, and the end of the output shaft of the fourth telescopic structure 3 is connected to a push plate 11, and the end of the push plate 11 away from the fourth telescopic structure 3 is adapted to the extension rod 8. Through the setting of the push rod assembly, under the action of the fourth telescopic structure 3, the push plate 11 can push the extension rod 8 to move, so that the extension rod 8 can be close to the moving rod assembly, so that the extension rod 8 at different positions in the limiting sleeve 7 can be aligned with the ejector pin 14.

[0029] A limiting assembly is provided on the side of the limiting sleeve 7 close to the active block 9, and the limiting assembly includes a fifth telescopic structure 19 connected to the limiting sleeve 7 and a limiting plate 10 connected to the end of the output shaft of the fifth telescopic structure 19. The limiting plate 10 is adapted to the extension rod 8 at one end away from the output shaft of the fifth telescopic structure 19, and is movably connected to the limiting sleeve 7. The distance between the limiting plate 10 and the inner wall of the end of the limiting sleeve 7 away from the push rod assembly is the same as the outer diameter of the extension rod 8. The limiting plate 10 can support and limit the extension rod 8 to prevent the extension rod 8 from being affected by the extension rod 8 adjacent to the moving extension rod 8 when the moving rod assembly moves the extension rod 8, thereby facilitating the extension or shortening of the ejection part of the ejection structure, and when the limiting plate 10 limits the extension rod 8, the moving block 24 is located on the side of the limiting plate 10 close to the vertical end of the slot 22, and the limiting plate 10 will not restrict the moving block 24.

[0030] The first telescopic structure 12, second telescopic structure 6, third telescopic structure 23, and fourth telescopic structure 3 are all publicly known technologies and only need to be able to achieve telescopic function. The first electromagnet 15, second electromagnet 18, and third electromagnet 26 are all high-temperature resistant electromagnets. Their model and power can be selected based on requirements and are not limited here. The distribution of the ejector pins 14 can be configured as needed and is not limited here to prevent damage to the injection molded part during ejection.

[0031] The electrical appliances involved in this application are all existing technologies. Those skilled in the art can select appropriate models according to their needs. No limitation or detailed description is made here. Those skilled in the art understand the working principles and connection methods of the electrical appliances involved in this application. Through these people, all the electrical appliances in this application are connected to their corresponding power supplies through wires, and according to actual conditions, appropriate controllers are selected to meet control requirements. For specific connections and control sequences, please refer to the description below. The electrical connections between the electrical components are completed in a sequential working order. The detailed connection methods are well known in the art. The following mainly introduces the working principles and processes, and no further explanation of electrical appliance control is given.

[0032] In summary, when the injection mold ejection structure is in use, it is connected to the injection mold. During injection molding, the end of the ejector pin 14 away from the ejector plate 13 is strictly coplanar with the inner wall of the injection mold cavity. When the molded part needs to be ejected, when the ejector pin 14 is connected to the molded part, the first telescopic structure 12 drives the ejector plate 13 to move the ejector pin. When the ejector plate 13 moves, half of the second electromagnets 18 are energized, and half of the first electromagnets 15 are energized. The energized second electromagnets 18 and the unenergized second electromagnets 18 are staggered, and the energized first electromagnets 15 and the unenergized first electromagnets 15 are staggered. That is, when the ejector plate 13 moves, the two groups of ejector pins 14 work alternately. While one group of ejector pins 14 is ejecting the molded part, the position of the other group of ejector pins 14 remains unchanged, allowing the molded part to be separated from the other group of ejector pins 14, thereby achieving separation of the ejection structure from the molded part during the ejection process.

[0033] After the ejection structure is separated from the injection molded part, all the first electromagnets 15 are in the power-off state. At the same time, the second electromagnet 18 is in the power-on state, so that all the ejectors 14 eject the injection molded part together. During the movement of the ejector 14, the extension rod 8 aligned with the ejector 14 is driven by the shifting rod assembly until the extension rod 8 is engaged with the ejector 14. When the first telescopic structure 12 is retracted to the limit position, the second electromagnet 18 is in the power-off state, releasing the restriction on the ejector 14, and the third electromagnet 26 is in the power-on state. The ejector rod formed by the ejector pin 14 and the extension rod 8 continues to push the injection molded part to move under the action of the shift rod assembly, and the first telescopic structure 12 extends until the ejection disk 13 is reset. After the moving block 24 moves to the extreme position, the second electromagnet 18 is in the energized state and the third electromagnet 26 is in the de-energized state. The ejector rod continues to move under the action of the first telescopic structure 12, and the second telescopic structure 6 drives the moving block 24 to reset; the ejection structure formed by the first telescopic structure 12 and the ejection disk 13 and the shift rod assembly can work alternately to facilitate the ejection of the injection molded part.

[0034] The standard parts used in the present invention are all purchased from the market according to actual application requirements, and special-shaped parts can be customized according to the description in the specification and drawings. The specific connection method of each structure adopts conventional technical means such as mature bolt connection in the existing technology. The machinery, parts and equipment all adopt conventional models in the existing technology, which will not be described in detail here, and the materials of the various structural components of this application can be selected according to requirements, without limitation. The contents not described in detail in this specification belong to the existing technology known to professional and technical personnel in this field. Although the embodiments of the present invention have been shown and described, it can be understood by ordinary technicians in this field that various changes, modifications, replacements and modifications can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the attached claims and their equivalents.

Claims

1. An injection mold ejection structure, comprising a housing (1), characterized in that: One end of the inner cavity of the shell (1) is connected to a heat insulation disk (2), and through holes (16) are evenly provided on the heat insulation disk (2). The inner wall of the through hole (16) is provided with a first electromagnet (15), and a ejector pin (14) is movably connected in the through hole (16). The ejector pins (14) are divided into two groups, and the two groups of ejector pins (14) are alternately provided. The inner side of the heat insulation disk (2) is connected to an ejection disk (13) through a first telescopic structure (12), and holes (17) adapted to the ejector pins (14) are evenly provided on the ejection disk (13), and a second electromagnet (18) is provided on the inner wall of the hole (17). The ejector pin (14) extends to the outside of the shell (1) away from one end of the ejection disk (13).

2. The injection mold ejection structure according to claim 1, characterized in that: A heat exchange channel (20) is provided in the middle of the shell wall of the shell (1); the liquid inlet end of the heat exchange channel (20) is connected to a liquid inlet pipe (5), and the liquid outlet end of the heat exchange channel (20) is connected to a liquid outlet pipe (4).

3. The injection mold ejection structure according to claim 1, characterized in that: A rod-changing structure is provided at one end of the housing (1) away from the heat-insulating disc (2), and the ejection disc (13) is located between the rod-changing structure and the heat-insulating disc (2).

4. The injection mold ejection structure according to claim 3, characterized in that: The rod-changing structure comprises an active block (9) movably connected to the inner cavity of the shell (1) and a limiting sleeve (7) connected to the inner wall of the shell (1), the active block (9) is connected to the shell (1) through a second telescopic structure (6), the inner cavity of the limiting sleeve (7) is provided with a plurality of extension rods (8), the extension rods (8) are on the same straight line, the end of the limiting sleeve (7) close to the active block (9) is provided with a slot (22), the slot (22) is provided with a shifting rod assembly connected to the active block (9), the end of the limiting sleeve (7) away from the active block (9) is provided with a push rod assembly, and the side of the limiting sleeve (7) close to the active block (9) is provided with a limiting assembly.

5. The injection mold ejection structure according to claim 4, characterized in that: The end of the extension rod (8) away from the ejector pin (14) and the end of the ejector pin (14) close to the extension rod (8) are both provided with a clamping hole (21), and the end of the extension rod (8) close to the ejector pin (14) is provided with a clamping column (25) adapted to the clamping hole (21).

6. The injection mold ejection structure according to claim 5, characterized in that: The slot (22) is an L-shaped structure, the vertical end of the slot (22) is located in the middle of the limiting sleeve (7) on one side close to the active block (9), and the horizontal end of the slot (22) is located in the middle of the limiting sleeve (7) away from the end of the push rod assembly.

7. The injection mold ejection structure according to claim 5, characterized in that: The outer diameter of the extension rod (8) is the same as the outer diameter of the ejector pin (14).

8. The injection mold ejection structure according to claim 4, characterized in that: The moving rod assembly includes a moving block (24), one end of which is movably connected to the inner cavity of the slot (22) and is provided with an arc groove adapted to the extension rod (8), one end of the moving block (24) is provided with a third electromagnet (26), and the other end of the moving block (24) is connected to the active block (9) via a third telescopic structure (23).

9. The injection mold ejection structure according to claim 4, characterized in that: The push rod assembly comprises a fourth telescopic structure (3) connected to the inner wall of the housing (1); the end of the output shaft of the fourth telescopic structure (3) is connected to a push plate (11); and one end of the push plate (11) away from the fourth telescopic structure (3) is adapted to the extension rod (8).

10. The injection mold ejection structure according to claim 4, characterized in that: The limiting assembly comprises a fifth telescopic structure (19) connected to the limiting sleeve (7) and a limiting plate (10) connected to the end of the output shaft of the fifth telescopic structure (19); the end of the limiting plate (10) away from the output shaft of the fifth telescopic structure (19) is adapted to the extension rod (8) and is movably connected to the limiting sleeve (7); the distance between the limiting plate (10) and the inner wall of the end of the limiting sleeve (7) away from the push rod assembly is the same as the outer diameter of the extension rod (8).

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