Novel graded core-pulling structure

Abstract

The utility model discloses a novel graded core-pulling structure. A first channel extending in the first direction is arranged in a main insert, a first auxiliary insert is arranged in the first channel and can extend out of a first opening in the second direction, and a second auxiliary insert is arranged in a containing cavity and can extend out of a second opening in the first direction; according to the grading core-pulling structure, the main insert, the first auxiliary insert and the second auxiliary insert are arranged, the first auxiliary insert vertically extends out to be stored, the second auxiliary insert horizontally extends out to be stored, a hole / groove formed by the three inserts can be achieved, and the problem that an existing grading core-pulling structure cannot use the three inserts to form a needed product shape is solved; in addition, after the first pushing block is separated from the first channel, the first auxiliary insert can be stored in the first channel, and the second auxiliary insert can be stored in the storage cavity, so that the main insert can be separated from the injection mold and pulled out.

Description

Technical Field

[0001] The utility model relates to the technical field of stepped core pulling, in particular to a novel stepped core pulling structure. Background Art

[0002] The core pulling structure is generally used in injection molds. Conventional molds generally open and close vertically. After opening, the finished product is ejected by the ejection structure of the mold. However, for castings with side holes / grooves, before opening the mold, the core of this hole / groove needs to be pulled out laterally, and this operation is called core pulling. As injection molded products become more and more complex, a simple core pulling structure can no longer meet the forming requirements of injection molds. For example, a stepped core pulling structure disclosed in CN 218050186 adds a controllable sub-insert on the basis of the main insert by adding a magnet and a spring, realizing a two-stage core pulling structure of two inserts. However, for more complex products, when a three-stage core pulling using three inserts is required, this stepped core pulling structure cannot be achieved and the required product shape cannot be formed. Summary of the Utility Model

[0003] In view of the above defects or deficiencies in the prior art, it is desirable to provide a novel stepped core pulling structure.

[0004] A novel stepped core pulling structure provided by the utility model includes:

[0005] A main insert, having a first channel extending along a first direction inside, one end of the main insert is a forming part, the first channel has an installation opening at the end far from the forming part, and a first opening is provided on the top surface of the main insert far from the installation opening;

[0006] A first sub-insert, disposed in the first channel and capable of extending out from the first opening along a second direction, the second direction is perpendicular to the first direction, the top of the first sub-insert has a receiving cavity, and a second opening is provided on the side of the receiving cavity close to the installation opening;

[0007] A second sub-insert, disposed in the receiving cavity and capable of extending out from the second opening along the first direction;

[0008] A driving mechanism for driving the first sub-insert to move along the second direction and the second sub-insert to move along the first direction.

[0009] According to the technical solution provided by the embodiment of the present application, the driving mechanism includes a first propulsion block disposed inside the first channel, the first propulsion block has a first inclined surface at the end close to the forming part, the bottom end of the first sub-insert has a third inclined surface, and the first inclined surface and the third inclined surface are parallel to each other.

[0010] According to the technical solution provided by the embodiment of the present application, after the first pushing block is withdrawn from the inside of the first channel, the bottom end of the first sub-insert contacts the inner bottom surface of the first channel, and the top surface coincides with the top surface of the main insert. The second sub-insert is placed in the receiving cavity, and the end surface of the second sub-insert away from the molding part coincides with the end surface of the first sub-insert away from the molding part.

[0011] According to the technical solution provided by the embodiment of the present application, the first sub-insert has a second channel extending along the second direction inside, and a second pushing block that can move along the second channel is provided in the second channel. The driving mechanism includes a pushing component, and the pushing component drives the second pushing block to move along the second direction, driving the second sub-insert to move along the first direction.

[0012] According to the technical solution provided by the embodiment of the present application, the receiving cavity communicates with the top of the second channel. The top end of the second pushing block has a fifth inclined surface, and the end of the second sub-insert close to the molding part has a sixth inclined surface, and the fifth inclined surface and the sixth inclined surface are parallel to each other.

[0013] According to the technical solution provided by the embodiment of the present application, the pushing component includes two first installation grooves distributed along the third direction at the end of the first pushing block close to the molding part. Two short rods are rotatably connected to the end of the two first installation grooves close to the first inclined surface through fixed shafts. The extension direction of the axis of the fixed shaft is the third direction. Long rods are rotatably connected to the ends of the two short rods away from the fixed shafts, and the extension direction of the axis of the rotating shaft is the third direction. A slider is provided between the ends of the two long rods away from the short rods. The slider is rotatably connected to the two long rods, and the extension direction of the axis of the rotating shaft is the third direction. The third direction, the second direction, and the first direction are perpendicular to each other;

[0014] The first pushing block has a slideway between the two first installation grooves. The slider is arranged inside the slideway, and the top end and the bottom end are in smooth contact with the top surface and the bottom surface of the slideway respectively. A screw hole penetrating the first pushing block is provided at the end of the slideway away from the short rod. The extension direction of the axis of the screw hole is the first direction. A long screw is threadedly connected inside the screw hole. The long screw is rotatably connected to the slider, and the extension direction of the axis of the rotating shaft is the first direction.

[0015] According to the technical solution provided by the embodiment of the present application, a baffle is provided at the end of the first channel away from the installation port, and the bottom end of the baffle has a second inclined surface parallel to the first inclined surface.

[0016] According to the technical solution provided by the embodiment of the present application, a backstop component is provided at the top of the main insert. When the first inclined surface abuts against the second inclined surface, the backstop component is used to limit the first pushing block from moving away from the forming part side.

[0017] According to the technical solution provided by the embodiment of the present application, the backstop component includes an inverted L-shaped folding plate provided at the top end of the main insert. A receiving groove is provided at the bottom of the inverted L-shaped folding plate. A backstop spring is provided on the inner top surface of the receiving groove. A backstop plate is provided at the bottom end of the backstop spring. A backstop through hole is provided at the top end of the main insert corresponding to the position of the backstop plate. A backstop insertion hole is provided at the top end of the first pushing block. When the first inclined surface abuts against the second inclined surface, the backstop plate passes through the backstop through hole and is inserted into the backstop insertion hole.

[0018] According to the technical solution provided by the embodiment of the present application, a reset component is provided at the end of the second auxiliary insert away from the installation port. When the second pushing block moves downward, it is used to drive the second auxiliary insert to move along the first direction into the receiving cavity.

[0019] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0020] The present utility model is provided with a main insert, a first auxiliary insert and a second auxiliary insert. By vertically extending and retracting the first auxiliary insert and horizontally extending and retracting the second auxiliary insert, a hole / groove formed by the three inserts can be realized, solving the problem that the existing stepped core-pulling structure cannot form the required product shape using three inserts; in addition, when the first pushing block disengages from the first channel, the first auxiliary insert can be retracted into the first channel, and the second auxiliary insert can be retracted into the receiving cavity, enabling the main insert to be disengaged and withdrawn from the injection mold. By providing a pushing component, rotating the long screw rod drives the slider to move, driving the short rod and the long rod to swing, and using the upward movement at the connection of the short rod and the long rod to push the second pushing block upward, not only achieving the purpose of driving the horizontal movement of the second auxiliary insert, but also facilitating the user to better adjust the position of the second auxiliary insert through screw adjustment and self-locking ability. Moreover, a backstop structure is also provided to avoid position movement caused by the pressure of the injection liquid during the injection process, ensuring that the formed hole / groove will not be deformed.

[0021] It should be understood that the content described in the utility model content part is not intended to limit the key or important features of the embodiments of the present utility model, nor is it used to limit the scope of the present utility model. Other features of the present utility model will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] By reading the detailed description of the non-limiting embodiments with reference to the following drawings, other features, objects and advantages of the present utility model will become more obvious:

[0023] Figure 1 Schematic diagram of a novel hierarchical core-pulling structure provided by an embodiment of the present application;

[0024] Figure 2 Schematic diagram of the installation structure of the long screw in a novel hierarchical core-pulling structure provided by an embodiment of the present application;

[0025] Figure 3 Schematic diagram of the installation structure of the second pushing block in a novel hierarchical core-pulling structure provided by an embodiment of the present application;

[0026] Figure 4 is Figure 2 area A in

[0027] Figure 5 Schematic diagram of the structure of the inverted L-shaped folding plate in a novel hierarchical core-pulling structure provided by an embodiment of the present application;

[0028] Figure 6 Schematic diagram of the structure of the first pushing block in a novel hierarchical core-pulling structure provided by an embodiment of the present application.

[0029] Reference numerals in the figure:

[0030] 1. Main insert; 11. First channel; 12. Baffle; 13. Second inclined surface; 14. Anti-back-off through hole; 15. First opening;

[0031] 2. First sub-insert; 21. Second channel; 22. Second pushing block; 23. Third inclined surface; 24. Fourth inclined surface; 25. Fifth inclined surface; 26. Receiving cavity; 27. Second opening

[0032] 3. Second sub-insert; 31. Sixth inclined surface; 32. Short plate; 33. Return spring;

[0033] 4. Driving mechanism; 41. First installation groove; 42. Short rod; 43. Long rod; 44. Slide block; 45. Slideway; 46. Long screw; 47. Ring handle; 48. Threaded hole; 49. Anti-back-off jack; 410. First inclined surface; 411. First pushing block;

[0034] 5. Inverted L-shaped folding plate; 51. Long bolt; 52. Rubber pad; 53. Receiving groove; 54. Anti-back-off plate; 55. Anti-back-off spring; 56. Poking plate. Detailed implementation manners

[0035] The present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the relevant utility model and do not limit the utility model. Additionally, it should be noted that for the convenience of description, only the parts related to the utility model are shown in the drawings.

[0036] It should be noted that, without conflict, the embodiments in the present utility model and the features in the embodiments can be combined with each other. The present utility model will be described in detail below with reference to the drawings and in conjunction with the embodiments.

[0037] Please refer to Figures 1 to 6 , an embodiment of the present utility model provides a novel stepped core-pulling structure, including:

[0038] The main insert 1 has a first channel 11 extending along a first direction inside. One end of the main insert 1 is a forming part. The end of the first channel 11 far from the forming part has an installation opening. A first opening 15 is provided at the top surface of the main insert 1 far from the installation opening. The first direction is Figure 1 the left-right direction in

[0039] The first sub-insert 2 is arranged in the first channel 11 and can extend out from the first opening 15 along a second direction. The second direction is perpendicular to the first direction. The top of the first sub-insert 2 has a receiving cavity 26. A second opening 27 is provided on the side of the receiving cavity 26 close to the installation opening. The second direction is Figure 1 the up-down direction in

[0040] The second sub-insert 3 is arranged in the receiving cavity 26 and can extend out from the second opening 27 along the first direction;

[0041] The driving mechanism 4 is used to drive the first sub-insert 2 to move along the second direction and the second sub-insert 3 to move along the first direction.

[0042] By the vertical extension and retraction of the first sub-insert 2 and the horizontal extension and retraction of the second sub-insert 3, a hole / groove formed by three inserts can be realized, solving the problem that the existing stepped core-pulling structure cannot form the required product shape using three inserts.

[0043] In some embodiments, the driving mechanism 4 includes a first propulsion block 411 arranged inside the first channel 11. The end of the first propulsion block 411 close to the forming part has a first inclined surface 410. The bottom end of the first sub-insert 2 has a third inclined surface 23. The first inclined surface 410 and the third inclined surface 23 are parallel to each other.

[0044] As Figure 2 and Figure 4 shown, when the first propulsion block 411 moves to the left, by the first inclined surface 410 abutting against the third inclined surface 23, the first sub-insert 2 is moved upward, achieving the function of driving the first sub-insert 2 to vertically extend and retract.

[0045] In some embodiments, after the first pushing block 411 is withdrawn from the inside of the first channel 11, the bottom end of the first sub-insert 2 contacts the inner bottom surface of the first channel 11, and the top surface coincides with the top surface of the main insert 1. The second sub-insert 3 is placed in the receiving cavity 26, and the end surface of the second sub-insert 3 away from the molding part coincides with the end surface of the first sub-insert 2 away from the molding part.

[0046] As Figure 3 shown, that is, after the first pushing block 411 is taken out, the first sub-insert 2 can be completely received into the inside of the first channel 11, and the second sub-insert 3 can be completely received into the inside of the receiving cavity 26. Furthermore, it will not interfere with the extraction of the main insert 1 after injection molding, realizing the basic first-stage core-pulling function.

[0047] In some embodiments, the first sub-insert 2 has a second channel 21 extending in the second direction inside. A second pushing block 22 that can move along the second channel 21 is provided in the second channel 21. The driving mechanism 4 includes a pushing assembly. The pushing assembly drives the second pushing block 22 to move along the second direction, driving the second sub-insert 3 to move along the first direction.

[0048] As Figure 4 and Figure 6 shown, through the driving of the pushing assembly, the second sub-insert 3 is stably moved upward, achieving the purpose of extending it out of the first opening 15.

[0049] In some embodiments, the receiving cavity 26 communicates with the top of the second channel 21. The top end of the second pushing block 22 has a fifth inclined surface 25, and the end of the second sub-insert 3 close to the molding part has a sixth inclined surface 31. The fifth inclined surface 25 and the sixth inclined surface 31 are parallel to each other.

[0050] As Figure 2 and Figure 3 shown, during the upward movement of the second pushing block 22, the sixth inclined surface 31 is abutted and pushed by the fifth inclined surface 25, thereby achieving the purpose of pushing the second sub-insert 3 to move to the right. The bottom end of the second pushing block 22 has a fourth inclined surface 24, and the fourth inclined surface 24 is parallel to the first inclined surface 410. Furthermore, when the second pushing block 22 and the first sub-insert 2 are received, when the first pushing block 411 moves to the left, the first inclined surface 410 abuts and slides with the fourth inclined surface 24 and the third inclined surface 23 respectively, achieving the purpose of their upward movement.

[0051] In some embodiments, the pushing component includes two first mounting grooves 41 distributed along a third direction at the end of the first pushing block 411 close to the forming part. At the end of the two first mounting grooves 41 close to the first inclined surface 410, short rods 42 are rotatably connected through fixed shafts. The extension direction of the axis of the fixed shaft is the third direction. At the ends of the two short rods 42 far from the fixed shafts, long rods 43 are rotatably connected, and the extension direction of the axis of the rotating shaft is the third direction. A slider 44 is provided between the ends of the two long rods 43 far from the short rods 42. The slider 44 is rotatably connected to the two long rods 43, and the extension direction of the axis of the rotating shaft is the third direction. The third direction, the second direction, and the first direction are perpendicular to each other. As Figure 6 shown, the third direction is Figure 1 and Figure 6 the front-back direction in

[0052] There is a slideway 45 between the two first mounting grooves 41 where the first pushing block 411 is located. The slider 44 is arranged inside the slideway 45, and the top and bottom are in smooth contact with the top surface and the bottom surface of the slideway 45 respectively. At the end of the slideway 45 far from the short rod 42, a threaded hole 48 penetrating the first pushing block 411 is provided. The extension direction of the axis of the threaded hole 48 is the first direction. A long screw rod 46 is threadedly connected inside the threaded hole 48. At the end of the long screw rod 46 far from the slider 44, a ring handle 47 is provided to facilitate the user to rotate the long screw rod 46. The long screw rod 46 is rotatably connected to the slider 44, and the extension direction of the axis of the rotating shaft is the first direction.

[0053] As Figure 4 and Figure 6 shown, when the user rotates the long screw rod 46, under the action of the thread in the threaded hole 48, the slider 44 can be pushed to move leftward along the slideway 45. At this time, the connection between the short rod 42 and the long rod 43 tilts upward, pushing the fifth inclined surface 25 of the second pushing block 22, achieving the purpose of pushing the second pushing block 22 to move upward. And through the self-locking effect of the threaded connection, the stability after pushing is ensured. In addition, when pulling out the core, the long screw rod 46 can be rotated in the reverse direction to make the short rod 42 and the long rod 43 retracted into the first mounting groove 41, without interfering with the retraction of the second pushing block 22.

[0054] In some embodiments, a baffle 12 is provided at the end of the first channel 11 far from the mounting port. The bottom end of the baffle 12 has a second inclined surface 13 parallel to the first inclined surface 410.

[0055] As Figure 3 shown, by abutting the first inclined surface 410 against the second inclined surface 13, the purpose of blocking the first pushing block 411 is achieved, serving as the preliminary positioning of the first pushing block 411 and facilitating subsequent operations of the pushing component or other structures.

[0056] In some embodiments, a backstop component is provided at the top of the main insert 1. When the first inclined surface 410 abuts against the second inclined surface 13, the backstop component is used to limit the movement of the first pushing block 411 away from the forming part side.

[0057] like Figure 2 and Figure 5 As shown, after the first push block 411 is initially positioned, the first push block 411 is limited to move to the right by the stop assembly, so that the first inclined surface 410 always abuts against the third inclined surface 23, and the fifth inclined surface 25 of the second push block 22 abuts against the sixth inclined surface 31 of the second sub-insert 3, ultimately ensuring that the first sub-insert 2 and the second sub-insert 3 remain stable during the injection molding process.

[0058] In some embodiments, the backstop assembly includes an inverted L-shaped folding plate 5 arranged at the top of the main insert 1, a receiving groove 53 is arranged at the bottom of the inverted L-shaped folding plate 5, a backstop spring 55 is arranged on the top surface of the receiving groove 53, a backstop plate 54 is arranged at the bottom of the backstop spring 55, a backstop through hole 14 is arranged at the position of the backstop plate 54 at the top of the main insert 1, a backstop socket 49 is arranged at the top of the first thrust block 411, and when the first inclined surface 410 abuts against the second inclined surface 13, the backstop plate 54 passes through the backstop through hole 14 and is inserted into the backstop socket 49.

[0059] like Figure 5 As shown, when the backstop plate 54 passes through the backstop through hole 14 and is inserted into the backstop insertion hole 49, the backstop spring 55 is in a normal state, which can limit the first push block 411 from moving to the right during the injection molding process, thereby ensuring that the first sub-insert 2 and the second sub-insert 3 remain stable during the injection molding process. Optionally, a toggle plate 56 is provided at the top of the backstop plate 54 away from the molding end, so that the user can pull the toggle plate 56 to drive the backstop plate 54 to move upward, and the backstop spring 55 is compressed, and the backstop plate 54 is disengaged from the backstop through hole 14, so that the first push block 411 can be moved left and right, which is convenient for operation. Further, optionally, the top end of the inverted L-shaped folding plate 5 is connected to a long bolt 51 by a thread, and the top end of the long bolt 51 is provided with a rubber pad 52. After the main insert 1 is inserted into the mold, the long bolt 51 is rotated to make the rubber pad 52 abut against the upper pressure plate of the mold. The static friction between the two and the self-locking effect of the thread of the long bolt 51 can keep the stability of the main insert 1 after installation.

[0060] In some embodiments, a reset assembly is provided at the end of the second auxiliary insert 3 away from the installation opening, which is used to drive the second auxiliary insert 3 to move along the first direction to the inside of the storage cavity 26 when the second propulsion block 22 moves downward.

[0061] like Figure 3 and Figure 4As shown, the retracted second sub-insert 3 will not interfere with the downward movement of the first sub-insert 2. Optionally, a short plate 32 is provided at the left end of the top surface of the second sub-insert 3, and a return spring 33 is provided at the right end of the short plate 32. The other end of the return spring 33 is connected to the side wall of the storage chamber 26. When the second propulsion block 22 moves upward and abuts against the second sub-insert 3, the return spring 33 is always in a contracted state. After the second propulsion block 22 moves downward, the return spring 33 drives the second sub-insert 3 to move leftward to the inside of the storage chamber 26.

[0062] Usage process: before injection molding, rotate the long screw 46 to store the short rod 42 and the long rod 43 in the first installation groove 41, insert the main insert 1 into the corresponding position of the mold, and then rotate the long bolt 51 to make the rubber pad 52 abut against the upper pressure plate of the mold. Through the static friction between the two and the self-locking effect of the long bolt 51, the stability of the main insert 1 after installation is maintained. Then pull the toggle plate 56 upward, insert the first push block 411 into the first channel 11, and move it to the left until the first inclined surface 410 of the first push block 411 abuts against the second inclined surface 13 of the baffle 12, so as to block the first push block 411 and achieve the purpose of preliminary positioning. Then release the toggle plate 56, and under the action of the stop spring 55, the stop plate 54 passes through the stop hole 14 and is inserted into the stop hole 49 to complete the complete fixation of the first push block 411.

[0063] In addition, when the first propulsion block 411 moves to the left, the first inclined surface 410 of the first propulsion block 411 first abuts against the fourth inclined surface 24 of the second propulsion block 22, pushing the second propulsion block 22 to move upward, and the first propulsion block 411 that continues to move, its first inclined surface 410 abuts against the third inclined surface 23 of the first auxiliary insert 2, pushing the first auxiliary insert 2 to move upward;

[0064] After the first push block 411 is completely fixed, the long screw 46 is rotated, and the screw hole 48 acts on the screw thread to push the slider 44 to move leftward along the slideway 45. At this time, the connection between the short rod 42 and the long rod 43 is tilted, pushing the fifth inclined surface 25 of the second push block 22, so as to push the second push block 22 upward, and then the fifth inclined surface 25 of the second push block 22 abuts and pushes the sixth inclined surface 31, thereby pushing the second auxiliary insert 3 to move rightward, and finally completing the installation of the entire insert, and performing injection molding to obtain the required space / groove;

[0065] When it is necessary to pull the core, first rotate the long screw 46 to store the short rod 42 and the long rod 43 in the first mounting groove 41, and the second push block 22 falls under the action of gravity, and under the action of the reset spring 33, drives the second auxiliary insert 3 to be retracted into the storage chamber 26, and then lift the stop plate 54 to pull out the first push block 411, and the first auxiliary insert 2 is stored in the first channel 11, which will not interfere with the withdrawal of the main insert 1.

[0066] In the description of this specification, terms such as "connection", "installation", "fixation", etc. shall be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0067] In the description of this specification, the description of terms such as "one embodiment", "some embodiments", etc. means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of this application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or instance. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0068] The above are only the preferred embodiments of this application and are not used to limit this application. For those skilled in the art, this application can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of this application shall be included within the protection scope of this application.

Claims

1. A new type of graded core pulling structure, characterized in that: include: A main insert (1) has a first channel (11) extending in a first direction, one end of the main insert (1) is a molding portion, the first channel (11) has a mounting opening away from the molding portion, and a first opening (15) is provided on the top surface of the main insert (1) away from the mounting opening; A first auxiliary insert (2) is arranged in the first channel (11) and can extend from the first opening (15) along a second direction, the second direction being perpendicular to the first direction, the first auxiliary insert (2) having a receiving cavity (26) at the top, and a second opening (27) being provided on the receiving cavity (26) near the mounting opening; A second auxiliary insert (3) is disposed in the receiving cavity (26) and can extend from the second opening (27) along the first direction; A driving mechanism (4) is used for driving the first auxiliary insert (2) to move along the second direction, and the second auxiliary insert (3) to move along the first direction.

2. The new graded core-pulling structure according to claim 1 is characterized in that: The driving mechanism (4) comprises a first propulsion block (411) arranged inside the first channel (11), the first propulsion block (411) having a first inclined surface (410) near the end of the molding portion, and the bottom end of the first auxiliary insert (2) having a third inclined surface (23), the first inclined surface (410) and the third inclined surface (23) being parallel to each other.

3. The new graded core-pulling structure according to claim 2 is characterized in that: When the first pushing block (411) is pulled out of the first channel (11), the bottom end of the first auxiliary insert (2) contacts the bottom surface of the first channel (11), and the top surface coincides with the top surface of the main insert (1); the second auxiliary insert (3) is placed in the receiving cavity (26), and the end surface of the second auxiliary insert (3) away from the molding portion coincides with the end surface of the first auxiliary insert (2) away from the molding portion.

4. The new graded core-pulling structure according to claim 3 is characterized in that: The first auxiliary insert (2) has a second channel (21) extending along the second direction, and the second channel (21) has a second propulsion block (22) movable along the second channel (21). The driving mechanism (4) comprises a propulsion component, and the propulsion component drives the second propulsion block (22) to move along the second direction, thereby driving the second auxiliary insert (3) to move along the first direction.

5. The new graded core-pulling structure according to claim 4 is characterized in that: The receiving cavity (26) is connected to the top of the second channel (21); the top of the second propulsion block (22) has a fifth inclined surface (25); the second auxiliary insert (3) has a sixth inclined surface (31) near the molding portion; the fifth inclined surface (25) and the sixth inclined surface (31) are parallel to each other.

6. The novel graded core-pulling structure according to claim 4 is characterized in that: The pushing assembly comprises two first mounting grooves (41) distributed along a third direction at the first pushing block (411) near the end of the forming portion, the two first mounting grooves (41) near the end of the first inclined surface (410) are both rotatably connected to a short rod (42) through a fixed shaft, the axis extension line of the fixed shaft is in the third direction, the two short rods (42) are both rotatably connected to a long rod (43) away from the fixed shaft end, and the extension direction of the axis of the rotating shaft is the third direction, a slider (44) is provided between the ends of the two long rods (43) away from the short rods (42), the slider (44) is rotatably connected to the two long rods (43), and the extension direction of the axis of the rotating shaft is the third direction, and the third direction, the second direction and the first direction are perpendicular to each other; The first propulsion block (411) is located between the two first mounting grooves (41) and has a slideway (45). The slider (44) is arranged inside the slideway (45), and the top and bottom ends are in smooth contact with the top and bottom surfaces of the slideway (45) respectively. The slideway (45) is provided with a screw hole (48) penetrating the first propulsion block (411) at the end away from the short rod (42). The axis of the screw hole (48) extends in the first direction. A long screw rod (46) is threadedly connected inside the screw hole (48). The long screw rod (46) is rotatably connected to the slider (44), and the axis of the rotating shaft extends in the first direction.

7. The novel graded core-pulling structure according to claim 4 is characterized in that: A baffle (12) is provided at the end of the first channel (11) away from the installation opening, and a second inclined surface (13) parallel to the first inclined surface (410) is provided at the bottom end of the baffle (12).

8. The new graded core-pulling structure according to claim 7 is characterized in that: A backstop assembly is provided on the top of the main insert (1), and when the first inclined surface (410) abuts against the second inclined surface (13), the backstop assembly is used to limit the first propulsion block (411) from moving away from the molding portion.

9. The novel graded core-pulling structure according to claim 8 is characterized in that: The anti-retraction assembly comprises an inverted L-shaped folding plate (5) arranged at the top end of the main insert (1), a receiving groove (53) is arranged at the bottom of the inverted L-shaped folding plate (5), an anti-retraction spring (55) is arranged on the top surface of the receiving groove (53), an anti-retraction plate (54) is arranged at the bottom end of the anti-retraction spring (55), an anti-retraction through hole (14) is arranged at the top end of the main insert (1) corresponding to the position of the anti-retraction plate (54), and an anti-retraction plug hole (49) is arranged at the top end of the first thrust block (411), and when the first inclined surface (410) abuts against the second inclined surface (13), the anti-retraction plate (54) passes through the anti-retraction through hole (14) and is inserted into the anti-retraction plug hole (49).

10. The novel graded core-pulling structure according to claim 5 is characterized in that: The second auxiliary insert (3) is provided with a reset assembly at an end away from the installation opening, which is used to drive the second auxiliary insert (3) to move along the first direction to the inside of the storage cavity (26) when the second propulsion block (22) moves downward.

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