Injection mold of inward pulling buckle and injection molding method of product with buckle

Abstract

The invention provides an injection mold of an inward-pulling buckle and an injection molding method of a product with the buckle, a buckle forming mechanism is adopted when a buckle structure of the product is formed, the buckle forming mechanism comprises an ejector sleeve inner needle, a middle sleeve and an outer layer sleeve, the ejector sleeve inner needle is provided with a first end and a forming column arranged at the second end of the ejector sleeve inner needle, and the middle sleeve is provided with a second end; the first end of the ejector sleeve inner needle is fixed on the bottom plate, the middle sleeve is sleeved on the periphery of the ejector sleeve inner needle, the first end of the middle sleeve is fixed on the ejector plate group, the second end of the middle sleeve is provided with a plurality of extending straight arms, and the extending straight arms are attached to a forming column of the ejector sleeve inner needle and are provided with inward concave buckle forming parts. The outer layer sleeve is arranged on the periphery of the middle sleeve in a sleeving mode and is in inclined guide fit with the extending straight arm. A product which extends inwards and is small in tripping space can be tripped well; and the demolding yield of the product can be greatly improved.

Description

Technical Field

[0001] The invention relates to the field of injection molds, and in particular to an injection mold with an inner draw-out buckle and an injection molding method for a product with the buckle. Background Art

[0002] Injection molds are tools for producing plastic products; they are also tools that give plastic products a complete structure and precise dimensions. Injection molding is a processing method used in mass production of certain parts with complex shapes. Specifically, it refers to the process of injecting heated and molten plastic into the mold cavity under high pressure by an injection molding machine, and then cooling and solidifying to obtain a molded product. Figure 1 In the product 1 shown, there are multiple buckles 2 at the bottom, and the buckles 2 are arranged inward. The distance between the multiple buckles 2 is too short, and the release structure cannot be well designed at present. The product 1 is easily damaged when it is forced out during demoulding, resulting in poor yield. Summary of the invention

[0003] Therefore, in order to solve the above problems, the present invention provides an injection mold for an inner draw buckle and an injection molding method for a product with a buckle.

[0004] To achieve the above purpose, the technical solution provided by the present invention is as follows:

[0005] An injection mold for an internal draw buckle, comprising a front mold and a rear mold arranged relatively to each other, the rear mold comprising a rear mold plate, a bottom plate fixedly connected to the rear mold plate, and a pin plate group movably arranged between the rear mold plate and the bottom plate, the rear mold plate being equipped with a rear mold core plate; and also comprising at least one group of buckle forming mechanisms, the buckle forming mechanisms comprising an inner needle of a sleeve, an intermediate sleeve and an outer sleeve, the inner needle of the sleeve having a first end and a forming column arranged on its second end, the first end of the inner needle of the sleeve being fixed to the bottom plate, the forming column being sequentially penetrated In the rear template and the rear mold core plate, the middle sleeve is arranged on the outer periphery of the inner needle of the sleeve, the first end of the middle sleeve is fixed on the ejector plate group, and the second end thereof is provided with a plurality of extended straight arms, the extended straight arms are fitted with the forming columns of the inner needle of the sleeve and are provided with inwardly recessed snap-on forming parts, the outer sleeve is arranged on the outer periphery of the middle sleeve, the first end thereof is exposed in the movable space between the rear template and the bottom plate and is provided with a radially protruding limiting protrusion, and the second end thereof is covered on the periphery of the extended straight arms and forms an oblique guide with the extended straight arms.

[0006] Furthermore, a plurality of raised retaining walls are arranged on the periphery of the molding column, and a receiving recess is formed between every two adjacent raised retaining walls. Each receiving recess is matched with an extended straight arm, and in the mold closing state, the extended straight arm is flush with the surface of the raised retaining wall to form an injection molding column.

[0007] Furthermore, the forming column is a conical column whose diameter gradually decreases from the middle to the end.

[0008] Furthermore, a molding protrusion is provided at the end of the molding column, and the diameter of the molding protrusion is smaller than the diameter of the end of the molding column.

[0009] A method for injection molding a product with a buckle, wherein the product has a plurality of buckles distributed in an annular shape and arranged inwardly, the method comprising the following steps:

[0010] S1, providing the injection mold of the inner draw buckle described above for injection molding, and performing injection molding after the front mold and the rear mold are molded together, the molding column of the inner needle of the cylinder and the extended straight arm of the middle sleeve are extended into the molding cavity, and the buckle molding part of the extended straight arm is used for molding the head of the buckle extending inward;

[0011] S2, after the product is cooled and formed, the front mold and the rear mold are separated, and then the ejector plate assembly is ejected forward, and the ejector plate assembly drives the middle sleeve and the outer sleeve to be ejected forward until the limiting convex part of the outer sleeve is abutted and restricted by the rear mold plate, at which time the extended straight arm of the middle sleeve is separated from the surface of the forming column and becomes suspended;

[0012] S3, continue to push the ejector plate assembly forward by an end distance. At this time, the ejector plate assembly drives the middle sleeve to be pushed forward while the inner needle of the sleeve and the outer sleeve are kept, so that the extended straight arm of the middle sleeve retracts inward under the cooperation with the oblique guide of the outer sleeve, thereby separating the buckle forming part from the product;

[0013] S4, eject the product and complete demoulding.

[0014] Furthermore, the rear template includes a first rear template and a second rear template, the second rear template is located between the first rear template and the ejector plate group, the second rear template is connected to the bottom plate and forms a space for the ejector plate group to move, and the first rear template is molded with the front mold to form the molding cavity; the injection mold of the inner draw buckle also includes a linkage mechanism, and the first rear template and the ejector plate group are linked through the linkage mechanism; when in step S2, the ejection of the ejector plate group drives the first rear template to move forward synchronously through the linkage mechanism, while the second rear template remains stationary, and when in step S3, the ejection of the ejector plate group forces the linkage mechanism to release the linkage.

[0015] Furthermore, the linkage mechanism includes a push rod, an elastic buckle and a fixed plate, the push rod is fixed on the ejector plate group, the fixed plate is fixed on the second rear template and extends to the outside of the first rear template, and a first inclined guide surface is formed on the fixed plate, the elastic buckle is installed on the first rear template, and has a second inclined guide surface facing the first inclined guide surface; when in step S2, the ejection of the ejector plate group drives the first rear template to move forward synchronously through the push rod pressing on the elastic buckle; when in step S3, the second inclined guide surface of the elastic buckle cooperates with the first inclined guide surface of the fixed plate, and drives the elastic buckle to retract, thereby releasing the abutment on the push rod, and the ejector plate group and the first rear template are released from linkage.

[0016] Furthermore, the ejector plate group includes a bottom needle plate, a surface needle plate and a push plate connected in sequence from back to front, the bottom needle plate and the surface needle plate are fixedly connected, the surface needle plate and the push plate are connected by a delayed disengagement member, and a push rod for connecting the pushing device passes through the bottom needle plate and the surface needle plate and presses against the push plate, and an ejector or an ejector sleeve is installed on the push plate; in step S2 and step S3, the bottom needle plate, the surface needle plate and the push plate move forward synchronously; in step S4, when the ejector rod continues to push the push plate, the push plate separates from the surface needle plate, and the continued forward movement of the push plate drives the ejector or the ejector sleeve to move forward, thereby ejecting the product.

[0017] Furthermore, a limiting column is fixed on the bottom needle plate or the surface needle plate, and the limiting column extends forward through the push plate. In step S3, the ejector plate assembly continues to be pushed forward an end distance until the limiting column abuts against the rear template and stops.

[0018] Furthermore, the first end of the intermediate sleeve is fixed on the bottom needle plate or the surface needle plate.

[0019] The technical solution provided by the present invention has the following beneficial effects:

[0020] The solution provided in the present application can effectively target the release of products that extend inward and have a small release space; and can greatly improve the demoulding yield of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 Shown is a partial structural schematic diagram of a product in the background technology;

[0022] Figure 2 The figure shows the appearance of the injection mold of the inner draw buckle in the embodiment;

[0023] Figure 3 The figure shows a partial structural cross-sectional view of the injection mold of the inner draw buckle in the embodiment;

[0024] Figure 4 The figure shows the appearance of the buckle forming mechanism in the embodiment in the mold closing state;

[0025] Figure 5 The figure is a schematic diagram of the structure of the buckle forming mechanism in step S2 in the embodiment;

[0026] Figure 6 The figure is a schematic diagram of the structural decomposition of the buckle forming mechanism in the embodiment;

[0027] Figure 7 Shown is a cross-sectional view of an outer sleeve in an embodiment. DETAILED DESCRIPTION

[0028] To further illustrate the various embodiments, the present invention provides drawings. These drawings are part of the disclosure of the present invention, which are mainly used to illustrate the embodiments and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these contents, a person of ordinary skill in the art should be able to understand other possible implementations and advantages of the present invention. The components in the figures are not drawn to scale, and similar component symbols are generally used to represent similar components.

[0029] In the description of the present invention, terms such as "up", "down", "left", "right", "front", "back", etc., and the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention.

[0030] The present invention will now be further described with reference to the accompanying drawings and specific implementation methods.

[0031] The present embodiment provides an injection mold for an inner draw buckle, which is used to form a mold having a Figure 1 Products with buckles shown; refer to Figures 2 to 7 As shown, the injection mold of the inner draw buckle comprises a front mold 10 and a rear mold 20 arranged relatively, the rear mold 20 comprises a rear mold plate 21, a bottom plate 22 fixedly connected to the rear mold plate 21, and an ejector plate group 23 movably arranged between the rear mold plate 21 and the bottom plate 22, and a rear mold core plate 30 is assembled on the rear mold plate 21; when the front mold 10 and the rear mold 20 are molded together, the rear mold core plate 30 participates in enclosing and forming a molding cavity for the injection molded product 1. It also comprises at least one set of buckle molding mechanisms 40, such as two sets of buckle molding mechanisms 40 in this embodiment. Specifically, the buckle forming mechanism 40 includes an inner needle 41 of the sleeve, an intermediate sleeve 42 and an outer sleeve 43. The inner needle 41 of the sleeve has a first end and a forming column 411 arranged on its second end. The first end of the inner needle 41 of the sleeve is fixed on the bottom plate 22. The forming column 411 is successively inserted into the rear template 21 and the rear mold core plate 30. The intermediate sleeve 42 is sleeved on the outer periphery of the inner needle 41 of the sleeve. The first end of the intermediate sleeve 42 is fixed on the ejector plate group 23, and a plurality of extended straight arms 421, specifically four extended straight arms 421, are arranged on the second end. The extended straight arms 421 are in contact with the forming column 411 of the inner needle 41 of the sleeve and are provided with an inwardly recessed buckle forming portion 422. In this way, the forming column 411 and the extended straight arms 421 also participate in the molding of the product 1, and the recessed buckle forming portion 422 of the extended straight arms 421 directly molds the inwardly extending head 3 of the buckle 2 of the product 1.

[0032] The outer sleeve 43 is sleeved on the outer periphery of the middle sleeve 42, and its first end is exposed in the movable space between the rear template 21 and the bottom plate 22 and is provided with a radially protruding limiting protrusion 432, and its second end is covered on the periphery of the extended straight arm 421 and forms an oblique guide fit with the extended straight arm 421. As in this embodiment, the outer side of the extended straight arm 421 is an inclined outer side wall 423, and the outer sleeve 43 has an inclined inner side wall 431; in the mold closing state, the inclined outer side wall 423 of the extended straight arm 421 just fits on the inclined inner side wall 431 of the outer sleeve 43, forming an oblique guide fit (inclined guide fit).

[0033] Based on the above disclosed injection mold for the inner draw buckle, this embodiment also provides an injection molding method for a buckle product, which is used to mold a product having a buckle. Figure 1 The buckle product shown in the figure, specifically, the injection molding method comprises the following steps:

[0034] S1, provide the injection mold of the internal pull-out buckle described above for injection molding, and perform injection molding after the front mold 10 and the rear mold 20 are molded together. The molding column 411 of the inner needle 41 of the sleeve and the extended straight arm 421 of the middle sleeve 42 extend into the molding cavity, and the buckle molding part 422 of the extended straight arm 421 is used to mold the inwardly extending head 3 of the buckle 2 of the molding product 1.

[0035] S2, after the product 1 is cooled and formed, the front mold 10 and the rear mold 20 are separated, and then the ejector plate assembly 23 is ejected forward, and the ejector plate assembly 23 drives the middle sleeve 42 and the outer sleeve 43 to be ejected forward until the limiting protrusion 432 of the outer sleeve 43 is abutted and restricted by the rear mold plate 21. For example, in this embodiment, after the ejector plate assembly 23 is ejected 31mm, the limiting protrusion 432 of the outer sleeve 43 is abutted and restricted by the rear mold plate 21; at this time, the extended straight arm 421 of the middle sleeve 42 is separated from the surface of the molding column 411 to form a suspended state, as shown in FIG. Figure 5 As shown; the outer sleeve 43 can no longer move forward.

[0036] S3, continue to push the ejector plate assembly 23 forward by an end distance. In the present embodiment, the ejection distance is 1.5 mm. At this time, the ejector plate assembly 23 drives the middle sleeve 42 to be pushed forward while the inner needle 41 of the sleeve and the outer sleeve 43 are maintained, so that the extended straight arm 421 of the middle sleeve 42 retracts inwardly under the cooperation with the oblique guide of the outer sleeve 43, thereby making the buckle forming part 422 detach from the product; in this way, the demoulding of the buckle 2 part is completed.

[0037] S4, eject the product and complete demoulding.

[0038] The solution provided in the present application can effectively target the release of products that extend inward and have a small release space; and can greatly improve the demoulding yield of the product.

[0039] The outer periphery of the molding column 411 is provided with a plurality of raised retaining walls 413, specifically four raised retaining walls 413, and a receiving recess 414 is formed between every two adjacent raised retaining walls 413. Each receiving recess 414 is matched with an extended straight arm 421, and in the mold closing state, the extended straight arm 421 is flush with the surface of the raised retaining wall 413 to form an injection molding column; at the same time, a limiting guide function is also formed for the extended straight arm 421 to ensure that the extended straight arm 421 is not easily offset.

[0040] In this embodiment, a molding protrusion 412 is provided at the end of the molding column 411, and the diameter of the molding protrusion 412 is smaller than the diameter of the end of the molding column 411. The molding protrusion 412 is used to form a blind hole of the molding product 1. Of course, in other embodiments, if the product 1 does not have a blind hole structure, the molding protrusion 412 may not be provided.

[0041] Further preferably, in the present embodiment, the rear template 21 includes a first rear template 211 and a second rear template 212, the second rear template 212 is located between the first rear template 211 and the ejector plate group 23, the second rear template 212 is connected to the bottom plate 22 and forms a space for the ejector plate group 23 to move, and the first rear template 211 is used to assemble the rear mold core plate 30. The injection mold of the inner draw buckle also includes a linkage mechanism 50, and the first rear template 211 and the ejector plate group 23 form a linkage through the linkage mechanism 50; when in step S2, the ejection of the ejector plate group 23 drives the first rear template 211 to move forward synchronously through the linkage mechanism 50, while the second rear template 212 remains stationary, so that the product 2 will not be separated from the rear mold core plate 30 in advance, ensuring the stability of the product before the buckle is demolded; when in step S3, the ejection of the ejector plate group 23 forces the linkage mechanism 50 to release the linkage; at this time, the continued ejection of the ejector plate group 23 will not affect the first rear template 211, ensuring that the product can be ejected normally in step S4 and completely demolded. Such a setting further ensures the demolding quality of the product 1.

[0042] Furthermore, a more preferred solution for realizing the above-mentioned action is as follows: the linkage mechanism 50 includes a push rod 51, an elastic buckle 52 and a fixed plate 53, the push rod 51 is fixed on the ejector plate group 23, the fixed plate 53 is fixed on the second rear template 212 and extends to the outside of the first rear template 211, and a first inclined guide surface 531 is formed on the fixed plate 53, the elastic buckle 52 is installed on the first rear template 211, and has a second inclined guide surface 521 facing the first inclined guide surface 531. In this way, when in step S2, the ejection of the ejector plate group 23 is driven forward synchronously by the push rod 51 pressing against the elastic buckle 52; when in step S3, the second inclined guide surface 521 of the elastic buckle 52 cooperates with the first inclined guide surface 531 of the fixed plate 53, and the continued forward movement of the first rear template 211 will force the elastic buckle 52 to overcome the elastic force and retract, thereby releasing the contact with the push rod 51, and further releasing the linkage between the ejector plate group 23 and the first rear template 211; that is, after the ejector plate group 23 moves forward, the first rear template 211 no longer follows. The setting of this linkage mechanism 50 is simple in structure and easy to implement, and the push rod 51, elastic buckle 52 and fixed plate 53 of the linkage mechanism 50 are arranged on the outside of the mold, which will not affect the design and action of other components. Of course, it is not limited to this in other embodiments.

[0043] Specifically, in this embodiment, the ejector plate group 23 includes a bottom needle plate 231, a surface needle plate 232 and a push plate 233 connected in sequence from back to front, the bottom needle plate 231 and the surface needle plate 232 are fixedly connected, and the first end of the intermediate sleeve 42 can be fixed on the bottom needle plate 231 or the surface needle plate 232. In this embodiment, the first end of the intermediate sleeve 42 is fixed on the bottom needle plate 231. The face needle plate 232 and the push plate 233 are connected by a delayed disengagement member (such as a resin shutter), and the push rod 70 for connecting the pushing device passes through the bottom needle plate 231 and the face needle plate 232 and abuts against the push plate 233, on which an ejector pin or an ejector sleeve is mounted; in step S2 and step S3, the bottom needle plate 231, the face needle plate 232 and the push plate 233 move forward synchronously; in step S4, when the push rod 70 continues to push the push plate 233, the push plate 233 separates from the face needle plate 232, and the continued forward movement of the push plate 233 drives the ejector pin or the ejector sleeve to move forward, thereby ejecting the product 2. In this way, the same driving device drives step S2 and step S3. More specifically, a limiting column 60 is fixed on the bottom needle plate 231 or the surface needle plate 232, and the limiting column 60 extends forward through the push plate 233. In step S3, the ejector plate group 23 is continuously pushed forward by one end until the limiting column 60 abuts against the rear template 21 and stops, that is, it cannot move forward any further; at this time, the separation and ejection of the product in step S4 is achieved. The structure using the limiting column 60 realizes stable limiting, and the structure is simple and easy to implement. Specifically, the above-mentioned push rod 51 is fixed on the bottom needle plate 231 and / or the surface needle plate 232.

[0044] Of course, in other embodiments, the structure in which the push plate 233 is separated from the surface needle plate 232 in step S4 is not limited to this. For example, two sets of ejection devices can also be used, one set of ejection devices acts on the bottom needle plate 231, for the operations of steps S2 and S3; the other set of ejection devices acts on the push plate 233, for the operations of step S4, and so on.

[0045] Although the present invention has been specifically shown and described in conjunction with the preferred embodiments, it should be understood by those skilled in the art that various changes may be made to the present invention in form and details without departing from the spirit and scope of the present invention as defined by the appended claims, all of which are within the scope of protection of the present invention.

Claims

1. An injection mold for an internal draw buckle, comprising a front mold and a rear mold arranged opposite to each other, wherein the rear mold comprises a rear mold plate, a bottom plate fixedly connected to the rear mold plate, and an ejector plate group movably arranged between the rear mold plate and the bottom plate, and a rear mold core plate is assembled on the rear mold plate; characterized in that: It also includes at least one group of snap-on forming mechanisms, which include an inner needle of the sleeve, an intermediate sleeve and an outer sleeve, the inner needle of the sleeve having a first end and a forming column arranged on its second end, the first end of the inner needle of the sleeve is fixed on the bottom plate, the forming column is successively passed through the rear template and the rear mold core plate, the intermediate sleeve is sleeved on the outer periphery of the inner needle of the sleeve, the first end of the intermediate sleeve is fixed on the ejector pin plate group, and a plurality of extended straight arms are arranged on the second end thereof, the extended straight arms are fitted with the forming columns of the inner needle of the sleeve and are provided with an inwardly recessed snap-on forming portion, the outer sleeve is sleeved on the outer periphery of the intermediate sleeve, the first end of the outer sleeve is exposed in the movable space between the rear template and the bottom plate and is provided with a radially protruding limiting convex portion, and the second end is covered on the periphery of the extended straight arm and forms an oblique guide with the extended straight arm.

2. The injection mold of the inner draw buckle according to claim 1, characterized in that: The outer periphery of the molding column is provided with a plurality of raised retaining walls, and a receiving recess is formed between every two adjacent raised retaining walls. Each receiving recess cooperates with an extended straight arm, and in the mold closing state, the extended straight arm is flush with the surface of the raised retaining wall to form an injection molding column.

3. The injection mold of the inner draw buckle according to claim 1, characterized in that: A molding protrusion is provided at the end of the molding column, and the diameter of the molding protrusion is smaller than the diameter of the end of the molding column.

4. A method for injection molding a product with a buckle, the product having a plurality of buckles distributed in an annular shape and arranged inwardly, characterized in that: The steps include: S1, providing an injection mold for the inner draw buckle according to any one of claims 1 to 3 for injection molding, and performing injection molding after the front mold and the rear mold are molded together, the molding column of the inner needle of the cylinder and the extended straight arm of the intermediate sleeve are extended into the molding cavity, and the buckle molding part of the extended straight arm is used for molding the head of the buckle extending inward; S2, after the product is cooled and formed, the front mold and the rear mold are separated, and then the ejector plate assembly is ejected forward, and the ejector plate assembly drives the middle sleeve and the outer sleeve to be ejected forward until the limiting convex part of the outer sleeve is abutted and restricted by the rear mold plate, at which time the extended straight arm of the middle sleeve is separated from the surface of the forming column and becomes suspended; S3, continue to push the ejector plate assembly forward by an end distance. At this time, the ejector plate assembly drives the middle sleeve to be pushed forward while the inner needle of the sleeve and the outer sleeve are kept, so that the extended straight arm of the middle sleeve retracts inward under the cooperation with the oblique guide of the outer sleeve, thereby separating the buckle forming part from the product; S4, eject the product and complete demoulding.

5. The method for injection molding a buckle product according to claim 4, characterized in that: The rear template includes a first rear template and a second rear template, the second rear template is located between the first rear template and the ejector plate group, the second rear template is connected to the bottom plate and forms a space for the ejector plate group to move, and the first rear template is used to assemble the rear mold core plate; the injection mold of the inner buckle also includes a linkage mechanism, and the first rear template and the ejector plate group are linked through the linkage mechanism; when in step S2, the ejection of the ejector plate group drives the first rear template to move forward synchronously through the linkage mechanism, while the second rear template remains stationary, and when in step S3, the ejection of the ejector plate group forces the linkage mechanism to release the linkage.

6. The method for injection molding a buckle product according to claim 5, characterized in that: The linkage mechanism includes a push rod, an elastic buckle and a fixed plate, the push rod is fixed on the ejector plate group, the fixed plate is fixed on the second rear template and extends to the outside of the first rear template, and a first inclined guide surface is formed on the fixed plate, the elastic buckle is installed on the first rear template, and has a second inclined guide surface facing the first inclined guide surface; when in step S2, the ejection of the ejector plate group drives the first rear template to move forward synchronously through the push rod pressing on the elastic buckle; when in step S3, the second inclined guide surface of the elastic buckle cooperates with the first inclined guide surface of the fixed plate, and drives the elastic buckle to retract, thereby releasing the abutment against the push rod, and the ejector plate group and the first rear template are released from linkage.

7. The method for injection molding a buckle product according to claim 4, characterized in that: The ejector plate group includes a bottom needle plate, a surface needle plate and a push plate connected in sequence from back to front, the bottom needle plate and the surface needle plate are fixedly connected, the surface needle plate and the push plate are connected by a delayed disengagement member, the ejector rod for connecting the pushing device passes through the bottom needle plate and the surface needle plate and abuts against the push plate, and the push plate is equipped with an ejector or an ejector sleeve; in step S2 and step S3, the bottom needle plate, the surface needle plate and the push plate move forward synchronously; In step S4, when the ejector rod continues to push the push plate, the push plate separates from the face needle plate, and the continued forward movement of the push plate drives the ejector pin or the ejector sleeve to move forward, thereby ejecting the product.

8. The method for injection molding a buckle product according to claim 7, characterized in that: The bottom needle plate or the surface needle plate is fixed with a limiting column, which extends forward through the push plate. In step S3, the ejector plate assembly is continuously pushed forward by an end distance until the limiting column abuts against the rear template and stops.

9. The method for injection molding a buckle product according to claim 7, characterized in that: The first end of the intermediate sleeve is fixed on the bottom needle plate or the surface needle plate.

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