Automatically cut off the injection mold

Abstract

The utility model discloses an injection mold for automatically cutting off the material head in the mold, comprising: a rear mold, a front mold and an ejection mechanism, the ejection mechanism comprising an upper ejector plate, a lower ejector plate, an inclined ejector assembly, a straight ejector assembly and a material head ejector pin, the inclined ejector assembly comprising an inclined ejector block and an inclined ejector rod, the bottom and side of the inclined ejector block are provided with a glue inlet flow channel leading to the cavity; the inclined ejector rod slides obliquely and inserts into the rear mold, the upper end of the inclined ejector rod is fixedly connected to the inclined ejector block, and the lower end thereof is slidably mounted on the lower ejector plate; the straight ejector assembly is fixedly connected to the upper ejector plate, and the straight ejector assembly is at the bottom of the cavity; the material head ejector pin is fixedly connected to the lower ejector plate, and the material head ejector pin is at the bottom of the glue inlet flow channel; the upper ejector plate is located at the top of the lower ejector plate, and a limiting screw is arranged between the upper ejector plate and the lower ejector plate. The utility model can realize automatic cutting off of the material head in the mold, shorten the product processing cycle, reduce the cost, and facilitate the removal of the material head.

Description

Technical Field

[0001] The utility model relates to the technical field of injection molds, in particular to an injection mold with automatic cutting off of a material head in a mold. Background Art

[0002] An injection mold is a device for producing plastic products. It injects molten plastic material from the mold hot nozzle through the glue inlet channel into the mold cavity, and then cools and solidifies it to obtain a plastic product of the desired shape and size. It has been widely used in various fields such as automobiles, electronics, medical treatment, and home appliances. It is an indispensable and important process equipment in modern manufacturing.

[0003] As the plastic product is cooled and formed, the molten plastic in the glue feed channel will also cool to form a slug, which will be connected to the product as a whole. At present, the following methods are generally used to handle the slug: 1) Manual cutting, where the operator manually cuts off the slug with the help of tools; 2) Mechanical cutting, where the slug is cut off from the injection molded part using mechanical tools such as automatic shears; 3) Thermal cutting, where the slug is heated to soften it, and then cut off with a cutter or other tool. The above slug cutting methods will increase the product production process, increase the product processing cycle, and consume more labor, increasing production costs. Therefore, it is necessary to improve the prior art to overcome the defects in the prior art. Utility Model Content

[0004] The problem to be solved by the utility model is to provide an injection mold with an automatic cutting off of the in-mold slug, so as to overcome the defects of the existing slug cutting method that the product processing cycle is increased, the time and labor are wasted, and the production cost is high.

[0005] The utility model adopts a technical solution to solve the technical problem: an injection mold for automatically cutting off a material head in a mold, comprising: a rear mold, a front mold and an ejection mechanism, a cavity for molding a product is formed between the rear mold and the front mold, the ejection mechanism comprises an upper ejector plate, a lower ejector plate, an inclined ejector assembly, a straight ejector assembly for ejecting a product and an ejector pin for ejecting a material head, the inclined ejector assembly comprises an inclined ejector block and an inclined ejector rod, the inclined ejector block is installed on the rear mold and is located on one side of the cavity, and the bottom and side of the inclined ejector block are distributed There is a glue inlet channel leading to the cavity; the inclined ejector rod is obliquely slidably inserted into the rear mold, the upper end of the inclined ejector rod is fixedly connected to the inclined ejector block, and the lower end thereof is slidably mounted on the lower ejector plate; the straight ejector assembly is fixedly connected to the upper ejector plate, and the straight ejector assembly is located at the bottom of the cavity; the material head ejector pin is fixedly connected to the lower ejector plate, and the material head ejector pin is located at the bottom of the glue inlet channel; the upper ejector plate is located at the top of the lower ejector plate, and a limiting screw is arranged between the upper ejector plate and the lower ejector plate.

[0006] As a further improvement of the utility model, an inclined ejector seat is fixedly installed at the bottom of the lower ejector plate, and a limiting slide groove is arranged between the inclined ejector seat and the lower ejector plate, and the extension direction of the limiting slide groove is perpendicular to the opening and closing direction of the injection mold; a sliding block is installed at the lower end of the inclined ejector rod, and the sliding block is slidably fitted in the limiting slide groove.

[0007] As a further improvement of the utility model, the straight ejector assembly includes a straight ejector block and product ejectors distributed along the direction of mold opening and closing, the straight ejector block is installed on the rear mold and is located at the bottom of the cavity, the upper end of the product ejector is fixedly connected to the straight ejector block, and the lower end of the product ejector is fixedly connected to the upper ejector plate.

[0008] As a further improvement of the present invention, the limit screw passes through the lower ejector plate and is fixed to the bottom of the upper ejector plate, and the head of the limit screw is located below the lower ejector plate to cooperate with the bottom surface of the lower ejector plate to form a stop limit.

[0009] As a further improvement of the utility model, the injection mold for automatically cutting off the in-mold material head also includes a bottom plate, the rear mold is fixed to the bottom plate by a square iron, and the upper ejector plate and the lower ejector plate are both movably arranged between the bottom plate and the rear mold.

[0010] As a further improvement of the utility model, a mounting block is fixed on one side of the base plate, and a limit hook is rotatably installed on the mounting block. A limit block is fixed on one side of the lower ejector plate, and when the mold is closed, the limit hook is engaged with the limit block; a shift block is fixed on one side of the upper ejector plate, and when the upper ejector plate moves upward, the upper ejector plate can drive the shift block to shift the limit hook to rotate, so that the limit hook disengages from the limit block.

[0011] As a further improvement of the utility model, the mounting block is U-shaped, and the lower end of the limit hook is rotatably arranged in the groove of the mounting block through a pin shaft; an avoidance groove is provided on the limit block, and the upper end of the limit hook is clamped on the top outer side of the avoidance groove, and the lower end of the shift block extends into the avoidance groove and is located between the limit block and the limit hook.

[0012] As a further improvement of the utility model, the shift block is provided with an inclined surface, and when the shift block moves upward following the upper ejector plate, the shift block pushes the limit hook to rotate outward through the inclined surface.

[0013] As a further improvement of the utility model, an inclined guide column parallel to the inclined ejector rod is fixed to the bottom of the inclined ejector block, an inclined guide hole is provided on the rear mold, and the inclined guide column is inserted into the inclined guide hole.

[0014] As a further improvement of the utility model, the upper ejector plate is provided with a long hole for avoiding the inclined ejector rod.

[0015] The beneficial effects of the utility model are as follows: the utility model provides an injection mold for automatically cutting off a slug in a mold, which is provided with an upper ejector plate, a lower ejector plate, an inclined ejector assembly, a straight ejector assembly and a slug ejector pin, and a glue inlet flow channel is provided at the bottom of the inclined ejector block. When the straight ejector assembly ejects the product upward, it can tear off the connection between the slug and the product at the gate position, thereby realizing automatic cutting off of the slug in the mold, reducing manual participation in trimming the slug, shortening the product processing cycle, and reducing the manufacturing cost of the product. Moreover, the structural design is reliable and will not increase the volume of the mold. Moreover, after the slug is cut off, the upper ejector plate will drive the lower ejector plate to move upward synchronously, and the slug will be ejected upward and separated from the rear mold by the slug ejector pin. At the same time, the lower ejector plate will eject the inclined ejector block upward while causing the inclined ejector block to slide laterally in a direction perpendicular to the ejection direction, so that the inclined ejector block leaves the top of the slug, thereby facilitating the removal of the slug. In addition, the utility model is provided with a locking mechanism on one side of the upper ejector plate, the lower ejector plate and the bottom plate, so as to ensure that the upper ejector plate moves first and the lower ejector plate remains stationary in a certain distance at the beginning of ejection, so as to ensure that the material head can be completely cut off. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a three-dimensional diagram of the rear mold part of the injection mold that is automatically cut off by the mold head in the utility model;

[0017] Figure 2 It is a three-dimensional diagram of the ejection mechanism and the bottom plate in the utility model;

[0018] Figure 3 It is a three-dimensional diagram of the ejection mechanism in the utility model;

[0019] Figure 4 For this utility model Figure 3 Enlarged view of part A in the middle;

[0020] Figure 5 It is an exploded view of the inclined ejector assembly and the lower ejector plate in the utility model;

[0021] Figure 6 For this utility model Figure 2 Enlarged view of middle part B;

[0022] Figure 7 It is a cross-sectional view of the mounting block, the limiting hook, the limiting block and the shifting block in the utility model.

[0023] Combined with the attached drawings, the following description is given:

[0024] 1. Rear mold; 2. Upper ejector plate; 201. Long hole; 3. Lower ejector plate; 301. Limiting slide; 4. Material head ejector; 5. Inclined ejector block; 6. Inclined ejector rod; 7. Limiting screw; 8. Inclined ejector seat; 9. Slider; 10. Straight ejector block; 11. Product ejector; 12. Bottom plate; 13. Square iron; 14. Mounting block; 15. Limiting hook; 1501. Second chamfer; 16. Limiting block; 1601. Avoidance groove; 17. Diverter block; 1701. Inclined surface; 1702. First chamfer; 18. Inclined guide column; 19. Material head; 20. Ejector column. DETAILED DESCRIPTION

[0025] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings.

[0026] See also Figure 1 The utility model provides an injection mold for automatically cutting off the in-mold material head, comprising: a rear mold 1, a front mold, a runner plate, a bottom plate 12 and an ejection mechanism, wherein the front mold and the runner plate are not shown in the drawings, and both adopt the existing conventional technology. The rear mold 1 is fixed to the bottom plate 12 by a square iron 13, and a cavity for molding products is formed between the rear mold 1 and the front mold.

[0027] See also Figures 1 to 4 The ejection mechanism includes an upper ejector plate 2, a lower ejector plate 3, an inclined ejector assembly, a straight ejector assembly and a material head ejector 4. The upper ejector plate 2 and the lower ejector plate 3 are both movably arranged between the bottom plate 12 and the rear mold 1. In the mold closing state, the lower ejector plate 3 is against the top surface of the bottom plate 12.

[0028] The lifter assembly includes a lifter block 5 and a lifter rod 6. The lifter block 5 is mounted on the rear mold 1 and is located on one side of the cavity. The bottom and side of the lifter block 5 are provided with a plastic inlet channel leading to the cavity. The molten plastic is injected into the cavity through the plastic inlet channel. The lifter rod 6 slides obliquely through the rear mold 1. The upper end of the lifter rod 6 is fixedly connected to the lifter block 5, and the lower end thereof is slidably mounted on the lower ejector plate 3.

[0029] Furthermore, the straight ejector assembly is fixedly connected to the upper ejector plate 2, and the straight ejector assembly is located at the bottom of the cavity, and is used to eject the product formed by cooling in the cavity. The material head ejector pin 4 is fixedly connected to the lower ejector plate 3, and the material head ejector pin 4 is located at the bottom of the glue inlet flow channel, and is used to eject the material head 19 formed by cooling in the glue inlet flow channel. Among them, both the straight ejector assembly and the material head ejector pin 4 can be provided in plurality.

[0030] In this embodiment, the straight ejector assembly includes a straight ejector block 10 and product ejector pins 11 distributed along the mold opening and closing direction (i.e., the vertical direction shown in the figure). The straight ejector block 10 is installed on the rear mold 1 and is at the bottom of the cavity. The upper end of the product ejector pin 11 is fixedly connected to the straight ejector block 10, and the lower end of the product ejector pin 11 is fixedly connected to the upper ejector plate 2.

[0031] In this embodiment, the upper ejector plate 2 is located on the top of the lower ejector plate 3, and a limit screw 7 is provided between the upper ejector plate 2 and the lower ejector plate 3. In addition, a plurality of ejector posts 20 are fixed to the bottom of the upper ejector plate 2, and the ejector posts 20 are connected to the power device after passing through the lower ejector plate 3; wherein the ejector posts 20 and the lower ejector plate 3 are clearance-matched.

[0032] After the product is cooled and formed, the rear mold 1 is opened relative to the front mold, and then the power device pushes the upper ejector plate 2 upward through the ejector column 20, and the upper ejector plate 2 ejects the product upward from the rear mold 1 through the straight ejector assembly; in this process, the lower ejector plate 3 and the inclined ejector assembly and the slug ejector 4 connected thereto do not move. Since the glue feed channel is at the bottom of the inclined ejector block 5, that is to say, the slug 19 cooled and formed in the glue feed channel will be pressed by the inclined ejector block 5, when the straight ejector assembly ejects the product upward, the connection between the slug 19 and the product can be torn off at the gate position, thereby realizing automatic cutting of the slug 19 in the mold, reducing manual participation in trimming the slug 19, shortening the product processing cycle, and reducing the manufacturing cost of the product. Moreover, the structural design is reliable and will not increase the mold volume.

[0033] After the material head 19 is cut off, when the limit screw 7 stops at the bottom of the lower ejector plate 3, the upper ejector plate 2 will drive the lower ejector plate 3 to move upward synchronously, and the lower ejector plate 3 will eject the material head 19 upward and out of the rear mold 1 through the material head ejector 4; in this process, with the cooperation of the inclined ejector rod 6 and the rear mold 1, the lower ejector plate 3 will eject the inclined ejector block 5 upward while sliding the inclined ejector block 5 laterally in a direction perpendicular to the ejection direction, so that the inclined ejector block 5 leaves the top of the material head 19, thereby facilitating the removal of the material head 19.

[0034] See also Figure 5 The bottom of the lower ejector plate 3 is fixedly installed with an inclined ejector seat 8, and a limiting slide groove 301 is arranged between the inclined ejector seat 8 and the lower ejector plate 3. The extension direction or the length direction of the limiting slide groove 301 is perpendicular to the opening and closing direction of the injection mold. The lower end of the inclined ejector rod 6 is installed with a slider 9, which is slidably fitted in the limiting slide groove 301. Under the action of the limiting slide groove 301, the slider 9 can only slide left and right along the length direction of the limiting slide groove 301, so as to realize the inclined ejector assembly to slide sideways while ejecting.

[0035] In addition, an inclined guide column 18 parallel to the inclined ejector rod 6 is fixed to the bottom of the inclined ejector block 5, and an inclined guide hole is provided on the rear mold 1. The inclined guide column 18 is inserted into the inclined guide hole. The guiding effect of the inclined guide column 18 and the inclined guide hole improves the stability of the movement of the inclined ejector assembly.

[0036] See also Figure 2 A long hole 201 is provided on the upper ejector plate 2, and the inclined ejector rod 6 passes through the long hole 201 and is slidably connected to the lower ejector plate 3. The long hole 201 is used to avoid the inclined ejector rod 6, and provides space for lateral movement of the inclined ejector rod 6 when the inclined ejector assembly slides laterally.

[0037] See also Figure 3 , the upper end of the limit screw 7 passes through the lower ejector plate 3 in the vertical direction and is fixed to the bottom of the upper ejector plate 2, wherein the limit screw 7 and the lower ejector plate 3 are clearance-matched. The lower end of the limit screw 7 is an annular head, which is located below the lower ejector plate 3, and there is a certain distance between the two. During the ejection process, when the upper ejector plate 2 drives the limit screw 7 to move upward, until the head of the limit screw 7 is abutted against the bottom surface of the lower ejector plate 3 to form a stop limit, the upper ejector plate 2 is then driven by the limit screw 7 to move the lower ejector plate 3 synchronously upward. Among them, a plurality of limit screws 7 may be provided.

[0038] In order to ensure that the upper ejector plate 2 moves first and the lower ejector plate 3 remains stationary in a certain distance at the beginning of ejection, the utility model is provided with a locking mechanism on one side of the upper ejector plate 2, the lower ejector plate 3 and the bottom plate 12 to ensure that the material head 19 can be completely cut off.

[0039] See also Figure 2 , Figure 6 and Figure 7 The locking mechanism includes a mounting block 14, a limit hook 15, a limit block 16 and a shifting block 17. The mounting block 14 is fixed to one side of the bottom plate 12, the limit block 16 is fixed to one side of the lower ejector plate 3 and is located above the mounting block 14, and the limit hook 15 is rotatably mounted on the mounting block 14. When the mold is closed, the limit hook 15 is clamped on the limit block 16, thereby locking the lower ejector plate 3 at the top of the bottom plate 12, ensuring that the lower ejector plate 3 remains stationary in a certain distance at the beginning of ejection. The shifting block 17 is fixed to one side of the upper ejector plate 2. When the upper ejector plate 2 moves upward, the upper ejector plate 2 can drive the shifting block 17 to shift the limit hook 15 outward, so that the limit hook 15 is separated from the limit block 16, thereby releasing the lock on the lower ejector plate 3. Next, the upper ejector plate 2 can drive the lower ejector plate 3 to move upward synchronously through the limit screw 7.

[0040] Specifically, the mounting block 14 is U-shaped, and its groove is arranged toward the bottom plate 12. The lower end of the limit hook 15 is rotatably arranged in the groove of the mounting block 14 through a pin shaft. The side of the limit block 16 facing away from the lower ejector plate 3 is provided with an avoidance groove 1601. The upper end of the limit hook 15 is a hook portion, the width of which is greater than the width of the avoidance groove 1601, and the hook portion is clamped on the top outer side of the avoidance groove 1601.

[0041] like Figure 7 As shown, the shift block 17 is arranged in the vertical direction, and its upper end is fixedly connected to the upper ejector plate 2 by screws, and its lower end is provided with a shift head with increased thickness, which extends vertically downward into the avoidance groove 1601 and is located between the limit block 16 and the limit hook 15.

[0042] Among them, the top of the shifting head of the shifting block 17 is provided with an inclined surface 1701, and in the mold closing state, the hook portion of the limit hook 15 is above the inclined surface 1701. In a certain distance at the beginning of ejection, when the shifting block 17 moves upward with the upper ejector plate 2, the shifting block 17 pushes the limit hook 15 to gradually rotate outward through the inclined surface 1701 until the limit hook 15 completely disengages from the limit block 16, thereby releasing the lock on the lower ejector plate 3; in the subsequent process of the upper ejector plate 2 continuing to move upward, until the head of the limit screw 7 is pressed against the bottom surface of the lower ejector plate 3 to form a stop limit, at this time, the material head 19 has been cut off, and then the upper ejector plate 2 drives the lower ejector plate 3 to move upward synchronously through the limit screw 7.

[0043] like Figure 7 As shown, the bottom of the shifting head of the shifting block 17 is provided with a first chamfer 1702, and the top of the hook portion of the limit hook 15 is provided with a second chamfer 1501. The second chamfer 1501 and the first chamfer 1702 are both chamfered angles with the same slope. The injection mold of this embodiment is placed horizontally in actual use, and the locking mechanism is on the upper side ( Figure 7 After the ejection mechanism is ejected, that is, after the shift block 17 leaves the limit hook 15, the limit hook 15 will swing downward due to its own gravity. When resetting, the first chamfer 1702 cooperates with the second chamfer 1501 so that the shift head of the shift block 17 can slide over the hook part of the limit hook 15 and return to the avoidance groove 1601 of the limit block 16.

[0044] like Figure 1 As shown, the injection mold of this embodiment has two cavities and can mold two products at the same time.

[0045] It can be seen that the injection mold for automatic cutting off of the material head in the mold of the utility model is provided with an upper ejector plate 2, a lower ejector plate 3, an inclined ejector assembly, a straight ejector assembly and a material head ejector pin 4, and the glue inlet flow channel is set at the bottom of the inclined ejector block 5. When the straight ejector assembly ejects the product upward, it can tear off the connection between the material head 19 and the product at the gate position, thereby realizing automatic cutting off of the material head 19 in the mold, reducing manual participation in trimming the material head 19, shortening the product processing cycle, and reducing the manufacturing cost of the product. Moreover, the structural design is reliable and will not increase the mold volume. After the material head 19 is cut off, the upper ejector plate 2 will drive the lower ejector plate 3 to move upward synchronously, and the material head 19 will be ejected upward and separated from the rear mold 1 by the material head ejector pin 4. At the same time, the lower ejector plate 3 will eject the inclined ejector block 5 upward while making the inclined ejector block 5 slide laterally in a direction perpendicular to the ejection direction, so that the inclined ejector block 5 leaves the top of the material head 19, thereby facilitating the removal of the material head 19. In addition, the utility model is provided with a locking mechanism on one side of the upper ejector plate 2, the lower ejector plate 3 and the bottom plate 12, so as to ensure that the upper ejector plate 2 moves first and the lower ejector plate 3 remains stationary in a certain distance at the beginning of ejection, so as to ensure that the material head 19 can be completely cut off.

[0046] In the above description, many specific details are described to facilitate a full understanding of the present invention. However, the above description is only a preferred embodiment of the present invention. The present invention can be implemented in many other ways different from those described herein, so the present invention is not limited by the specific implementation disclosed above. At the same time, any person familiar with the technical field can make many possible changes and modifications to the technical solution of the present invention by using the methods and technical contents disclosed above without departing from the scope of the technical solution of the present invention, or modify it into an equivalent embodiment of equivalent changes. Any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the scope of protection of the technical solution of the present invention.

Claims

1. An injection mold with automatic cutting off of in-mold material head, comprising a rear mold (1), a front mold and an ejection mechanism, wherein a cavity for molding a product is formed between the rear mold (1) and the front mold, and characterized in that: The ejection mechanism comprises an upper ejector plate (2), a lower ejector plate (3), an inclined ejector assembly, a straight ejector assembly for ejecting products, and a material head ejector (4) for ejecting a material head (19); the inclined ejector assembly comprises an inclined ejector block (5) and an inclined ejector rod (6); the inclined ejector block (5) is mounted on the rear mold (1) and is located on one side of the mold cavity; and a glue inlet channel leading to the mold cavity is distributed on the bottom and side of the inclined ejector block (5); the inclined ejector rod (6) is obliquely slidably inserted into the rear mold (1); and the inclined ejector rod (6) The upper end of the push rod (5) is fixedly connected to the inclined ejector block (5), and the lower end of the push rod (5) is slidably mounted on the lower ejector plate (3); the straight ejector assembly is fixedly connected to the upper ejector plate (2), and the straight ejector assembly is located at the bottom of the cavity; the material head ejector (4) is fixedly connected to the lower ejector plate (3), and the material head ejector (4) is located at the bottom of the glue inlet channel; the upper ejector plate (2) is located at the top of the lower ejector plate (3), and a limiting screw (7) is provided between the upper ejector plate (2) and the lower ejector plate (3).

2. The automatic cutting-off injection mold for the in-mold sprue according to claim 1, characterized in that: A slanted ejector seat (8) is fixedly installed at the bottom of the lower ejector plate (3), and a limiting slide groove (301) is arranged between the slanted ejector seat (8) and the lower ejector plate (3), and the extension direction of the limiting slide groove (301) is perpendicular to the opening and closing direction of the injection mold; a slider (9) is installed at the lower end of the slanted ejector rod (6), and the slider (9) is slidably fitted in the limiting slide groove (301).

3. The automatic cutting-off injection mold for in-mold material head according to claim 1, characterized in that: The straight ejector assembly comprises a straight ejector block (10) and product ejector pins (11) distributed along the mold opening and closing direction; the straight ejector block (10) is mounted on the rear mold (1) and is located at the bottom of the mold cavity; the upper ends of the product ejector pins (11) are fixedly connected to the straight ejector block (10), and the lower ends of the product ejector pins (11) are fixedly connected to the upper ejector pin plate (2).

4. The automatic cutting-off injection mold for in-mold material head according to claim 1, characterized in that: The limit screw (7) passes through the lower ejector plate (3) and is fixed to the bottom of the upper ejector plate (2), and the head of the limit screw (7) is located below the lower ejector plate (3) so as to cooperate with the bottom surface of the lower ejector plate (3) to form a stop limit.

5. The automatic cutting-off injection mold for in-mold material head according to claim 1, characterized in that: It also includes a bottom plate (12), the rear mold (1) is fixed on the bottom plate (12) by a square iron (13), and the upper ejector plate (2) and the lower ejector plate (3) are both movably arranged between the bottom plate (12) and the rear mold (1).

6. The automatic cutting-off injection mold for in-mold material head according to claim 5, characterized in that: A mounting block (14) is fixed on one side of the base plate (12), and a limit hook (15) is rotatably mounted on the mounting block (14); a limit block (16) is fixed on one side of the lower ejector plate (3); when the mold is closed, the limit hook (15) is engaged with the limit block (16); a shifting block (17) is fixed on one side of the upper ejector plate (2); when the upper ejector plate (2) moves upward, the upper ejector plate (2) can drive the shifting block (17) to shift the limit hook (15) to rotate, so that the limit hook (15) is separated from the limit block (16).

7. The automatic cutting-off injection mold for the in-mold sprue according to claim 6, characterized in that: The mounting block (14) is U-shaped, and the lower end of the limit hook (15) is rotatably arranged in the groove of the mounting block (14) through a pin shaft; the limit block (16) is provided with an avoidance groove (1601), the upper end of the limit hook (15) is clamped on the top outer side of the avoidance groove (1601), and the lower end of the shift block (17) extends into the avoidance groove (1601) and is located between the limit block (16) and the limit hook (15).

8. The automatic cutting-off injection mold for the in-mold sprue according to claim 7, characterized in that: The shift block (17) is provided with an inclined surface (1701). When the shift block (17) moves upward following the upper ejector plate (2), the shift block (17) pushes the limit hook (15) to rotate outward via the inclined surface (1701).

9. The injection mold with automatic cutting off of the in-mold sprue according to claim 1, characterized in that: An inclined guide column (18) parallel to the inclined ejector rod (6) is fixed to the bottom of the inclined ejector block (5); an inclined guide hole is provided on the rear mold (1); and the inclined guide column (18) is inserted into the inclined guide hole.

10. The injection mold with automatic cutting off of the in-mold sprue according to claim 1, characterized in that: The upper ejector plate (2) is provided with a long hole (201) for avoiding the inclined ejector rod (6).

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