Injection mold with automatic breaking head

Abstract

The present invention relates to an injection mold capable of automatically breaking off a slug, comprising a female mold component, a male mold component, an ejector plate group and a slug breaking component, wherein the male mold component comprises a male mold plate, a mold foot and a lower fixed plate arranged in sequence, and the slug breaking component comprises an inclined support pin, a slider seat, a stripping plate, a slider and a slider pressing plate, wherein the inclined support pin is fixedly installed in the female mold component, and a point gate is provided on the slider, and the slider pressing plate is fixedly installed in the male mold plate, and the slider seat, the stripping plate and the slider are slidably installed in the slider pressing plate, and when stripping, the inclined support pin acts on the slider seat, and the slider seat slides synchronously with the stripping plate along the slider pressing plate, and breaks off the point gate slug on the slider, and then the slider seat slides synchronously with the slider, so that the slider is separated from the product, and the slider seat is separated from the stripping plate. The present invention is suitable for a mold with a slider feeding glue, and can automatically break off a point gate slug.

Description

Technical Field

[0001] The invention relates to an injection mold, in particular to an injection mold capable of automatically pulling off a material head. Background Art

[0002] In the production of plastic products, the initial molding of plastic products is usually completed by injection molding. During demoulding, the product and the material head are ejected at the same time, and manual shearing is required later, which easily leaves shear marks on the product, cannot meet the high requirements of some products for surface quality, and has low production efficiency. Summary of the invention

[0003] In order to overcome the above-mentioned defects, the present invention provides an injection mold for automatically breaking off the slug, wherein a slug breaking component is provided in the mold. During demoulding, the mold is demoulded three times through the slug breaking component, thereby completely breaking off the point gate slug on the slider, thereby completing the operation of automatically breaking off the slug.

[0004] The technical solution adopted by the present invention to solve its technical problem is:

[0005] An injection mold for automatically breaking off a slug, comprising a female mold component, a male mold component, an ejector plate group and a slug breaking component, wherein the male mold component comprises a male mold plate, a mold foot and a lower fixed plate arranged in sequence, the female mold component can be detachably covered on the male mold plate, the ejector plate group is movably arranged between the male mold plate and the lower fixed plate, the slug breaking component comprises an inclined support pin, a slider seat, a stripping plate, a slider and a slider pressure plate, the inclined support pin is fixedly installed in the female mold component, and a point gate is arranged on the slider. When the material is removed, a point gate material head is formed at the point gate, the slider pressure plate is fixedly installed in the male template, and the slider seat, stripping plate and slider are sequentially and slidably installed in the slider pressure plate. When stripping, the diagonal support pin acts on the slider seat, and the slider seat slides along the slide pressure plate synchronously with the stripping plate, and the point gate material head on the slider is pulled off, and the diagonal support pin further acts on the slider seat, and the slider seat slides synchronously with the slider, so that the slider is separated from the product, and finally the slider seat is separated from the stripping plate to automatically cut off the point gate material head.

[0006] Preferably, the ejector plate group includes an upper ejector plate and a lower ejector plate that are fixedly connected, the female mold assembly includes an upper fixed plate, a stripping plate and a female mold plate that are fixedly connected, the upper end of the mold foot is fixedly connected to the male mold plate, and the lower end thereof is fixedly connected to the lower fixed plate, the ejector plate group is installed between the two mold feet, a female mold core is provided in the female mold plate, and a male mold core is provided in the male mold plate.

[0007] Preferably, the diagonal support pin is fixed to the stripping plate, and the lower end of the diagonal support pin obliquely passes through the mother template. When the mold is closed, the lower end of the diagonal support pin is obliquely inserted into the slider seat.

[0008] Preferably, two parallel slider pressure plates are provided in the male template, and parallel long strip slide grooves are provided on the opposite surfaces of the two slider pressure plates. The slider seat, the stripping plate and the two ends of the slider are respectively slidably installed in the slide grooves of the pressure plates, and the stripping plate limit block is fixedly installed on the slider pressure plate, and the stripping plate limit block protrudes from the slider pressure plate.

[0009] Preferably, the material head breaking assembly also includes a grabbing pin, an opener and a slider pull plate. The slider seat is connected to the stripping plate via an opener, and the slide plate is installed in the male mold core via the opener. The grabbing pin is fixed to the slider seat and passes through the stripping plate to contact the point gate material head. One end of the slider pull plate is fixed to the slider seat, and the other end can drive the slider to slide.

[0010] Preferably, the slider seat is provided with an oblique slot, a first mounting slot and a second mounting slot, the oblique slot is for the oblique support pin to be inserted, the first mounting slot is installed in the material grabbing pin, the second mounting slot is installed in the opener and closer, the lower ends of both sides of the slider seat extend outward to form a first protrusion, and the first protrusion is slidably arranged in the sliding slot of the slide block, and a notch is provided on both sides of the slider seat.

[0011] Preferably, the oblique slot is opened along the height direction of the slider seat, the first mounting slot and the second mounting slot are opened along the width direction of the slider seat, the notch is opened along the width direction of the slider seat, and a screw plug is installed between the grabbing pin and the first mounting slot to fix the grabbing pin on the slider seat.

[0012] Preferably, the stripping plate is provided with a third mounting groove, a fourth mounting groove, a stop block and a second protrusion, the grabbing pin passes through the third mounting groove, the opener and closer is installed in the fourth mounting groove to connect the stripping plate and the slider seat, the two sides of the stripping plate extend outwards to form a stop block, which is used to resist the stripping plate limit block of the slide block, and the lower ends of the two sides of the stripping plate extend outwards to form a second protrusion, which is slidably arranged in the slide groove of the slide block.

[0013] Preferably, a fifth mounting groove is provided on the slider, the shutter is installed in the fifth mounting groove to connect the slider to the male mold core, and the lower ends of both sides of the slider extend outward to form a third protrusion, which is slidably arranged in the sliding groove of the slide block.

[0014] Preferably, a slider pull plate is horizontally installed on both sides of the slider seat, and the slider pull plate is passed through the stripping plate and the slider. The two ends of the slider pull plate are a mounting part and a stop part respectively. The mounting part is fixed on the slider seat, and the stop part is used to drive the slider to slide along with the slider seat.

[0015] The beneficial effects of the present invention are as follows: the present invention is provided with a material head breaking assembly, which includes an inclined support pin, a slider seat, a stripping plate, a slider, a slider pressure plate and a slider pull plate. When stripping, first, the inclined support pin moves upward under the drive of the mother mold assembly, and gives the slider seat a force to the left, and the slider seat moves backward with the stripping plate, and pulls the point-casting material head out of the slider. Secondly, after the slider seat moves a certain distance, the slider pull plate drives the slider to move synchronously with the slider seat, and the slider is pulled out of the side of the product and buckled. Finally, the slider seat continues to retreat, and the stripping plate is stopped by the stripping plate limit block on the slider pressure plate. The stripping plate is separated from the slider seat, and the point-casting material head is broken, completing the cutting operation of the point-casting material head. The present invention is suitable for a mold with a slider for glue feeding, and can automatically break the point-casting material head. The entire stripping process is completed in three steps to achieve the effect of glue feeding of an ordinary three-plate mold. Therefore, the present invention does not need to manually cut off the point-casting material head from the product, which not only improves production efficiency, but also improves product quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the present invention;

[0017] Figure 2 It is an assembly diagram of the material head breaking component in the present invention;

[0018] Figure 3 It is a cross-sectional view of the material head breaking assembly in the present invention;

[0019] Figure 4 It is an exploded view of the material head breaking assembly in the present invention;

[0020] Figure 5 It is a structural schematic diagram of the slider seat in the present invention;

[0021] Figure 6 It is a structural schematic diagram of the stripping plate in the present invention;

[0022] Figure 7 It is a structural schematic diagram of the slider in the present invention;

[0023] Figure 8 This is a diagram of the complete mold closing state of the sprue breaking assembly in the present invention;

[0024] Fig. 9 This is a PL1 mold opening state diagram of the stub break assembly in the present invention;

[0025] Fig.10 This is a PL2 mold opening state diagram of the stub break assembly in the present invention;

[0026] Fig.11 This is a PL3 mold opening state diagram of the stub break assembly in the present invention;

[0027] In the figure: 10-female mold assembly, 11-upper fixed plate, 12-peeling plate, 13-female mold plate, 14-female mold core, 20-male mold assembly, 21-male mold plate, 22-male mold core, 23-mold foot, 24-lower fixed plate, 25-upper ejector plate, 26-lower ejector plate, 30-head pull-off assembly, 31-oblique support pin, 32-mounting screw, 33-grabbing pin, 34-opener, 35-screw plug, 40-slider seat, 41-oblique slot, 42 -First mounting groove, 43-second mounting groove, 44-first protrusion, 45-notch, 50-stripping plate, 51-third mounting groove, 52-fourth mounting groove, 53-stopper, 54-second protrusion, 60-slider, 61-point gate, 62-fifth mounting groove, 63-third protrusion, 64-point gate head, 70-slider pressure plate, 71-stripping plate limit block, 72-slide groove, 80-slider pull plate, 81-installation part, 82-stopper. DETAILED DESCRIPTION

[0028] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0029] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein, for example. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0030] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0031] Example: Figure 1-11 As shown, an injection mold for automatically breaking off a slug comprises a female mold component 10, a male mold component 20, an ejector plate group and a slug breaking component 30, wherein the male mold component 20 comprises a male mold plate 21, a mold foot 23 and a lower fixed plate 24 arranged in sequence, the female mold component 10 can be detachably covered on the male mold plate 21, the ejector plate group is movably arranged between the male mold plate 21 and the lower fixed plate 24, the slug breaking component 30 comprises an inclined support pin 31, a slider seat 40, a stripping plate 50, a slider 60 and a slider pressing plate 70, the inclined support pin 31 is fixedly installed in the female mold component 10, and a point gate 61 is provided on the slider 60 During injection molding, a point gate material head 64 is formed at the point gate 61, and the slider pressure plate 70 is fixedly installed in the male mold plate 21, and the slider seat 40, the stripping plate 50 and the slider 60 are sequentially and slidably installed in the slider pressure plate 70. During stripping, the diagonal support pin 31 acts on the slider seat 40, and the slider seat slides synchronously along the slide plate pressure plate with the stripping plate 50, and the point gate material head 64 on the slider 60 is pulled off, and the diagonal support pin 31 further acts on the slider seat 40, and the slider seat slides synchronously with the slider 60, so that the slider is separated from the product, and finally the slider seat 40 is separated from the stripping plate 50 and the point gate material head 64 is automatically cut off.

[0032] In the present invention, a point gate 61 is provided on the slider 60. When the mold is closed, the female mold plate and the male mold plate are completely fitted together, the diagonal support pin 31 is inserted into the slider seat 40, and the slider seat 40, the stripping plate 50 and the slider 60 are sequentially fitted together from left to right. The product is injection molded, and a point gate material head 64 is formed between the point gate 61 of the slider and the stripping plate 50. When stripping, the diagonal support pin 31 moves upward under the drive of the female mold assembly, and gives the slider seat 40 a leftward force, and the slider seat moves backward synchronously with the stripping plate 50. Figure 5PL1 in the first opening, that is, the stripping plate is separated from the slider first, and the point gate head 64 is pulled out of the slider (such as Fig. 9 As shown), after the slider seat runs a certain distance, it drives the slider to run synchronously, PL2 opens, and the slider comes out of the side buckle of the product (as shown Fig.10 As shown), the slider seat continues to retreat, the stripping plate 50 is stopped by the slider pressure plate 70, and PL3 is opened, that is, the stripping plate 50 is separated from the slider seat 40, and the point gate head 64 is pulled off (as shown). Fig.11 The present invention is suitable for a mold with a slider for glue injection, and can automatically pull off a point gate head, thereby achieving the glue injection effect of an ordinary three-plate mold.

[0033] like Figure 1 As shown, the ejector plate group includes an upper ejector plate 25 and a lower ejector plate 26 that are fixedly connected, the female mold assembly 10 includes an upper fixed plate 11, a stripping plate 12 and a female mold plate 13 that are fixedly connected, the upper end of the mold foot 23 is fixedly connected to the male mold plate 21, and the lower end thereof is fixedly connected to the lower fixed plate 24, the ejector plate group is installed between the two mold feet 23, the female mold plate 13 is provided with a female mold core 14, and the male mold plate 21 is provided with a male mold core 22. The injection mold is arranged from top to bottom in sequence with an upper fixed plate 11, a stripping plate 12, a female mold plate 13, a male mold plate 21, a mold foot 23 and a lower fixed plate 24, the ejector plate group is movably installed between the male mold plate and the lower fixed plate, the mold foot 23 is located on both sides of the ejector plate group, when the mold is closed, a cavity for product molding is formed between the female mold core 14 and the male mold core 22, and the high-temperature molten material enters the cavity from the point gate 61 of the slider to form the product.

[0034] like Figure 1 As shown, the diagonal support pin 31 is fixed to the stripping plate 12, and the lower end of the diagonal support pin 31 obliquely passes through the mother mold plate 13. When the mold is closed, the lower end of the diagonal support pin 31 obliquely inserts into the slider seat 40. The diagonal support pin 31 is obliquely arranged in the mother mold assembly. When the mold is closed, the diagonal support pin is inserted into the slider seat 40 so that the slider seat moves to the right, driving the stripping plate and the slider to reset; when demolding, the diagonal support pin moves upward, causing the slider seat to move to the left, driving the stripping plate and the slider to gradually separate, thereby completely pulling off the point gate head 64.

[0035] like Figure 2As shown, two parallel slider pressure plates 70 are provided in the male mold plate 21, and parallel long strip-shaped slide grooves 72 are provided on the opposite surfaces of the two slider pressure plates 70. The slider seat 40, the stripping plate 50 and the two ends of the slider 60 are respectively slidably mounted on the slide grooves 72 of the pressure plates, and the stripping plate limit block 71 is fixedly mounted on the slider pressure plate 70, and the stripping plate limit block 71 protrudes from the slider pressure plate 70. The slider pressure plate 70 is fixed in the male mold plate 21 by means of mounting screws 32, and the stripping plate limit block 71 is fixed to the upper surface of the slider pressure plate by means of mounting screws 32, and the stripping plate limit block 71 protrudes beyond the width of the slider pressure plate, that is, the stripping plate limit block 71 protrudes toward the inner side of the slider pressure plate; Figure 2 The S1 stroke is the distance between the slider seat and the stripping plate before the slider 60 runs when the mold is opened. The S1 stroke is greater than the length of the point gate head 64 in the slider 60 plus the depth of the inverted pulling well, so as to ensure that the point gate head is pulled out before PL2 is opened; the S2 stroke is the entire running distance of the stripping plate. The S2 stroke is greater than the S1 stroke and can be adjusted according to the actual situation of the slider stroke, so as to ensure that PL2 is opened first and then PL3.

[0036] like Figure 2-4 As shown, the material head breaking assembly 30 also includes a grabbing pin 33, an opener and a shutter 34 and a slider pull plate 80. The slider seat 40 and the stripping plate 50 are connected via the opener and shutter 34. The slide plate 60 is installed in the male mold core 22 via the opener and shutter 34. The grabbing pin 33 is fixed to the slider seat 40 and passes through the stripping plate 50 to contact the point gate material head 64. One end of the slider pull plate 80 is fixed to the slider seat 40, and the other end can drive the slider 60 to slide. The slider seat is connected to the stripping plate, and the slide plate is connected to the male mold core through the shutter 34. When the external force is greater than the binding force of the shutter, the slider seat is separated from the stripping plate, and the slide plate leaves the male mold core. The grabbing pin 33 is horizontally penetrated through the slider seat and the stripping plate and extends out of the stripping plate. The point gate head is formed at the end of the grabbing pin 33. Therefore, when PL1 is opened, the grabbing pin 33 ensures that the point gate head is pulled apart from the product; when the stripping plate 50 is stationary and the slider seat slides to the left, the point gate head is separated from the grabbing pin under the action of the stripping plate, and finally the point gate head can be taken out.

[0037] like Figure 5As shown, the slider seat 40 is provided with an oblique insertion slot 41, a first mounting slot 42 and a second mounting slot 43, the oblique insertion slot 41 is for the oblique support pin 31 to be inserted, the first mounting slot 42 is for mounting the material grabbing pin 33, the second mounting slot 43 is for mounting the shutter 34, the lower ends of both sides of the slider seat 40 extend outwards to form a first protrusion 44, the first protrusion 44 is slidably disposed in the slide slot 72 of the slide block, and a notch 45 is provided on both sides of the slider seat 40. When the slider seat 40 slides to the stripping plate limit block 71 of the slide block, the stripping plate limit block 71 can smoothly pass through the notch 45 on the slider seat, so that the slider seat can continue to slide to the left.

[0038] The oblique slot 41 is opened along the height direction of the slider seat 40, the first installation slot 42 and the second installation slot 43 are opened along the width direction of the slider seat 40, and the notch 45 is opened along the width direction of the slider seat. A screw plug 35 is installed between the grabbing pin 33 and the first installation slot 42 to fix the grabbing pin on the slider seat 40. The vertical cross section of the slider seat 40 along its width direction is a trapezoidal structure, and two oblique slots 41 are arranged on its top surface. The oblique slots 41 run through the entire height direction of the slider seat and are arranged obliquely to facilitate the insertion of the diagonal support pin 31 into the oblique slots 41 to give the slider seat a driving force in the horizontal direction. Four first installation slots 42 and four second installation slots 43 are arranged on the inclined surface of the slider seat 40, and both the first installation slots and the second installation slots run through the entire width direction of the slider seat.

[0039] like Figure 6 As shown, the stripping plate 50 is provided with a third mounting groove 51, a fourth mounting groove 52, a stopper 53 and a second protrusion 54, the grabbing pin 33 passes through the third mounting groove 51, the shutter 34 is installed in the fourth mounting groove 52 to connect the stripping plate 50 and the slider seat 40, and the two sides of the stripping plate 50 extend outward to form a stopper 53, which is used to resist the stripping plate limit block 71 of the slide block, and the lower ends of the two sides of the stripping plate extend outward to form a second protrusion 54, which is slidably arranged in the slide groove 72 of the slide block.

[0040] like Figure 7 As shown, the slider 60 is provided with a fifth mounting groove 62, the shutter 34 is installed in the fifth mounting groove 62 to connect the slider 60 to the male mold core 22, and the lower ends of both sides of the slider 60 extend outward to form third protrusions 63, which are slidably arranged in the slide groove 72 of the slider pressing block. The slider seat 40, the stripping plate 50 and the slider 60 are slidably inserted in the slide grooves 72 of the slider pressing plates on both sides through the first protrusion 44, the second protrusion 54 and the third protrusion 63, respectively.

[0041] like Figure 1-2As shown, a slider plate 80 is horizontally installed on both sides of the slider seat 40, and the slider plate 80 is inserted through the stripping plate 50 and the slider 60. The two ends of the slider plate 80 are respectively a mounting portion 81 and a stopper 82. The mounting portion 81 is fixed on the slider seat 40, and the stopper 82 is used to drive the slider 60 to slide along with the slider seat 40. The mounting portion 81 is fixed on the slider seat 40 by mounting screws 32. The slider plate 80 is in an "I" shape as a whole, so the width of the mounting portion and the stopper 82 of the slider plate is greater than the width of the main body. When the mold is closed, the stopper 82 extends out of the slider 60. When the stopper 82 of the slider plate 80 is pulled to the slider 60, the slider seat continues to pull the slider plate, and the stopper 82 of the slider plate will run synchronously with the slider.

[0042] The operation process of the present invention: the steps are as follows:

[0043] Step 1: If Figure 8 As shown, the mold is in a fully closed state, the female mold plate 13 is fully fitted with the male mold plate 21, and the diagonal support pin 31 is fully inserted into the diagonal slot 41 of the slider seat;

[0044] Step 2: When stripping, the diagonal support pin 31 moves upward under the drive of the mother mold assembly, and exerts a force to the left on the slider seat 40. Under the action of the shutter 43, the slider seat moves backward with the stripping plate 50. At this time, the slide plate 60 does not move under the action of the shutter 43. PL1 opens first, that is, the stripping plate is separated from the slider first, and the point gate head 64 is pulled out of the slider at the same time. Fig. 9 The status shown;

[0045] Step 3: Further, the diagonal support pin 31 continues to move upward, and the slider seat 40 moves a certain distance ( Figure 2 After the S1 stroke in the middle), the slider pull plate 80 abuts against the slider 60 and drives the slider to run synchronously, PL2 opens, that is, the slider is out of the product side buckle, and is in Fig.10 The status shown;

[0046] Step 4: Finally, the slider seat 40 continues to retreat, and the stripping plate 50 is stopped by the stripping plate limit block 71 of the slider pressure plate 70. The stripping plate 50 has slid Figure 2 After the S2 stroke in the middle, PL3 is opened, that is, the stripping plate 50 is separated from the slider seat 40, and the point gate head 64 is pulled off from the grabbing pin 33, and is in a state as shown in FIG. Fig.11 In the state shown, just remove the gate head.

[0047] It should be noted that, for those skilled in the art, several modifications and improvements can be made without departing from the concept of the present invention, and these modifications and improvements all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. An injection mold for automatically breaking off the material head, characterized in that: The invention comprises a female mold component (10), a male mold component (20), an ejector plate group and a slug breaking component (30), wherein the male mold component (20) comprises a male mold plate (21), a mold foot (23) and a lower fixed plate (24) arranged in sequence, the female mold component (10) can be detachably covered on the male mold plate (21), the ejector plate group is movably arranged between the male mold plate (21) and the lower fixed plate (24), the slug breaking component (30) comprises a diagonal support pin (31), a slider seat (40), a stripping plate (50), a slider (60) and a slider pressing plate (70), the diagonal support pin (31) is fixedly installed in the female mold component (10), the slider (60) is provided with a point gate (61), and during injection molding, A point gate material head (64) is formed at the point gate (61), the slider pressure plate (70) is fixedly installed in the male mold plate (21), the slider seat (40), the stripping plate (50) and the slider (60) are sequentially and slidably installed in the slider pressure plate (70), when stripping, the diagonal support pin (31) acts on the slider seat (40), the slider seat and the stripping plate (50) slide synchronously along the slider pressure plate, and the point gate material head (64) on the slider (60) is pulled off, the diagonal support pin (31) further acts on the slider seat (40), the slider seat and the slider (60) slide synchronously, so that the slider is separated from the product, and finally the slider seat (40) is separated from the stripping plate (50) and the point gate material head (64) is automatically cut off; The ejector plate group comprises an upper ejector plate (25) and a lower ejector plate (26) which are fixedly connected, the female mold assembly (10) comprises an upper fixed plate (11), a stripping plate (12) and a female mold plate (13) which are fixedly connected, the upper end of the mold foot (23) is fixedly connected to the male mold plate (21), and the lower end thereof is fixedly connected to the lower fixed plate (24), the ejector plate group is installed between the two mold feet (23), a female mold core (14) is arranged in the female mold plate (13), and a male mold core (22) is arranged in the male mold plate (21); when the mold is closed, a mold cavity for molding a product is formed between the female mold core (14) and the male mold core (22), and a high-temperature molten material enters the mold cavity from a point gate (61) of the slider to mold a product; Two parallel slider pressure plates (70) are arranged in the male mold plate (21), and parallel long strip sliding grooves (72) are arranged on the opposite surfaces of the two slider pressure plates (70). The slider seat (40), the stripping plate (50) and the two ends of the slider (60) are respectively slidably mounted on the sliding grooves (72) of the slider pressure plates. The stripping plate limiting block (71) is fixedly mounted on the slider pressure plate (70), and the stripping plate limiting block (71) protrudes from the slider pressure plate (70); The material head breaking assembly (30) further comprises a material grabbing pin (33), an opener (34) and a slider pull plate (80); the slider seat (40) and the stripping plate (50) are connected via the opener (34); the slider (60) is installed in the male mold core (22) via the opener (34); the material grabbing pin (33) is fixed to the slider seat (40) and passes through the stripping plate (50) to contact the point-casting material head (64); one end of the slider pull plate (80) is fixed to the slider seat (40), and the other end can drive the slider (60) to slide; The stroke S1 is the distance that the slider seat (40) and the stripping plate (50) run before the slider (60) runs when the mold is opened, and the stroke S2 ​​is the distance that the stripping plate (50) runs throughout. The stroke S2 ​​is greater than the stroke S1. When the external force is greater than the binding force of the shutter (34), the slider seat (40) and the stripping plate (50) separate, and the slider leaves the male mold core (22); When stripping, the diagonal support pin (31) moves upward under the drive of the mother mold assembly, and exerts a force to the left on the slider seat (40). Under the action of the shutter (34), the slider seat moves backward with the stripping plate (50). At this time, the slider (60) does not move under the action of the shutter (34). The stripping plate is first separated from the slider, and the point gate material head (64) is pulled out of the slider. Further, the diagonal support pin (31) continues to move upward, and after the slider seat (40) moves a certain distance, The slider pull plate (80) abuts against the slider (60) and drives the slider to run synchronously, and the slider is disengaged from the side of the product and buckled; finally, the slider seat (40) continues to retreat, and the stripping plate (50) is stopped by the stripping plate limit block (71) of the slider pressure plate (70). After the stripping plate (50) has slid for the S2 stroke, the stripping plate (50) is separated from the slider seat (40), and the point gate head (64) is pulled off from the grabbing pin (33), and the point gate head (64) can be removed.

2. The injection mold for automatically breaking off the material head according to claim 1, characterized in that: The diagonal support pin (31) is fixed to the stripping plate (12), and the lower end of the diagonal support pin (31) obliquely passes through the mother template (13). When the mold is closed, the lower end of the diagonal support pin (31) is obliquely inserted into the slider seat (40).

3. The injection mold for automatically breaking off the material head according to claim 1, characterized in that: The slider seat (40) is provided with an oblique slot (41), a first mounting slot (42) and a second mounting slot (43); the oblique slot (41) is for the oblique support pin (31) to be inserted; the first mounting slot (42) is for mounting the material grabbing pin (33); the second mounting slot (43) is for mounting the shutter (34); the lower ends of both sides of the slider seat (40) extend outwards to form a first protrusion (44); the first protrusion (44) is slidably disposed in the slide slot (72) of the slider pressure plate; and a notch (45) is provided on both sides of the slider seat (40).

4. The injection mold for automatically breaking off the material head according to claim 3, characterized in that: The oblique slot (41) is opened along the height direction of the slider seat (40), the first mounting slot (42) and the second mounting slot (43) are opened along the width direction of the slider seat (40), the notch (45) is opened along the width direction of the slider seat, and a screw plug (35) is installed between the grabbing pin (33) and the first mounting slot (42) to fix the grabbing pin on the slider seat (40).

5. The injection mold for automatically breaking off the material head according to claim 3, characterized in that: The stripping plate (50) is provided with a third mounting groove (51), a fourth mounting groove (52), a stopper (53) and a second protrusion (54); the grabbing pin (33) passes through the third mounting groove (51); the shutter (34) is installed in the fourth mounting groove (52) to connect the stripping plate (50) and the slider seat (40); the two sides of the stripping plate (50) extend outward to form a stopper (53); the stopper (53) is used to resist the stripping plate limit block (71) of the slider pressure plate; the lower ends of the two sides of the stripping plate extend outward to form a second protrusion (54); the second protrusion (54) is slidably arranged in the slide groove (72) of the slider pressure plate.

6. The injection mold for automatically breaking off the material head according to claim 3, characterized in that: The slider (60) is provided with a fifth mounting groove (62), the shutter (34) is installed in the fifth mounting groove (62) to connect the slider (60) to the male mold core (22), and the lower ends of both sides of the slider (60) extend outward to form a third protrusion (63), and the third protrusion (63) is slidably arranged in the sliding groove (72) of the slider pressure plate.

7. The injection mold for automatically breaking off the material head according to claim 3, characterized in that: A slider pull plate (80) is horizontally installed on both sides of the slider seat (40), and the slider pull plate (80) is inserted through the stripping plate (50) and the slider (60). The two ends of the slider pull plate (80) are a mounting portion (81) and a stop portion (82), respectively. The mounting portion (81) is fixed on the slider seat (40), and the stop portion (82) is used to drive the slider (60) to slide along with the slider seat (40).

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