Nitrogen-assisted forming structure of injection mold

Abstract

The invention discloses a nitrogen-assisted molding structure of an injection mold, and relates to the technical field of injection molding. The nitrogen pipe is inserted into the fixed module, the other end of the nitrogen pipe penetrates through the fixed module and then is connected with external nitrogen, the outer side of the nitrogen pipe is fixedly sleeved with a mounting plate, and the mounting plate is connected with the fixed plate through a supporting plate; one end of the feeding pipe fixedly penetrates through the fixing plate and then is communicated with a feeding port in the fixed mold block, a feeding mechanism is arranged in the feeding pipe, and heating rings are fixedly arranged at the middle end of the feeding pipe in a sleeving mode at equal intervals; the pushing mechanism is arranged on the end wall of one side of the feeding pipe, and the pushing mechanism and the feeding mechanism are arranged in a matched mode; nitrogen is accurately injected into injection molding materials through the nitrogen passing pipe, the feeding mechanism capable of achieving quantitative pushing and the heating system are matched, the defects of sink marks, bubbles and the like in products are effectively eliminated, the surface smoothness and size stability of the products are remarkably improved, meanwhile, the forming period is shortened, and material loss is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of injection molding, and particularly relates to a nitrogen-assisted molding structure for an injection mold. Background Art

[0002] In the traditional injection molding process, when processing plastic products with thick walls or complex structures, defects such as sink marks, bubbles or surface depressions are often generated inside the product due to uneven material shrinkage, seriously affecting the product strength and appearance quality. To solve this problem, the gas-assisted injection molding technology injects inert gases such as nitrogen into the molten plastic to improve material distribution and reduce shrinkage. However, the existing technology still has bottleneck problems such as insufficient gas control accuracy, difficulty in feeding quantification, and low energy consumption efficiency. Improper timing of gas injection and pressure regulation are likely to cause gas penetration or uneven distribution, resulting in inconsistent wall thickness of the product or decreased local strength; the conventional feeding system is difficult to accurately control the amount of material injected into the mold cavity, affecting the molding stability. Summary of the Invention

[0003] The purpose of the present invention is to provide a reasonably designed and convenient-to-use nitrogen-assisted molding structure for an injection mold in view of the defects and deficiencies of the prior art. Nitrogen is accurately injected into the injection material through a nitrogen pipe, and in cooperation with a feeding mechanism and a heating system that can push in a fixed quantity, defects such as sink marks and bubbles inside the product are effectively eliminated, the surface finish and dimensional stability of the product are significantly improved, and at the same time, the molding cycle is shortened and material loss is reduced.

[0004] To achieve the above object, the present invention adopts the following technical solutions: It includes a moving module, a fixed module, a fixing plate, a movable plate, a top plate and a ejector pin. A fixing plate is fixed on one side wall of the fixed module. A moving module is arranged on one side of the fixed module. A movable plate is fixed on the other side of the moving module through a support plate. A top plate is arranged between the movable plate and the moving module. An ejector pin is fixed on the top plate, and the ejector pin is movably inserted into the moving module; It further includes: A nitrogen pipe, the nitrogen pipe is inserted into the fixed module. After the other end of the nitrogen pipe passes through the fixed module, it is connected to external nitrogen. An installation plate is sleeved and fixed on the outer side of the nitrogen pipe, and the installation plate is connected to the fixing plate through a support plate; A feed pipe, one end of the feed pipe is fixedly passed through the fixing plate and is in communication with the feed port on the fixed module. A feeding mechanism is arranged inside the feed pipe. Heating rings are equidistantly sleeved and fixed on the middle section of the feed pipe; A pushing mechanism, the pushing mechanism is arranged on the end wall on one side of the feed pipe, and the pushing mechanism is arranged in cooperation with the feeding mechanism; Through the above technical solutions, feeding is carried out through the feeding mechanism, so that the material moves to the side of the feed pipe located inside the fixed module. Then, the pushing mechanism is started, and the pushing mechanism pushes the material, so that the feeding amount each time is the same. At the same time, external nitrogen is injected into the material through the nitrogen pipe, so that the material is molded.

[0005] As a further improvement of the present invention, a heat preservation pipe is sleeved and fixed on one end of the feed pipe adjacent to the fixed plate, and the heat preservation pipe is sleeved outside the heating ring; Through the above technical solution, the loss of temperature on the heating ring can be reduced, and at the same time, the damage to the heating ring caused by the outside can be reduced.

[0006] As a further improvement of the present invention, connecting guide rods are fixed at the four corners of the movable plate adjacent to one side wall of the movable module, the other ends of the connecting guide rods are movably inserted into the fixed plate, and the mounting plate is movably sleeved on the connecting guide rods; Through the above technical solution, the stability of the movable plate and the movable module during movement can be increased.

[0007] As a further improvement of the present invention, the feeding mechanism includes: A feeding screw rod, which is arranged in the feed pipe, the feeding screw rod is connected with the pushing mechanism, a rotating rod is inserted inside the feeding screw rod, and the other end of the rotating rod is rotatably connected to the end wall of the feed pipe through a bearing; Convex strips, there are several of the convex strips, and they are fixed on the outer ring wall of the rotating rod at equal angles, and the convex strips are movably arranged in the strip-shaped grooves on the inner ring wall of the feeding screw rod; A feed box, which is inserted through and fixed on the upper side of the outer ring wall of the feed pipe, and the feed hopper on the lower side of the feed box is communicated with the feed pipe; A feed motor, which is fixed on one side of the outer ring wall of the feed pipe, and the output shaft of the feed motor is connected with the rotating rod through a synchronous pulley transmission assembly; Through the above technical solution, when the feed motor is started, the feed motor drives the rotating rod to rotate through the synchronous pulley transmission assembly, the rotating rod drives the feeding screw rod to rotate through the convex strips, and the material enters the feed pipe from the feed box, and then the rotating feeding screw rod conveys the material to one side of the fixed module.

[0008] As a further improvement of the present invention, a protective cover is sleeved outside the feed motor, the upper side of the protective cover covers the outside of the synchronous pulley transmission assembly, and the protective cover is fixed on the outer ring wall of the feed pipe; Through the above technical solution, the feed motor and the synchronous pulley transmission assembly can be shielded by the protective cover, which improves the aesthetics and increases the service life of the feed motor at the same time.

[0009] As a further improvement of the present invention, the pushing mechanism includes: A collar, which is sleeved and rotatably connected to the feeding screw rod through a bearing, the outer ring wall of the collar abuts against the inner ring wall of the feed pipe, and a pushing frame is symmetrically fixed on one side of the collar in the up and down direction, the pushing frames are all arranged in an "L" shape, and the vertical rods of the pushing frames are located outside the feed pipe; A push rod, the push rod is arranged between the two push racks, and the push rod is fixedly connected to the vertical rods of the two push racks, and a mounting seat is provided on the outer movable sleeve of the push rod, and the mounting seat is fixed on the end wall of the feed pipe; A return spring, wherein the return spring is fixed to one end of the push rod located inside the mounting seat, and the other end of the return spring is fixed to the end wall of the feed pipe; A push motor, the push motor is embedded and fixed in the mounting seat, a half gear is fixed on the output shaft of the push motor, and the half gear is meshed with the tooth groove on the push rod; Through the above technical solution, the pushing motor is started, the pushing motor drives the half gear to rotate, the half gear drives the pushing rod to move, the pushing rod drives the pushing frame to move, the pushing frame drives the ring to move, the ring drives the feeding screw rod to move, and the ring and the feeding screw rod are screwed together by bearings, so as not to affect the rotation of the feeding screw rod.

[0010] As a further improvement of the present invention, a supporting guide rod is arranged inside the reset spring, one end of the supporting guide rod is fixed on the end wall of the feed pipe, and the other end of the supporting guide rod is movably inserted in the push rod; this can facilitate supporting the reset spring.

[0011] As a further improvement of the present invention, the half gear is composed of a rotating disk and a plurality of teeth, the rotating disk is connected to the output shaft of the driving motor, a plurality of slots are arranged at equal angles on the outer ring wall of the rotating disk, a mounting block is fixed on one side wall of the teeth, the mounting block is inserted in cooperation with the slot, and the mounting block is connected to the rotating disk through a mounting mechanism; Through the above technical solution, according to the amount of material to be pushed, a suitable number of teeth are selected, and then installed on the turntable through the installation mechanism, so that the moving distance of the push rod can be controlled.

[0012] As a further improvement of the present invention, the mounting mechanism comprises: There are two mounting rods, and both are arranged in an "L" shape. The two mounting rods are symmetrically arranged in the turntable. After the vertical rods of the mounting rods pass through the side wall of the turntable, they are exposed on the outside of the turntable. After the horizontal rods of the mounting rods pass through the annular wall of the turntable, they are inserted in cooperation with the grooves on the teeth. Limiting protrusions, there are two of the limiting protrusions, and they are respectively fixed on the opposite back sides of the cross bars of the two mounting rods, and the limiting protrusions are inserted in cooperation with the limiting grooves on the inner wall of the grooves on the teeth; The resisting springs are two in number and are symmetrically arranged in the turntable. One end of the resisting springs is fixed in the turntable, and the other end of the resisting springs is fixedly connected to the vertical rods of the two symmetrical mounting rods; Through the above technical solution, when installing the tooth, press the installation rod simultaneously from above and below. The installation rod squeezes against the spring, and then the tooth is installed on the cross bar of the installation rod. Then, release the installation rod. Under the elastic force of the spring, the installation rod is pushed outward, so that the limiting convex block is inserted into the limiting groove on the inner wall of the groove on the tooth, thus facilitating the installation.

[0013] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. By precisely injecting nitrogen gas through the nitrogen gas pipe built into the fixed module and cooperating with the heating ring to control the temperature, shrinkage marks and bubbles of the product are eliminated, and the molding quality and efficiency are improved; 2. By adopting the screw rod propulsion and the control of the driving motor, precise quantitative feeding of materials is realized, ensuring that the injection volume is consistent each time and reducing the scrap rate; 3. The semi-gear adopts a detachable tooth design, and the number of teeth can be quickly adjusted through the installation mechanism, flexibly controlling the feeding stroke to meet different molding requirements; 4. The connecting guide rod enhances the moving stability of the moving module, the protective cover protects the transmission components, and the reset spring and the supporting guide rod cooperate to ensure the reset accuracy of the pushing mechanism. Description of the Drawings

[0014] Figure 1 It is a schematic structural diagram of the present invention.

[0015] Figure 2 It is an exploded view of the feed pipe, the feeding mechanism and the pushing mechanism in the present invention.

[0016] Figure 3 It is an exploded view of the feeding mechanism in the present invention.

[0017] Figure 4 It is an exploded view of the pushing mechanism in the present invention.

[0018] Figure 5 It is a schematic structural diagram of the push rod, the driving motor and the semi-gear in the present invention.

[0019] Figure 6 It is an exploded view of the semi-gear in the present invention.

[0020] Figure 7 It is Figure 6 the enlarged view of part A in

[0021] Figure 8 It is a cross-sectional view of the installation block in the present invention.

[0022] Description of the Reference Numerals: Moving module 1, fixed module 2, fixed plate 3, movable plate 4, top plate 5, ejector pin 6, nitrogen gas pipe 7, mounting plate 8, feed pipe 9, feeding mechanism 10, feed screw rod 10-1, rotating rod 10-2, convex strip 10-3, feed box 10-4, feed motor 10-5, heating ring 11, pushing mechanism 12, collar 12-1, pushing frame 12-2, pushing rod 12-3, mounting seat 12-4, return spring 12-5, pushing motor 12-6, semi-gear 12-7, turntable 12-7-1, tooth 12-7-2, heat preservation pipe 13, connecting guide rod 14, protective cover 15, supporting guide rod 16, mounting block 17, mounting mechanism 18, mounting rod 18-1, limiting convex block 18-2, abutting spring 18-3. Detailed implementation mode

[0023] The following will combine the accompanying drawings to clearly and completely describe the technical solutions in the present invention. The preferred embodiments described are only examples. All other embodiments obtained by those skilled in the art without creative efforts belong to the scope of protection of the present invention. Embodiment 1

[0024] As Figures 1-8 shown, this embodiment includes a moving module 1, a fixed module 2, a fixed plate 3, a movable plate 4, a top plate 5 and an ejector pin 6. A fixed plate 3 is fixed on one side wall of the fixed module 2 by bolts. A moving module 1 is arranged on the right side of the fixed module 2. A movable plate 4 is fixed on the right side of the moving module 1 by a support plate. Connecting guide rods 14 are welded and fixed at the four corners of the side wall of the movable plate 4 adjacent to the moving module 1. The other ends of the connecting guide rods 14 are movably inserted into the fixed plate 3. A mounting plate 8 is movably sleeved on the connecting guide rods 14, which can increase the stability when the movable plate 4 and the moving module 1 move; A top plate 5 is arranged between the movable plate 4 and the moving module 1. An ejector pin 6 is fixed on the top plate 5. The ejector pin 6 is movably inserted into the moving module 1; It further includes: A nitrogen gas pipe 7, the nitrogen gas pipe 7 is inserted into the fixed module 2. After the other end of the nitrogen gas pipe 7 passes through the fixed module 2, it is connected to external nitrogen gas. A mounting plate 8 is sleeved and fixed on the outer side of the nitrogen gas pipe 7. The mounting plate 8 is connected to the fixed plate 3 through a support plate; A feed pipe 9, one end of the feed pipe 9 is welded and fixed to penetrate through the fixed plate 3 and is communicated with the feed port on the fixed module 2. A feeding mechanism 10 is arranged in the feed pipe 9. Heating rings 11 are equidistantly sleeved and fixed on the middle end of the feed pipe 9; A heat preservation pipe 13 is sleeved and fixed on the end of the feed pipe 9 adjacent to the fixed plate 3. The heat preservation pipe 13 is sleeved on the outer side of the heating ring 11, which can reduce the loss of temperature on the heating ring 11 and at the same time reduce the damage to the heating ring 11 caused by the outside; A pushing mechanism 12, the pushing mechanism 12 is arranged on the end wall on one side of the feed pipe 9, and the pushing mechanism 12 is arranged in cooperation with the feeding mechanism 10. Example 2

[0025] Refer to Figures 1-3 As shown, on the basis of Example 1, the feeding mechanism 10 includes: A feeding screw rod 10-1, the feeding screw rod 10-1 is arranged in the feeding pipe 9, the feeding screw rod 10-1 is connected to the pushing mechanism 12, a rotating rod 10-2 is inserted inside the feeding screw rod 10-1, and the other end of the rotating rod 10-2 is rotatably connected to the end wall of the feeding pipe 9 through a bearing; Ribs 10-3, there are several ribs 10-3, and they are welded and fixed on the outer ring wall of the rotating rod 10-2 at equal angles. The ribs 10-3 are movably arranged in the strip grooves on the inner ring wall of the feeding screw rod 10-1; A feeding box 10-4, the feeding box 10-4 is inserted through and fixed on the upper side of the outer ring wall of the feeding pipe 9, and the feeding hopper on the lower side of the feeding box 10-4 is communicated with the feeding pipe 9; A feeding motor 10-5, the feeding motor 10-5 is fixed on one side of the outer ring wall of the feeding pipe 9 by bolts, and the output shaft of the feeding motor 10-5 is connected to the rotating rod 10-2 through a synchronous pulley transmission component; a protective cover 15 is sleeved outside the feeding motor 10-5, the upper side of the protective cover 15 covers the outside of the synchronous pulley transmission component, and the protective cover 15 is fixed on the outer ring wall of the feeding pipe 9. The feeding motor 10-5 and the synchronous pulley transmission component can be shielded through the protective cover 15, improving the aesthetics while increasing the service life of the feeding motor 10-5. Example 3

[0026] Refer to Figures 1-2 、 Figures 4-5 As shown, on the basis of Example 2, the pushing mechanism 12 includes: A collar 12-1, the collar 12-1 is sleeved and rotatably connected to the feeding screw rod 10-1 through a bearing, the outer ring wall of the collar 12-1 abuts against the inner ring wall of the feeding pipe 9, and two pushing frames 12-2 are symmetrically fixed on the upper and lower sides of the left side of the collar 12-1. The pushing frames 12-2 are both arranged in an "L" shape, and the vertical rods of the pushing frames 12-2 are located outside the feeding pipe 9; A pushing rod 12-3, the pushing rod 12-3 is arranged between the two pushing frames 12-2, and the pushing rod 12-3 is fixedly welded to the vertical rods of the two pushing frames 12-2. An installation seat 12-4 is movably sleeved outside the pushing rod 12-3, and the installation seat 12-4 is fixed on the end wall of the feeding pipe 9; Reset spring 12-5, the reset spring 12-5 is fixed to one end of the push rod 12-3 located inside the mounting seat 12-4, and the other end of the reset spring 12-5 is fixed to the end wall of the feed pipe 9; a support guide rod 16 is arranged inside the reset spring 12-5, one end of the support guide rod 16 is fixed to the end wall of the feed pipe 9, and the other end of the support guide rod 16 is movably inserted into the push rod 12-3; it is convenient to support the reset spring 12-5; Push motor 12-6, the push motor 12-6 is embedded and fixed in the mounting seat 12-4, and a half gear 12-7 is fixed on the output shaft of the push motor 12-6, and the half gear 12-7 is engaged with the tooth groove on the push rod 12-3. Embodiment 4

[0027] See Figures 5-8 As shown, on the basis of Embodiment 3, the half gear 12-7 is composed of a turntable 12-7-1 and several teeth 12-7-2. The turntable is connected to the output shaft of the push motor 12-6. Several slots are equiangularly arranged on the outer ring wall of the turntable 12-7-1. An installation block 17 is welded and fixed on one side wall of the tooth 12-7-2. The installation block 17 is inserted into the slot in cooperation, and the installation block 17 is connected to the turntable through an installation mechanism 18; the installation mechanism 18 includes: Installation rods 18-1, there are two installation rods 18-1, and they are both arranged in an "L" shape. The two installation rods 18-1 are symmetrically arranged up and down in the turntable 12-7-1. After the vertical rod of the installation rod 18-1 passes through the side wall of the turntable 12-7-1, it is exposed outside the turntable 12-7-1. After the horizontal rod of the installation rod 18-1 passes through the ring wall of the turntable 12-7-1, it is inserted into the groove on the tooth 12-7-2 in cooperation; Limit bumps 18-2, there are two limit bumps 18-2, and they are respectively fixed on the opposite surfaces of the horizontal rods of the two installation rods 18-1. The limit bumps 18-2 are inserted into the limit grooves on the inner wall of the groove on the tooth 12-7-2 in cooperation; Resistance springs 18-3, there are two resistance springs 18-3, and they are symmetrically arranged up and down in the turntable 12-7-1. One end of the resistance spring 18-3 is respectively fixed in the turntable 12-7-1, and the other end of the resistance spring 18-3 is fixedly connected to the vertical rods of the two symmetrically arranged up and down installation rods 18-1.

[0028] When using the present invention, start the feed motor 10-5, the feed motor 10-5 drives the rotating rod 10-2 to rotate through the synchronous wheel transmission assembly, the rotating rod 10-2 drives the feeding screw 10-1 to rotate through the convex strip 10-3, and the material enters the oil feed box 10-4 into the feed pipe 9, and then the material is transported to one side of the fixed module 2 through the rotating feeding screw 10-1, and the appropriate number of teeth 12-7-2 is selected according to the required amount of material to be pushed. When installing the teeth 12-7-2, press the installation rod 18-1 up and down at the same time, the installation rod 18-1 squeezes the resistance spring 18-3, and then the teeth 12-7-2 are installed on the cross bar of the installation rod 18-1, and then the installation rod 18-1 is released. Under the elastic force of the resistance spring 18-3, the installation The rod 18-1 is pushed outward so that the limiting protrusion 18-2 is inserted into the limiting groove on the inner wall of the groove on the tooth 12-7-2, which is convenient for installation, so as to control the moving distance of the pushing rod 12-3, and then start the pushing motor 12-6, the pushing motor 12-6 drives the half gear 12-7 to rotate, the half gear 12-7 drives the pushing rod 12-3 to move, the pushing rod 12-3 drives the pushing frame 12-2 to move, the pushing frame 12-2 drives the ring 12-1 to move, the ring 12-1 drives the feeding screw rod 10-1 to move, and the ring 12-1 and the feeding screw rod 10-1 are screwed together by bearings, so as not to affect the rotation of the feeding screw rod 10-1, so that the feeding amount is the same each time, and at the same time, the external nitrogen is injected into the material through the nitrogen pipe 7, so that the material is formed.

[0029] Compared with the prior art, the beneficial effects of this specific implementation are as follows: 1. The nitrogen injection timing and pressure are precisely controlled by the built-in nitrogen pipe 7 of the fixed module 2, and the temperature is precisely controlled by the multi-stage heating ring 11, which effectively eliminates the internal shrinkage marks and bubbles of the product, and significantly improves the molding quality and production efficiency; 2. The unique design of the spiral propulsion rod and the push motor 12-6 is adopted to realize the precise quantitative material delivery through the adjustable half gear 12-7 mechanism, ensuring the high consistency of each injection volume and greatly reducing the scrap rate; 3. The innovatively designed half gear 12-7 adopts modular teeth 12-7-2 that can be quickly disassembled and assembled, and can be flexibly adjusted through the spring limit installation mechanism 18 to meet the diverse requirements of different products for feed stroke and thrust; 4. The four-corner connecting guide rods 14 ensure the smooth movement of the dynamic module 1, the protective cover 15 fully protects the transmission components, and the reset spring 12-5 and the supporting guide rod 16 work together to double guarantee the reset accuracy and long-term reliability of the pushing mechanism 12.

[0030] For those skilled in the art, they can modify the technical solutions described in the foregoing embodiments and perform equivalent replacements of some technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A nitrogen-assisted injection molding structure for an injection mold, which comprises a moving module (1), a fixed module (2), a fixed plate (3), a movable plate (4), a top plate (5) and ejector pins (6). A fixed plate (3) is fixed on one side wall of the fixed module (2). A moving module (1) is arranged on one side of the fixed module (2). A movable plate (4) is fixed on the other side of the moving module (1) through a support plate. A top plate (5) is arranged between the movable plate (4) and the moving module (1). Ejector pins (6) are fixed on the top plate (5), and the ejector pins (6) are movably inserted into the moving module (1). It is characterized in that: It also includes: A nitrogen gas pipe (7), the nitrogen gas pipe (7) is inserted into the fixed module (2), after the other end of the nitrogen gas pipe (7) passes through the fixed module (2), it is connected to external nitrogen gas, an installation plate (8) is sleeved and fixed on the outer side of the nitrogen gas pipe (7), and the installation plate (8) is connected to the fixed plate (3) through a support plate; A feed pipe (9), one end of the feed pipe (9) is fixedly passed through the fixed plate (3) and is communicated with the feed port on the fixed module (2), a feeding mechanism (10) is arranged in the feed pipe (9), and heating rings (11) are sleeved and fixed at equal intervals on the middle part of the feed pipe (9); A pushing mechanism (12), the pushing mechanism (12) is arranged on the end wall on one side of the feed pipe (9), and the pushing mechanism (12) is arranged in cooperation with the feeding mechanism (10).

2. The nitrogen-assisted injection molding structure of an injection mold according to claim 1, characterized in that: A heat preservation pipe (13) is sleeved and fixed on one end of the feed pipe (9) adjacent to the fixed plate (3), and the heat preservation pipe (13) is sleeved on the outer side of the heating ring (11).

3. The nitrogen-assisted injection molding structure of an injection mold according to claim 1, characterized in that: Connection guide rods (14) are fixed at the four corners of the side wall of the movable plate (4) adjacent to the movable module (1), the other ends of the connection guide rods (14) are movably inserted into the fixed plate (3), and the installation plate (8) is movably sleeved on the connection guide rods (14).

4. The nitrogen-assisted injection molding structure of an injection mold according to claim 1, characterized in that: The feeding mechanism (10) includes: A feeding screw rod (10-1), the feeding screw rod (10-1) is arranged in the feed pipe (9), the feeding screw rod (10-1) is connected with the pushing mechanism (12), a rotating rod (10-2) is inserted into the feeding screw rod (10-1), and the other end of the rotating rod (10-2) is rotationally connected to the end wall of the feed pipe (9) through a bearing; Convex strips (10-3), there are several convex strips (10-3), and they are fixedly arranged at equal angles on the outer ring wall of the rotating rod (10-2), and the convex strips (10-3) are movably arranged in the strip grooves on the inner ring wall of the feeding screw rod (10-1); A feed box (10-4), the feed box (10-4) is inserted and fixed through the upper side of the outer ring wall of the feed pipe (9), and the feed hopper on the lower side of the feed box (10-4) is communicated with the feed pipe (9); A feed motor (10-5), the feed motor (10-5) is fixed on one side of the outer ring wall of the feed pipe (9), and the output shaft of the feed motor (10-5) is connected with the rotating rod (10-2) through a synchronous pulley transmission assembly.

5. The nitrogen-assisted injection molding structure of an injection mold according to claim 4, characterized in that: A protective cover (15) is sleeved on the outer side of the feed motor (10-5), the upper side of the protective cover (15) covers the outer side of the synchronous pulley transmission assembly, and the protective cover (15) is fixed on the outer ring wall of the feed pipe (9).

6. The nitrogen-assisted injection molding structure of an injection mold according to claim 4, characterized in that: The pushing mechanism (12) includes: A collar (12-1), the collar (12-1) is sleeved and rotationally connected to the feeding screw rod (10-1) through a bearing, the outer ring wall of the collar (12-1) abuts against the inner ring wall of the feed pipe (9), and a pushing frame (12-2) is symmetrically fixed on one side of the collar (12-1) up and down, the pushing frames (12-2) are both arranged in an "L" shape, and the vertical rods of the pushing frames (12-2) are located on the outer side of the feed pipe (9); A push rod (12-3), the push rod (12-3) being arranged between the two push racks (12-2), and the push rod (12-3) being fixedly connected to the vertical rods of the two push racks (12-2), and an outer movable sleeve of the push rod (12-3) being provided with a mounting seat (12-4), and the mounting seat (12-4) being fixed on the end wall of the feed pipe (9); A return spring (12-5), wherein the return spring (12-5) is fixed to one end of the push rod (12-3) located inside the mounting seat (12-4), and the other end of the return spring (12-5) is fixed to the end wall of the feed pipe (9); A pushing motor (12-6) is embedded in and fixed in a mounting seat (12-4); a half gear (12-7) is fixed on an output shaft of the pushing motor (12-6); the half gear (12-7) is meshed with a tooth groove on the pushing rod (12-3).

7. An injection mold nitrogen-assisted forming structure according to claim 6, characterized in that: A support guide rod (16) is arranged inside the return spring (12-5), one end of the support guide rod (16) is fixed to the end wall of the feed pipe (9), and the other end of the support guide rod (16) is movably inserted into the push rod (12-3).

8. An injection mold nitrogen-assisted forming structure according to claim 6, characterized in that: The half gear (12-7) is composed of a rotating disk (12-7-1) and a plurality of teeth (12-7-2). The rotating disk is connected to the output shaft of the driving motor (12-6). A plurality of slots are arranged at equal angles on the outer ring wall of the rotating disk (12-7-1). A mounting block (17) is fixed on one side wall of the teeth (12-7-2). The mounting block (17) is inserted in cooperation with the slots. The mounting block (17) is connected to the rotating disk via a mounting mechanism (18).

9. An injection mold nitrogen-assisted forming structure according to claim 8, characterized in that: The mounting mechanism (18) comprises: There are two mounting rods (18-1), and both mounting rods (18-1) are arranged in an "L" shape. The two mounting rods (18-1) are symmetrically arranged in the rotating disk (12-7-1) in an upper and lower manner. After the vertical rods of the mounting rods (18-1) pass through the side wall of the rotating disk (12-7-1), they are exposed on the outside of the rotating disk (12-7-1). After the horizontal rods of the mounting rods (18-1) pass through the annular wall of the rotating disk (12-7-1), they are inserted in cooperation with the grooves on the teeth (12-7-2); Limiting protrusions (18-2), there are two limiting protrusions (18-2), which are respectively fixed on the opposite back sides of the cross bars of the two mounting rods (18-1), and the limiting protrusions (18-2) are matched and inserted in the limiting grooves on the inner wall of the grooves on the teeth (12-7-2); There are two resistance springs (18-3), which are symmetrically arranged in the rotating disk (12-7-1) in an upper and lower direction, one end of the resistance spring (18-3) is respectively fixed in the rotating disk (12-7-1), and the other end of the resistance spring (18-3) is fixedly connected to the vertical rods of the two symmetrical mounting rods (18-1) in an upper and lower direction.

Images