Gas injection piston mechanism and PIN positioning injection molding device comprising same

Abstract

The invention relates to the technical field of injection molds, and particularly discloses a gas injection piston mechanism and a PIN needle positioning injection molding device comprising the same, the gas injection piston mechanism comprises a template assembly and a mold core assembly, the template assembly comprises two oppositely arranged templates, the mold core assembly comprises two oppositely arranged mold cores, the two mold cores are correspondingly installed in the two templates, and the two templates are arranged in the mold core assembly; the two mold cores are enclosed to form a mold cavity, a PIN needle is arranged in the mold cavity, the two groups of fixing heads are respectively arranged on the two mold cores in a penetrating manner, and the two groups of fixing heads are used for fixing the PIN needle; two-way clamping and positioning are formed for the PIN through the two sets of oppositely-arranged fixing heads, uniform and controllable clamping force is provided in cooperation with an inflation driving structure, injection molding high-pressure impact can be effectively resisted, positioning holes do not need to be formed in the PIN, and the product installation space can be saved.

Description

Technical Field

[0001] This invention belongs to the field of injection mold technology, specifically relating to an air injection piston mechanism and a PIN pin positioning injection molding device containing the mechanism. Background Technology

[0002] As core conductive components in electronic connectors, automotive electronic components, and consumer electronics, PIN pins undergo plastic injection molding, a crucial process for achieving integrated product structure and ensuring conductive stability. By precisely fixing the PIN pins into the mold cavity and then injecting molten plastic, a firmly bonded integrated product is formed between the plastic and the PIN pins. To address the fixing issues during PIN pin injection molding, many solutions incorporate positioning holes in the PIN pin structure. These holes, in conjunction with positioning components within the mold, limit the PIN pin's position, reducing the risk of displacement during injection molding.

[0003] A search revealed that CN214026824U discloses a flexible extrusion fixing mechanism to prevent pin wobbling during injection molding. The mechanism includes a base, a molding insert, and a pin fixing insert. The side of the pin fixing insert extending from the base has a groove for inserting the pin. One end of the groove extends to the top surface of the pin fixing insert to form an opening. The side of the pin fixing insert opposite to the molding insert has a receiving groove along its length, which communicates with the groove. Flexible fluororubber is placed in the receiving groove, and the width of the flexible fluororubber is greater than the depth of the receiving groove.

[0004] However, existing injection molds lack positioning structures for PIN pins. The PIN pins themselves are made of relatively soft material, and the high pressure generated by the molten plastic during injection molding can easily cause the PIN pins to deviate or deform, affecting the electrical conductivity of the product. Furthermore, the positioning holes designed on the PIN pins will occupy a lot of installation space, making the overall structural layout difficult. Summary of the Invention

[0005] The purpose of this invention is to provide an injection piston mechanism and a PIN positioning injection molding device containing the mechanism, so as to solve the problem mentioned in the background art that the existing injection mold lacks a positioning structure for the PIN, and the high pressure generated by the molten plastic during the injection process easily leads to the PIN being misaligned and deformed.

[0006] To achieve the above objectives, the present invention provides the following technical solution: An air injection piston mechanism includes a template assembly and a mold core assembly. The template assembly includes two opposing templates, and the mold core assembly includes two opposing mold cores. The two mold cores are correspondingly installed within the two templates, and the two mold cores enclose a cavity. A pin is provided within the cavity. The mechanism also includes: Two sets of fixing heads are respectively installed through the two mold cores, and the two sets of fixing heads are used to fix the PIN pins; Two sets of drive structures are respectively set on two templates, and the drive structures are connected to the corresponding fixed heads for driving the fixed heads to move within the mold core to move closer to or away from the PIN pins.

[0007] In one embodiment, the fixing head includes: The connecting seat has a groove on one side of the mold core, and the connecting seat is installed in the groove. The end of the fixing head away from the PIN pin is connected to the connecting seat. The inner wall of the groove has a through hole, and the fixing head is installed in the through hole.

[0008] In one embodiment, the driving structure includes: Piston 1: A movable hole is provided on one side of the template, and piston 1 is installed in the movable hole and connected to the connecting seat. Vent hole one and vent hole two are spaced apart on the inner wall of the movable hole, and piston one is located between vent hole one and vent hole two. When air is introduced into the vent hole, the piston can be driven to move along the movable hole towards the PIN needle. The piston drives the fixed head to move synchronously through the connecting seat and abuts and positions itself against the PIN needle. When air is introduced into the second vent, the piston can be driven to move back along the movable hole. The piston drives the fixed head to move away from the PIN pin synchronously and disengage from the contact through the connecting seat.

[0009] In one embodiment, the template is equipped with two inflation / deflation ports, and vent hole one and vent hole two are respectively connected to the two inflation / deflation ports.

[0010] In one embodiment, a sealing cap is installed on the template, and the sealing cap seals over the opening of the movable hole.

[0011] In one embodiment, a buffer slot is provided on one side of the mold core, and a buffer mechanism is provided in the buffer slot for temporarily storing the injection molding material in the buffer slot.

[0012] In one embodiment, the caching mechanism includes: A buffer head is installed in a buffer slot, and a driving mechanism is provided in the buffer slot. The fixed head is connected to the buffer head through the driving mechanism. Piston 2 is installed in the buffer slot and is located at the end of the buffer head away from the drive mechanism.

[0013] In one embodiment, an adjustment groove is provided at one end of the buffer head near the piston 2, and a screw is installed at one end of the piston 2 near the buffer head, with the screw threadedly connected to the adjustment groove.

[0014] In a preferred embodiment, an elastic element is installed in the adjustment groove, with one end of the elastic element connected to a screw and the other end connected to the inner wall of the adjustment groove.

[0015] In a preferred embodiment, the drive mechanism includes: The transmission rod has one end set in the buffer slot and the other end connected to the fixed head; Gear 1 is installed in the buffer slot, and a rack is installed on the side of the transmission rod near gear 1, and the rack meshes with gear 1; Gear 2 is installed in the buffer slot and meshes with gear 1. The lead screw is installed on the inner wall of the buffer slot at one end and threaded to the buffer head at the other end. The lead screw is connected to gear two.

[0016] In one embodiment, a first bevel gear is mounted on the lead screw, and a second bevel gear is mounted on one side of the second gear, the second bevel gear meshing with the first bevel gear.

[0017] A PIN positioning injection molding device includes an air injection piston mechanism as described above.

[0018] Compared with the prior art, the beneficial effects of the present invention are: The pins are bidirectionally clamped and positioned by two sets of opposing fixed heads, and the pneumatic drive structure provides uniform and controllable clamping force, which can effectively resist the impact of high pressure during injection molding. Moreover, there is no need to open positioning holes on the pins, which can save product installation space.

[0019] The cavity area vacated after the stored injection molding filling head is removed by the buffer mechanism can completely enclose the PIN pin, preventing the PIN pin from being exposed.

[0020] The threaded adjustment structure of the piston and buffer head allows for flexible adjustment of the buffer tank's storage capacity, adapting to the usage requirements of different specifications of PIN pins or the extension length of the fixed head, thus improving the versatility of the mechanism. Attached Figure Description

[0021] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0022] Figure 2 This is a cross-sectional schematic diagram of the template assembly and the mold core assembly of the present invention.

[0023] Figure 3 This is a schematic diagram of the piston, connecting seat, and fixing head of the present invention.

[0024] Figure 4 This is a schematic diagram of the piston, fixing head, and PIN pin of the present invention.

[0025] Figure 5 This is a cross-sectional schematic diagram of the template assembly, mold core assembly, and piston of the present invention.

[0026] Figure 6 This is a cross-sectional schematic diagram of the mold core assembly and drive mechanism of the present invention.

[0027] Figure 7 This is a schematic diagram of the driving mechanism and the buffer mechanism of the present invention.

[0028] Figure 8 This is a cross-sectional schematic diagram of the piston and buffer head of the present invention.

[0029] In the picture: 100. Template assembly; 101. Movable hole; 102. Sealing cap; 103. Vent hole one; 104. Vent hole two; 200. Mold core assembly; 201. Groove; 202. Buffer slot; 300. Piston 1; 301. Connecting seat; 302. Fixed head; 400, PIN pins; 500. Drive mechanism; 501. Transmission rod; 502. Gear 1; 503. Gear 2; 504. Lead screw; 505. First bevel gear; 506. Second bevel gear; 600. Buffer mechanism; 601. Buffer head; 602. Piston II; 603. Screw; 604. Elastic element. Detailed Implementation

[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] Example 1: Please refer to Figures 1-8 An injection piston mechanism includes a template assembly 100 and a mold core assembly 200. The template assembly 100 includes two opposing templates, and the mold core assembly 200 includes two opposing mold cores. The two mold cores are correspondingly installed within the two templates, and the two mold cores enclose a cavity. A pin 400 is provided within the cavity. The mechanism also includes: Two sets of fixing heads 302 are respectively installed through the two mold cores. The two sets of fixing heads 302 are used to fix the PIN pins 400. Two sets of drive structures are respectively set on two templates, and the drive structures are connected to the corresponding fixed heads 302 for driving the fixed heads 302 to move within the mold core to approach or move away from the PIN pins 400.

[0032] Specifically, two corresponding mold cores installed within the template enclose the cavity required for encapsulating the PIN pin 400, providing a spatial basis for subsequent injection molding. The PIN pin 400 is fixed by two sets of fixing heads 302. These fixing heads 302 penetrate the mold core and can directly act on the PIN pin 400 within the cavity. The two sets of fixing heads 302 are arranged corresponding to the two sides of the mold core, forming a bidirectional clamping and positioning from above and below the PIN pin 400. A drive structure, as a power output unit, is installed on the template. Through a transmission connection with the fixing heads 302, it can drive the fixing heads 302 to move within the mold core. When positioning is required, the drive structure drives the two fixing heads 302 to simultaneously approach the PIN pin 400 and form a clamping fixation. After injection molding is completed, the drive structure drives the fixing heads 302 away from the PIN pin 400 to detach. After the fixing heads 302 are removed, the injection molding material fills the space occupied by the fixing heads 302, ensuring that the PIN pin 400 is completely encapsulated in the product, improving the aesthetics of the product after injection molding.

[0033] In one embodiment, the fixing head 302 includes: a connecting seat 301, a groove 201 is provided on one side of the mold core, the connecting seat 301 is installed in the groove 201, the end of the fixing head 302 away from the PIN pin 400 is connected to the connecting seat 301, a through hole is provided on the inner wall of the groove 201, and the fixing head 302 is installed in the through hole.

[0034] Specifically, the groove 201 on one side of the mold core provides installation space and a limiting function for the connecting seat 301, ensuring that the connecting seat 301 is stably assembled without occupying the effective space of the cavity and avoiding interference with injection molding; the through hole on the mold core is adapted to the fixing head 302, providing a through installation channel for the fixing head 302 and also serving as a guide, limiting the movement of the fixing head 302 only along the axis of the through hole, ensuring the movement accuracy of the fixing head 302 when it approaches or moves away from the PIN pin 400; the connecting seat 301, as an intermediate component for power transmission, establishes a transmission connection with the drive structure at one end and connects to the fixing head 302 at the other end, which can transmit the power of the drive structure to the fixing head 302. Combined with the corresponding settings on both sides of the mold core, the two sets of fixing heads 302 can move precisely and synchronously along the through hole under the action of the drive structure, realizing bidirectional stable clamping and reliable release of the PIN pin 400.

[0035] In one embodiment, the driving structure includes: a piston 300; a movable hole 101 is provided on one side of the template; the piston 300 is installed in the movable hole 101; and the piston 300 is connected to the connecting seat 301; a vent hole 103 and a vent hole 104 are provided at intervals on the inner wall of the movable hole 101, and the piston 300 is located between the vent hole 103 and the vent hole 104. When air is introduced into vent 103, piston 300 can be driven to move along movable hole 101 towards the PIN pin 400. Piston 300 drives fixed head 302 to move synchronously through connecting seat 301 and abuts and positions with PIN pin 400. When air is introduced into vent 104, piston 300 can be driven to move back along movable hole 101. Piston 300 drives fixed head 302 to move away from PIN pin 400 synchronously through connecting seat 301 and disengage.

[0036] In the above technical solution, the movable hole 101 provides a sliding guide for the piston 300, ensuring that the piston 300 moves only along the axial direction and avoiding deviation that affects the accuracy of power transmission. The piston 300, as a power actuator, is located between the vent hole 103 and the vent hole 104, so that the two vent holes can form a reverse pressure difference when they are alternately filled with air, providing stable power for the reciprocating movement of the piston 300. When air is filled into the vent hole 103, the vent hole 104 is in the exhaust state, and the gas pressure acts on one side of the piston 300, pushing the piston 300 to move closer to the PIN needle 400. The power is synchronously transmitted to the fixed head 302 through the connecting seat 301, realizing the contact positioning of the fixed head 302 with the PIN needle 400. When air is filled into the vent hole 104, the vent hole 103 is in the exhaust state, and the gas pressure pushes the piston 300 to reset, thereby driving the fixed head 302 away from the PIN needle 400 and disengaging it.

[0037] The drive structure adopts an air-filled drive method that combines a piston with a vent. The piston 300 reciprocates by alternating air filling through vent 103 and vent 2 104. The gas driving force is more stable and the pressure is controllable, which can drive the fixed head 302 to move closer and further away at a uniform speed. This makes the clamping force of the fixed head 302 on the PIN 400 uniform and gentle, effectively avoiding deformation of the PIN 400 caused by uneven driving force or impact.

[0038] In one embodiment, the template is equipped with two inflation / deflation ports, and vent hole 103 and vent hole 2 104 are respectively connected to the two inflation / deflation ports.

[0039] Specifically, both inflation and deflation ports can be used for inflation and deflation. When an external air source supplies gas to the vent 103 or vent 2 104 through the corresponding inflation and deflation ports, a directional pressure difference can be quickly formed in the movable hole 101, driving the piston 300 to move precisely along the movable hole 101. The fixed head 302 is then driven by the connecting seat 301 to complete the positioning or disengagement action.

[0040] In one embodiment, a sealing cap 102 is installed on the template, and the sealing cap 102 seals and covers the opening of the movable hole 101; the sealing cap 102 can effectively prevent gas leakage in the movable hole 101 and ensure the airtightness of the gas path.

[0041] In one embodiment, a buffer groove 202 is provided on one side of the mold core, and a buffer mechanism 600 is provided in the buffer groove 202. The buffer mechanism 600 is used to temporarily store the injection molding material in the buffer groove 202. The buffer mechanism 600 includes: a buffer head 601, installed in the buffer groove 202, and a drive mechanism 500 is provided in the buffer groove 202. The fixed head 302 is connected to the buffer head 601 through the drive mechanism 500; and a second piston 602, installed in the buffer groove 202, and the second piston 602 is located at the end of the buffer head 601 away from the drive mechanism 500.

[0042] In the above technical solution, the design of the buffer groove 202 and the buffer mechanism 600 is precisely matched to the cavity space changes when the fixed head 302 extends and positions itself. When the fixed head 302 extends to clamp the PIN needle 400 and occupies part of the cavity space, the buffer groove 202 can directly receive the excess injection plastic generated after quantitative injection molding, avoiding the problem of sudden pressure rise or overflow caused by excess injection plastic, preventing the PIN needle 400 from being displaced or deformed by high pressure, and ensuring the stable electrical conductivity of the PIN needle 400. When the fixed head 302 retracts and is withdrawn, the buffer head 601 drives the piston 602 to push out the injection plastic stored in the buffer groove 202, which just fills the cavity area vacated after the fixed head 302 is withdrawn, ensuring that the cavity is completely filled without molding defects such as missing material or shrinkage marks, improving the structural integrity and coating quality of the product. There is no need to adjust the amount of injection plastic, which simplifies the injection molding process control and avoids the waste caused by excess injection plastic.

[0043] In one embodiment, the buffer head 601 has an adjustment groove at one end near the piston 602, and a screw 603 is installed at one end of the piston 602 near the buffer head 601. The screw 603 is threadedly connected to the adjustment groove. An elastic element 604 is installed in the adjustment groove. One end of the elastic element 604 is connected to the screw 603, and the other end is connected to the inner wall of the adjustment groove.

[0044] Specifically, the elastic element 604 is a compression spring, or it can be an elastic block. Through the threaded connection between the screw 603 and the adjustment groove, the piston 602 can be rotated to flexibly adjust its position within the buffer groove 202, adapting to the cavity space changes corresponding to the extension length of different specifications of PIN pins 400 or fixed heads 302, and adjusting the amount of injection plastic stored in the buffer groove 202 as needed, thereby improving the adaptability and versatility of the mechanism for different products. When the piston 602 rotates, it drives the screw 603 to drive the screw threadedly within the adjustment groove, and after the piston 602 is adjusted to the target position, the elastic element 604 will be in a pre-compressed state and generate a continuous elastic pre-tightening force. This pre-tightening force acts on the end of the screw 603, forming an axial positioning constraint force, tightly fitting the threaded connection surface to eliminate gaps, effectively resisting external forces such as material flow impact and mechanism vibration during injection molding, and preventing relative rotation or axial displacement between the screw 603 and the adjustment groove.

[0045] In a preferred embodiment, the drive mechanism 500 includes: a transmission rod 501, one end of which is disposed in the buffer slot 202, and the other end of which is connected to the fixed head 302; a first gear 502, installed in the buffer slot 202, with a rack mounted on the side of the transmission rod 501 near the first gear 502, the rack meshing with the first gear 502; a second gear 503, installed in the buffer slot 202, meshing with the first gear 502; and a lead screw 504, one end of which is installed on the inner wall of the buffer slot 202, and the other end of which is threaded to the buffer head 601, the lead screw 504 being connected to the second gear 503. A first bevel gear 505 is mounted on the lead screw 504, and a second bevel gear 506 is mounted on one side of the second gear 503, the second bevel gear 506 meshing with the first bevel gear 505.

[0046] In the above technical solution, the drive mechanism 500 uses the linear movement of the fixed head 302 as the power input source, converting the linear motion of the fixed head 302 into the rotational motion of gear one 502; gear one 502 meshes with gear two 503 to achieve power transmission, and the second bevel gear 506 on gear two 503 meshes with the first bevel gear 505 on the lead screw 504, changing the transmission direction while transmitting the rotational motion to the lead screw 504; the rotational motion of the lead screw 504 is then converted into the buffer head 601 moving along the buffer groove 20 2. Linear motion along the axis; When the drive structure drives the fixed head 302 to extend and approach the PIN pin 400, the fixed head 302 drives the transmission rod 501 to move synchronously, the rack drives the first gear 502 to rotate, and through the second gear 503 and the bevel gear, drives the lead screw 504 to rotate, causing the buffer head 601 to move away from the cavity, and the volume of the buffer groove 202 to expand to store excess injection plastic; When the fixed head 302 retracts and withdraws, the buffer head 601 moves towards the cavity, pushing the injection plastic to fill the empty area of ​​the cavity.

[0047] Specifically, the diameter of gear 502 is larger than the diameter of gear 503; gear 502 and gear 503 form a meshing transmission pair with a fixed transmission ratio. According to the basic principle of gear transmission, the number of rotations of the two meshing gears is inversely proportional to their diameters. Since the diameter of gear 502 is larger than that of gear 503, gear 503 can rotate more times for every one rotation of gear 502, thus amplifying the number of rotations. Gear 503 meshes with the first bevel gear 505 on the lead screw 504 through the second bevel gear 506, amplifying the rotational motion. The synchronous transmission is transmitted to the lead screw 504, so that the number of rotations of the lead screw 504 is consistent with that of the second gear 503. Compared with the direct drive of the lead screw 504 by the first gear 502, the number of rotations is increased. Since the lead screw 504 and the buffer head 601 are connected by threads, the number of rotations of the lead screw 504 directly determines the linear travel of the buffer head 601. With the pitch of the lead screw 504 fixed, the increase in the number of rotations can directly amplify the travel of the buffer head 601, ensuring that the buffer head 601 can accurately adjust the backward distance according to the extension length of the fixed head 302.

[0048] Example 2: A PIN pin positioning injection molding device, including the gas injection piston mechanism of Example 1.

[0049] The working principle and usage process of this invention: An external air source inflates the drive structure through the inflation / deflation port on the template, supplying air to the vent hole 103 and venting air to the vent hole 104. A pressure difference is formed in the movable hole 101, driving the piston 300 to move along the movable hole 101 towards the PIN pin 400. The piston 300 drives the fixing head 302 to move precisely along the through hole of the mold core through the connecting seat 301. The fixing heads 302 on both sides simultaneously approach and clamp the PIN pin 400 in the cavity, while the fixing heads 302 drive the drive motor. When the transmission rod 501 of the structure 500 moves, the rack on the transmission rod 501 drives the first gear 502 to rotate. Since the diameter of the first gear 502 is larger than that of the second gear 503, the first gear 502 drives the second gear 503 to rotate multiple times. The second gear 503 changes the transmission direction by meshing with the first bevel gear 505 on the lead screw 504 through the second bevel gear 506, which drives the lead screw 504 to rotate. The lead screw 504 and the buffer head 601 are threaded together, causing the buffer head 601 to move away from the cavity. The volume of the buffer groove 202 expands to form a material storage space.

[0050] Subsequently, the molten plastic is injected into the cavity enclosed by the two mold cores. Because the fixed head 302 occupies part of the cavity space, the excess plastic flows into the buffer tank 202 and is temporarily stored. During the injection process, the sealing cover 102 ensures the air passage of the movable hole 101 is sealed, and the elastic element 604 keeps the position of the piston 602 stable through the preload.

[0051] After injection molding is completed, the external air source is switched to pressurize the second vent 104 and exhaust the first vent 103. The piston 300 resets and drives the fixed head 302 to retract along the through hole and disengage from the PIN pin 400. At the same time, the fixed head 302 drives the transmission rod 501 to move in the opposite direction. The rack drives the first gear 502 and the second gear 503 to rotate in the opposite direction. Through the bevel gear transmission, the lead screw 504 rotates in the opposite direction. The buffer head 601 moves towards the cavity and pushes the second piston 602, accurately pushing the excess injection plastic stored in the buffer groove 202 to the cavity area vacated after the fixed head 302 is removed, so as to achieve complete cavity filling.

[0052] If it is necessary to adapt to different specifications of PIN pins 400 or adjust the extension length of the fixed head 302, the piston 602 can be rotated to move the screw 603 along the adjustment groove thread of the buffer head 601. Adjust the position of the piston 602 in the buffer groove 202 to change the storage volume. The elastic element 604 always provides pre-tightening force to eliminate thread gaps and ensure positional stability. Finally, the template and the mold core are separated, and the molded product with PIN pins 400 completely wrapped, no missing material shrinkage marks and meeting the sealing performance standard is taken out, completing one complete work cycle.

[0053] The PIN pin 400 is bidirectionally clamped and positioned by two sets of opposing fixed heads 302. Combined with the pneumatic drive structure, it provides uniform and controllable clamping force, which can effectively resist the impact of high pressure during injection molding. Moreover, there is no need to open positioning holes on the PIN pin 400, which can save product installation space.

[0054] The cavity area vacated after the stored injection molding filling fixing head 302 is removed by the buffer mechanism 600 can completely enclose the PIN pin 400, preventing the PIN pin 400 from being exposed.

[0055] The threaded adjustment structure of piston 2 602 and buffer head 601 allows for flexible adjustment of the storage capacity of buffer slot 202, adapting to the usage requirements of different specifications of PIN pin 400 or fixed head 302 extension length, thus improving the versatility of the mechanism.

[0056] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An injection piston mechanism, comprising a template assembly and a mold core assembly, the template assembly comprising two opposing templates, the mold core assembly comprising two opposing mold cores, the two mold cores being correspondingly installed within the two templates, the two mold cores enclosing a cavity, the cavity being provided with a pin, characterized in that, Also includes: Two sets of fixing heads are respectively installed through the two mold cores, and the two sets of fixing heads are used to fix the PIN pins; Two sets of drive structures are respectively set on two templates, and the drive structures are connected to the corresponding fixed heads for driving the fixed heads to move within the mold core to move closer to or away from the PIN pins.

2. The gas injection piston mechanism according to claim 1, characterized in that: The fixing head includes: The connecting seat has a groove on one side of the mold core, and the connecting seat is installed in the groove. The end of the fixing head away from the PIN pin is connected to the connecting seat. The inner wall of the groove has a through hole, and the fixing head is installed in the through hole.

3. The gas injection piston mechanism according to claim 2, characterized in that: The driving structure includes: Piston 1: A movable hole is provided on one side of the template, and piston 1 is installed in the movable hole and connected to the connecting seat. Vent hole one and vent hole two are spaced apart on the inner wall of the movable hole, and piston one is located between vent hole one and vent hole two. When air is introduced into the vent hole, the piston can be driven to move along the movable hole towards the PIN needle. The piston drives the fixed head to move synchronously through the connecting seat and abuts and positions itself against the PIN needle. When air is introduced into the second vent, the piston can be driven to move back along the movable hole. The piston drives the fixed head to move away from the PIN pin synchronously and disengage from the contact through the connecting seat.

4. The gas injection piston mechanism according to claim 3, characterized in that: The template is equipped with two inflation / deflation ports, and vent hole one and vent hole two are respectively connected to the two inflation / deflation ports.

5. The gas injection piston mechanism according to claim 3, characterized in that: A sealing cap is installed on the template, and the sealing cap seals and covers the opening of the movable hole.

6. The gas injection piston mechanism according to claim 2, characterized in that: A buffer slot is provided on one side of the mold core, and a buffer mechanism is provided in the buffer slot. The buffer mechanism is used to temporarily store the injection molding material in the buffer slot.

7. The gas injection piston mechanism according to claim 6, characterized in that: The caching mechanism includes: A buffer head is installed in a buffer slot, and a driving mechanism is provided in the buffer slot. The fixed head is connected to the buffer head through the driving mechanism. Piston 2 is installed in the buffer slot and is located at the end of the buffer head away from the drive mechanism.

8. The gas injection piston mechanism according to claim 7, characterized in that: An adjustment groove is provided at one end of the buffer head near the piston 2, and a screw is installed at one end of the piston 2 near the buffer head. The screw is threadedly connected to the adjustment groove.

9. The gas injection piston mechanism according to claim 8, characterized in that: An elastic element is installed inside the adjustment groove. One end of the elastic element is connected to the screw, and the other end is connected to the inner wall of the adjustment groove.

10. The gas injection piston mechanism according to claim 7, characterized in that: The drive mechanism includes: The transmission rod has one end set in the buffer slot and the other end connected to the fixed head; Gear 1 is installed in the buffer slot, and a rack is installed on the side of the transmission rod near gear 1, and the rack meshes with gear 1; Gear 2 is installed in the buffer slot and meshes with gear 1. The lead screw is installed on the inner wall of the buffer slot at one end and threaded to the buffer head at the other end. The lead screw is connected to gear two.

11. The gas injection piston mechanism according to claim 10, characterized in that: A first bevel gear is mounted on the lead screw, and a second bevel gear is mounted on one side of the second gear, which meshes with the first bevel gear.

12. A PIN positioning injection molding device according to claim 1, characterized in that, Includes the gas injection piston mechanism as described in any one of claims 1-11.

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