Blow pin structure for a blow mold

Abstract

The utility model discloses a blow pin structure of blow mould, including fixed base, the fixed base left side front portion fixedly connected with fixed link, the fixed link is away from the one end swing assembly of tooth groove, the one end fixed sleeve of swing base is provided with gear, the middle part fixedly connected with trachea of swing base, the trachea front end is provided with heating pipe, the heating pipe front end is welded with installation screw head, the installation screw head front end screw connection has and blows needle head, the fixed base inside is provided with tooth groove. The utility model discloses be provided with tooth bar, gear, swing base, fixed link, blow needle head and lock bolt, can realize the angle regulation function of blow needle head, adapts the die cavity of different water gap direction, forms the reasonable draw -in mould slope, effectively improves the problem that water gap material is taken out by blow needle head after opening mould, avoids the defect caused by the overlapping of the residual water gap material of multiple bucket parts, reduces manual processing time to improve blow mould continuous production efficiency and the qualified rate.

Description

Technical Field

[0001] This utility model relates to the field of blow molding die technology, specifically to a blow needle structure for a blow molding die. Background Technology

[0002] Blow molding is a common hollow thermoplastic molding method, mainly suitable for producing hollow products such as plastic buckets, bottles, and cans. Its basic principle is to place a molten plastic preform into a mold, and then blow compressed air into it through a blow needle, causing it to conform and mold within the mold cavity. The blow needle primarily functions to deliver airflow and complete the blow molding process; its insertion angle and ejection path directly affect the molding quality and demolding efficiency of the product.

[0003] Currently, common blow molding needle structures are typically designed with a fixed angle, meaning the blow molding needle is inserted vertically into the mold cavity and retracts vertically after blow molding. While this structure is easy to implement mechanically, it also has some drawbacks, such as:

[0004] The blow-off needle has a single insertion angle, and its ejection path overlaps with the direction of the sprue. When the mold opens, the downward retraction path of the blow-off needle easily comes into contact with the sprue material, causing it to be carried out with the sprue, resulting in incomplete demolding. If the residual sprue material sticks to or falls into the next blank, it will cause defects such as sprue overlap and product deformation. This not only affects the yield rate but also requires machine shutdown for cleaning, increasing maintenance costs and downtime, and reducing overall production efficiency.

[0005] Therefore, there is an urgent need for a blow needle structure for blow molding dies to solve the above-mentioned technical defects. Utility Model Content

[0006] The purpose of this invention is to provide a blow pin structure for blow molding molds, so as to solve the problems mentioned in the background art, such as the blow pin having a single ejection angle, the return path easily coming into contact with the sprue material, resulting in incomplete demolding and affecting the yield.

[0007] To achieve the above objectives, this utility model provides the following technical solution: a blow needle structure for a blow molding die, comprising a fixed base, a fixed rod fixedly connected to the front left side of the fixed base, a rotating base movably mounted at the end of the fixed rod away from the tooth groove, a gear fixedly sleeved at one end of the rotating base, an air pipe fixedly connected to the middle of the rotating base, a heating tube provided at the front end of the air pipe, a mounting screw head welded to the front end of the heating tube, a blow needle head threadedly connected to the front end of the mounting screw head, a tooth groove opened inside the fixed base, a toothed rod embedded in the tooth groove, the toothed rod meshing with the gear, a locking bolt fixed to the outer wall of the tooth groove, and the toothed rod and the gear fixedly connected by the locking bolt.

[0008] As a further technical solution of this utility model, an air hole is provided in the lower part of the air tube, and the air tube is connected to the air blowing device through the air hole.

[0009] As a further technical solution of this utility model, the rack and the fixed seat are perpendicular to each other, forming a cross-shaped adjustment structure.

[0010] As a further technical solution of this utility model, the end of the blow needle is threaded, and the blow needle is screwed to the mounting screw head through the thread.

[0011] As a further technical solution of this utility model, a guide plate is welded to the bottom left side of the fixed base, and an arc-shaped guide groove is opened in the guide plate. A slider is welded to the end of the air tube away from the blow needle head, and the slider is embedded in the guide groove and forms a sliding connection with the guide plate.

[0012] As a further technical solution of this utility model, a threaded seat is welded to the end of the fixed seat away from the guide plate, and a screw is connected to the threaded seat by a thread. A servo motor is installed at the bottom end of the screw, and the output shaft of the servo motor is fixedly connected to the screw.

[0013] Compared with the prior art, the beneficial effects of this utility model are: by setting up a rack, gear, rotating seat, fixing rod, blow needle and locking bolt, the angle adjustment function of the blow needle can be realized, adapting to the mold cavity with different sprue directions, forming a reasonable draft angle, effectively improving the problem of sprue material being carried out by the blow needle after mold opening, avoiding defects caused by the overlapping of sprue material residue in multiple barrel parts, reducing manual processing time, and thus improving the continuous production efficiency and pass rate of blow molding molds;

[0014] By setting guide plates, guide grooves and sliders, a stable and reliable guide limit can be formed during the adjustment of the blow needle head angle, preventing the blow needle head from being jammed or collided with the mold due to excessive rotation during manual adjustment, and avoiding directional deviation and shaking;

[0015] Equipped with a servo motor, screw, threaded seat, and fixed seat, it is suitable for repeated insertion and removal and frequent start-up of the blow needle mechanism, which can improve the control accuracy of the blow needle in the automated station of blow molding. Attached Figure Description

[0016] Figure 1 This is a frontal cross-sectional view of the present invention.

[0017] Figure 2 This is a front view structural diagram of the fixing base of this utility model;

[0018] Figure 3 This is a side view of the blow needle head structure of this utility model;

[0019] Figure 4 For the present utility model Figure 1 A magnified view of the structure at point A in the middle.

[0020] In the diagram: 1. Blow needle; 2. Mounting screw; 3. Heating tube; 4. Air tube; 6. Rotary seat; 7. Gear; 8. Fixing rod; 9. Gear groove; 10. Gear rack; 11. Locking bolt; 12. Guide plate; 13. Guide groove; 14. Slider; 15. Fixing seat; 16. Threaded seat; 17. Screw; 18. Servo motor. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] Please see Figure 1-4 The present invention provides an embodiment of a blow molding die blow needle structure, including a fixed base 15, a fixed rod 8 fixedly connected to the front left side of the fixed base 15, a rotating base 6 movably mounted on the end of the fixed rod 8 away from the tooth groove 9, a gear 7 fixedly sleeved on one end of the rotating base 6, an air pipe 4 fixedly connected to the middle of the rotating base 6, a heating pipe 3 provided at the front end of the air pipe 4, a mounting screw head 2 welded to the front end of the heating pipe 3, a blow needle head 1 threadedly connected to the front end of the mounting screw head 2, a tooth groove 9 opened inside the fixed base 15, a toothed rod 10 embedded in the tooth groove 9, the toothed rod 10 meshing with the gear 7, a locking bolt 11 fixed on the outer wall of the tooth groove 9, the toothed rod 10 and the gear 7 fixedly connected by the locking bolt 11, the toothed rod 10 and the fixed base 15 being perpendicular to each other, forming a cross-shaped adjustment structure;

[0023] Specifically, such as Figure 1 and Figure 2 As shown, during the blow molding mold preparation stage, by loosening the locking bolt 11, the operator can manually pull the rack 10. The rack 10 meshes with the gear 7, driving the rotating seat 6 to rotate, thereby achieving the overall deflection of the blow needle head 1 to a set angle, such as 30°. This structure can be adapted to mold cavities with different sprue directions according to product design needs, forming a reasonable draft angle, effectively improving the problem of sprue material being carried out by the blow needle head 1 after mold opening.

[0024] A guide plate 12 is welded to the bottom left side of the fixed base 15. An arc-shaped guide groove 13 is opened in the guide plate 12. A slider 14 is welded to the end of the air pipe 4 away from the blow needle head 1. The slider 14 is embedded in the guide groove 13 and forms a sliding connection with the guide plate 12.

[0025] Specifically, such as Figure 1 and Figure 2As shown, when manually adjusting the angle of the blow needle head 1, the slider 14 slides in the guide groove 13 as it rotates. Since the guide plate 12 is a limiting component that is fixedly welded to the fixed base 15, its arc-shaped guide groove 13 can limit the slider 14 to deflect within the set angle range, thereby constraining the rotation range of the blow needle head 1. This structure can prevent the blow needle head 1 from being jammed or collided with the mold due to excessive rotation during manual adjustment.

[0026] A threaded seat 16 is welded to the end of the fixed seat 15 away from the guide plate 12. A screw 17 is connected to the threaded seat 16 by a thread. A servo motor 18 is installed at the bottom of the screw 17. The output shaft of the servo motor 18 is fixedly connected to the screw 17.

[0027] Specifically, such as Figure 1 and Figure 2 As shown, during the insertion and retraction of the blow needle 1 into the mold cavity, the servo motor 18 outputs torque to drive the screw 17 to rotate. The screw 17 is threadedly engaged with the threaded seat 16, causing the fixed seat 15 to move linearly along the feed direction, thereby realizing the insertion or retraction of the blow needle 1 into the mold. The screw 17 uses a standard trapezoidal thread with a thread helix angle less than the equivalent friction angle, which has good self-locking properties and can maintain the current position when the servo motor 18 is powered off, preventing position drift. The servo motor 18 is model 60ST-M01330 and has encoder closed-loop control function, which is suitable for repeated insertion and removal and frequent start-up of the blow needle mechanism.

[0028] An air hole is provided in the lower part of the air tube 4. The air tube 4 is connected to the air blowing device through the air hole. The end of the blowing needle 1 is threaded. The blowing needle 1 is screwed to the mounting screw head 2 through the thread.

[0029] Specifically, such as Figure 1 and Figure 2 As shown, the blow needle 1 is installed in front of the mounting screw head 2 by a thread. It can be disassembled and replaced according to the needs of blow molding, which is convenient for maintenance or to adapt to different specifications of blow needle 1.

[0030] Working principle: During the debugging phase, the operator first loosens the locking bolt 11, unlocks the rack 10, and manually pulls the rack 10. This engages with the gear 7, causing the gear 7 and its connected rotating seat 6 to rotate. This, in turn, drives the connected air pipe 4, heating pipe 3, mounting screw head 2, and blow needle head 1 to deflect as a whole. The deflection angle is typically adjusted to around 30° to accommodate different sprue directions in the mold cavity, providing a suitable incident angle for subsequent needle insertion. The arc-shaped guide groove 13 on the guide plate 12 slides in conjunction with the slider 14 at the end of the air pipe 4, limiting the rotation of the blow needle head 1 within a set range to prevent excessive deflection. The slider 14, welded to the tail end of the air pipe 4, rotates with the overall structure and slides within the arc-shaped guide groove 13 in the guide plate 12, preventing the blow needle head 1 from deflecting excessively. Excessive rotation of the needle 1 can cause interference with the mold or adjustment errors. The servo motor 18 is then activated, causing the screw 17 to rotate. This, in turn, pushes the fixed seat 15 to move linearly along the guide rail via the threaded seat 16, thereby inserting the blow needle 1 into the mold cavity. An air hole is located at the lower part of the air pipe 4, connecting to an external blowing device. Gas flows in and is transported to the front end via the air pipe 4. After being heated by electric heating in the heating pipe 3, the gas enters the internal channels of the mounting screw 2 and the blow needle 1, and is finally ejected from the end of the blow needle 1 to perform directional blow molding on the plastic parts in the mold. After blow molding is complete, the motor reverses, and the blow needle 1 retracts with the fixed seat 15, exiting the mold cavity. The trapezoidal thread helix angle of the screw 17 is less than the equivalent friction angle, providing self-locking properties. No positional shift will occur after the motor is powered off.

[0031] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A blow needle structure for a blow molding die, comprising a fixed base (15), characterized in that: A fixing rod (8) is fixedly connected to the front left side of the fixing base (15). A rotating seat (6) is movably mounted on the end of the fixing rod (8) away from the tooth groove (9). A gear (7) is fixedly sleeved on one end of the rotating seat (6). An air pipe (4) is fixedly connected to the middle of the rotating seat (6). A heating tube (3) is provided at the front end of the air pipe (4). An installation screw head (2) is welded to the front end of the heating tube (3). A blow needle head (1) is threadedly connected to the front end of the installation screw head (2). A tooth groove (9) is opened inside the fixing base (15). A toothed rod (10) is embedded in the tooth groove (9). The toothed rod (10) meshes with the gear (7). A locking bolt (11) is fixed on the outer wall of the tooth groove (9). The toothed rod (10) and the gear (7) are fixedly connected by the locking bolt (11).

2. The blow needle structure of a blow molding die according to claim 1, characterized in that: An air hole is provided in the lower part of the air pipe (4), and the air pipe (4) is connected to the air blowing device through the air hole.

3. The blow needle structure of a blow molding die according to claim 2, characterized in that: The rack (10) and the fixed seat (15) are perpendicular to each other, forming a cross-shaped adjustment structure.

4. The blow needle structure of a blow molding die according to claim 1, characterized in that: The blow needle (1) has a threaded end, and the blow needle (1) is screwed to the mounting screw head (2) through the thread.

5. The blow needle structure of a blow molding die according to claim 1, characterized in that: A guide plate (12) is welded to the bottom left side of the fixed base (15). An arc-shaped guide groove (13) is provided in the guide plate (12). A slider (14) is welded to the end of the air tube (4) away from the blow needle (1). The slider (14) is embedded in the guide groove (13) and forms a sliding connection with the guide plate (12).

6. The blow needle structure of a blow molding die according to claim 1, characterized in that: The fixed seat (15) is welded with a threaded seat (16) at the end away from the guide plate (12). A screw (17) is connected to the threaded seat (16) by a thread. A servo motor (18) is installed at the bottom of the screw (17). The output shaft of the servo motor (18) is fixedly connected to the screw (17).

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