Blowing device capable of realizing quantitative blowing in blowing machine

Abstract

This invention discloses a blower device for a blow molding machine capable of quantitative blowing, comprising: a turret, with a plurality of mandrel seats sealed on each side wall of the turret; mounting holes on the mandrel seats; partition rings in the mounting holes; injection holes and positioning screw holes communicating with the mounting holes on the mandrel seats; positioning screws threadedly connected to the positioning screw holes; a T-shaped piston slidably and sealed in the mounting holes, the small-diameter section of the T-shaped piston slidingly sealing with the partition rings; a mandrel sleeve fixedly and sealed in the mounting holes; a mandrel movably passing through the mandrel sleeve; the mandrel sealingly fitting against the front side wall of the mandrel sleeve; the mandrel connected to the T-shaped piston; a star-shaped nut fixedly mounted on the mandrel; and a return spring between the star-shaped nut and the mandrel sleeve. This invention can control the opening degree of the air outlet between the mandrel and the mandrel sleeve in each mandrel seat to be consistent by adjusting the positioning screws, thereby ensuring consistent molding quality of blow-molded products in the same batch.

Description

Technical Field

[0001] This invention relates to the field of injection blow molding machines, and more particularly to an air blowing device in an injection blow molding machine that can achieve quantitative air blowing. Background Technology

[0002] The air blowing device in an injection blow molding machine is a core component in product blow molding. Currently, the air blowing devices in injection blow molding machines on the market include... Figure 1 As shown, it includes: a turret 1, a core mounting plate 11 on the side wall of the turret 1, a piston 111 that is slidably and sealed in the core mounting plate 11, a mounting seat 12 on the core mounting plate 11, a core rod body 13 fixed in the mounting seat 12, a core rod head 14 that is movably inserted in the core rod body 13, a positioning nut 15 on the core rod head 14, a spring 16 between the positioning nut 15 and the core rod body 13, and a push plate 17 between the piston 111 and the core rod head 14. Compressed air passes through the inside of the turret 1, causing the piston 111 to push the mandrel head 14 forward via the push plate 17. The mandrel head 14 moves forward after overcoming the elastic force of the spring 16, opening the mandrel head 14 from the mandrel body 13. At this time, the size of the air outlet between the mandrel head 14 and the mandrel body 13 is determined by the stroke of the piston 111. Then, the compressed air enters the mandrel body 13 through the gas channel in the mold core mounting plate 11 and is blown out from the air outlet between the mandrel head 14 and the mandrel body 13. However, during this process, compressed air will further push the mandrel head 14. Since the mandrel head 14, push plate 17 and piston 111 are only abutting structures rather than fixed connections, when the mandrel head 14 is further pushed by compressed air, the mandrel head 14 will continue to move forward without being acted upon by piston 111 and push plate 17. The air outlet between the mandrel head 14 and the mandrel body 13 will increase. However, due to the difference in the flow rate of the compressed air being blown or the difference in the elasticity of the spring 16, the size of the air outlet between each group of mandrel body 13 and mandrel head 14 cannot be controlled. This results in different blowing volumes between different groups of mandrel body 13 and mandrel head 14, ultimately leading to inconsistent molding quality of blow-molded products in the same batch. Summary of the Invention

[0003] The purpose of this invention is to provide an air blowing device in an injection blow molding machine that enables quantitative air blowing, thereby ensuring consistent air outlet opening between the mandrel and mandrel sleeve in each mandrel holder and thus guaranteeing consistent molding quality of blow-molded products in the same batch.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is as follows: an air blowing device in an injection blowing machine capable of quantitative air blowing, comprising: a turret, an air passage with air holes provided on the turret, several individually detachable mandrel seats sealed on the side walls of the turret, mounting holes provided on the mandrel seats that communicate with the air passages and penetrate the front and rear side walls of the mandrel seats, a partition ring provided in the mounting holes, and injection holes and positioning screw holes provided on the mandrel seats that communicate with the mounting holes, the injection holes and positioning screw holes being located on the front and rear sides of the partition ring respectively. On the side, a positioning screw is threaded into the positioning screw hole. A T-shaped piston is slidably and sealingly installed in the mounting hole located behind the separator ring. The small diameter section of the T-shaped piston is slidably sealed with the separator ring. A mandrel sleeve is fixedly and sealingly installed in the mounting hole located in front of the separator ring. The mandrel sleeve in the mounting hole does not interfere with the injection hole. A mandrel is movably inserted in the mandrel sleeve. The mandrel is sealed and fitted with the front side wall of the mandrel sleeve. The mandrel is connected to the T-shaped piston. A star nut is fixedly installed on the mandrel. A return spring is installed between the star nut and the mandrel sleeve.

[0005] Furthermore, in the aforementioned injection blowing machine, there is an air blowing device capable of quantitative air blowing, wherein the front side wall of the mandrel sleeve is a wedge-shaped wall, and a sealing end that can fit against the wedge-shaped wall is provided on the mandrel.

[0006] Furthermore, in the aforementioned injection blowing machine, the blowing device capable of quantitative blowing includes a connection structure between the mandrel seat and the turret as follows: two positioning holes are symmetrically arranged vertically on the rear side wall of the mandrel seat; countersunk holes penetrating the front and rear side walls of the mandrel seat are arranged around the mandrel seat; two rows of positioning pins are symmetrically arranged vertically on the side wall of the turret; two rows of first threaded holes are symmetrically arranged vertically on the side wall of the turret; the two positioning holes on the mandrel seat are respectively inserted into the two symmetrically arranged positioning pins; the four countersunk holes on the mandrel seat are respectively aligned with the four first threaded holes; countersunk bolts are inserted into the countersunk holes; the countersunk bolts are threadedly connected to the corresponding first threaded holes; and the countersunk bolts are submerged in the countersunk holes.

[0007] Furthermore, in the aforementioned injection blowing machine, there is an air blowing device that enables quantitative air blowing. Two limiting plates are symmetrically arranged on the front side wall of the mandrel holder, with semi-circular grooves on the limiting plates. A limiting ring groove is provided on the outer side wall of the mandrel sleeve. The two limiting plates are engaged with the mandrel sleeve through the cooperation between their semi-circular grooves and the limiting ring groove of the mandrel sleeve.

[0008] Furthermore, in the aforementioned injection blowing machine, the blowing device capable of quantitative blowing includes a connection structure between the T-shaped piston and the mandrel as follows: a connecting hole is provided in the T-shaped piston, a limit ring is provided in the connecting hole, a connecting bolt is movably inserted in the connecting hole located behind the limit ring, a connecting rod is sealed and inserted in the connecting hole located in front of the limit ring, and second threaded holes are provided at both ends of the connecting rod. After the connecting bolt passes through the limit ring, it is threadedly connected to the second threaded hole at the rear end of the connecting rod. Both the connecting bolt and the connecting rod abut against the limit ring. An external thread is provided on the mandrel, and the external thread on the mandrel is threadedly connected to the second threaded hole at the front end of the connecting rod. The connecting rod abuts against the star nut.

[0009] Furthermore, the aforementioned injection blower has an air blowing device capable of quantitative air blowing, wherein an inverted conical bottom is provided on the positioning screw, the inverted conical bottom extends into the mounting hole, and an inclined wall is provided on the front side wall of the large-diameter end of the T-shaped piston, which can fit against the inverted conical bottom on the positioning screw.

[0010] Furthermore, in the aforementioned injection blower, there is an air blowing device capable of quantitative air blowing, wherein a locking nut is threaded onto the positioning screw, and the locking nut abuts against the mandrel seat.

[0011] Furthermore, in the aforementioned injection blowing machine, there is an air blowing device capable of quantitative air blowing, wherein two positioning screw holes are symmetrically arranged on the upper and lower side walls of the mandrel seat, and positioning screws are threaded into both positioning screw holes.

[0012] Furthermore, the aforementioned injection blowing machine has an air blowing device that enables quantitative air blowing, wherein a sealing groove is provided on the side wall where the mandrel seat and the turret side wall are in contact, which is coaxially connected with the mounting hole and has an inner diameter larger than the mounting hole, and a flat sealing ring is fitted in the sealing groove, with the turret side wall sealingly abutting against the flat sealing ring.

[0013] Furthermore, the aforementioned injection blower includes an air blowing device capable of quantitative air blowing, wherein a normally closed solenoid valve is installed on the air orifice.

[0014] The advantages of this invention are as follows: By limiting the T-shaped piston with positioning screws and fixing the mandrel to the T-shaped piston, when compressed air pushes the T-shaped piston and mandrel forward, the stroke of the T-shaped piston is limited by the positioning screws. Furthermore, the compressed air in the injection hole cannot further move the mandrel, thus controlling the opening of the air outlet between the mandrel and the mandrel sleeve. Therefore, by simply adjusting the positioning screws on each mandrel seat to be consistent, the opening of the air outlet between the mandrel and the mandrel sleeve in each mandrel seat can be kept consistent, ensuring consistent airflow between the mandrel and the mandrel sleeve in each mandrel seat, thereby guaranteeing consistent molding quality of blow-molded products in the same batch. When the sealing performance between the T-shaped piston and the mounting hole decreases, it is only necessary to remove the corresponding mandrel seat from the turret for repair, which is convenient and quick. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the air blowing device in a traditional injection blowing machine.

[0016] Figure 2 yes Figure 1 A schematic diagram of a partial cross-sectional structure.

[0017] Figure 3 This is a schematic diagram of the air blowing device in the injection blowing machine of the present invention, which can realize quantitative air blowing.

[0018] Figure 4 yes Figure 3 Schematic diagram of the side wall structure of the transfer tower.

[0019] Figure 5 yes Figure 3 A cross-sectional view of the transfer tower.

[0020] Figure 6 yes Figure 3 A schematic diagram of the connection structure between the transfer tower and the mandrel base.

[0021] Figure 7 This is a schematic diagram of the connection structure between the mandrel holder, T-shaped piston, mandrel sleeve, and mandrel.

[0022] Figure 8 yes Figure 7 A schematic diagram of the connection structure between the T-shaped piston and the mandrel. Detailed Implementation

[0023] The technical solution of the present invention will be further described below with reference to the accompanying drawings and preferred embodiments.

[0024] like Figures 3-8As shown, the air blowing device in the injection blowing machine of the present invention, capable of achieving quantitative air blowing, includes: a turret 1, on which air passages 18 are provided, and each end of the air passage 18 needs to be sealed for blockage; the turret 1 is provided with three air holes 181 respectively connected to the three air passages 18; a normally closed solenoid valve is provided on the air hole 181; when the normally closed solenoid valve is energized, the air inlet opens and the air outlet is closed, allowing compressed air to enter the air passage 18 through the normally closed solenoid valve and the air hole 181 and flow and be pressurized; when the normally closed solenoid valve is de-energized, the air inlet is closed and the air outlet opens, allowing compressed air in the air passage 18 to flow and be pressurized through the air hole 181. 1. A normally closed solenoid valve is used for pressure relief. Several individually detachable mandrel seats 2 are sealed on the side wall of the turret 1. The connection structure between the mandrel seat 2 and the turret 1 is as follows: two positioning holes 21 are symmetrically arranged vertically on the rear side wall of the mandrel seat 2; countersunk holes 22 penetrating the front and rear side walls of the mandrel seat 2 are arranged around the mandrel seat 2; two rows of positioning pins 19 are symmetrically arranged vertically on the side wall of the turret 1; two rows of first threaded holes 10 are symmetrically arranged vertically on the side wall of the turret 1; the two positioning holes 21 on the mandrel seat 2 are respectively inserted into the two symmetrically arranged positioning pins 19; and the four countersunk holes 22 on the mandrel seat 2 are respectively connected to four… The first threaded holes 10 are aligned one by one. Countersunk bolts 221 are inserted into the countersunk holes 22. The countersunk bolts 221 are threadedly connected to the corresponding first threaded holes 10. The countersunk bolts 221 are embedded in the countersunk holes 22. A sealing groove is provided on the side wall of the mandrel seat 2 that abuts against the side wall of the turret 1. A flat sealing ring 23 is fitted in the sealing groove. The side wall of the turret 1 is sealed against the flat sealing ring 23. The mandrel seat 2 is provided with a mounting hole 24 that communicates with the air passage 18 and penetrates the front and rear side walls of the mandrel seat 2. The mounting hole 24 is coaxially connected with the sealing groove and its inner diameter is smaller than that of the sealing groove. A partition ring 241 is provided in the mounting hole 24. The mandrel seat 241 is provided with a blow hole 25 and a positioning screw hole that communicate with the mounting hole 24. The blow hole 25 and the positioning screw hole are located on the front and rear sides of the separator ring 241, respectively. Two positioning screw holes are symmetrically arranged on the upper and lower side walls of the mandrel seat 2. A positioning screw 26 is threaded into each of the two positioning screw holes. The positioning screw 26 has an inverted conical bottom 261. The inverted conical bottom 261 of the positioning screw 26 extends into the mounting hole 24. A locking nut 262 is threaded into the positioning screw 26. The locking nut 262 abuts against the mandrel seat 2. The locking nut 262 can strengthen the connection between the positioning screw 26 and the mandrel seat 2.

[0025] A T-shaped piston 3 is slidably and sealingly installed in the mounting hole 24 located behind the separator ring 241. An inclined wall 31 is provided on the front side wall of the large-diameter end of the T-shaped piston 3, which can abut against the inverted conical bottom 261 on the positioning screw 26. The abutment and cooperation between the inclined wall 31 and the inverted conical bottom 261 serves both a limiting function and prevents damage to the T-shaped piston 3 and the positioning screw 26 due to collision, thus reducing the limiting accuracy. The small-diameter section of the T-shaped piston 3 slides and seals with the separator ring 241. In this embodiment, the sliding seal between the T-shaped piston 3 and the mounting hole 24 and the separator ring 241 is achieved by the large-diameter and small-diameter ends of the T-shaped piston 3. A sealing ring is used to seal and fix a mandrel sleeve 4 in the mounting hole 24 located in front of the separator ring 241. In this embodiment, the sealing ring in the mounting hole 24 plays a sealing role between the mandrel sleeve 4 and the mounting hole 24. The mandrel sleeve 4 located in the mounting hole 24 does not interfere with the injection hole 25. Two limiting plates 27 are symmetrically arranged on the front side wall of the mandrel seat 2. Semicircular grooves are opened on the limiting plates 27. Limiting ring grooves are provided on the outer side wall of the mandrel sleeve 4. The two limiting plates 27 are engaged with the mandrel sleeve 4 through the cooperation between their semicircular grooves and the limiting ring grooves of the mandrel sleeve 4, thereby fixing the mandrel sleeve 4 to the mandrel seat 2. The two limiting plates 27 do not interfere with the injection hole 25. The mandrel sleeve 4 can be fixed to the mandrel base 2, and the countersunk hole 22 on the mandrel base 2 can be covered to ensure aesthetics. The front wall of the mandrel sleeve 4 is a wedge-shaped wall. The mandrel 5 is movably inserted in the mandrel sleeve 4. A sealing end 51 that can fit with the wedge-shaped wall is provided on the mandrel 5. The mandrel 5 is connected to the T-type piston 3. A star nut 6 is fixedly installed on the mandrel 5. A return spring 7 is provided between the star nut 6 and the mandrel sleeve 4. The connection structure between the T-type piston 3 and the mandrel 5 is as follows: a connecting hole 32 is provided in the T-type piston 3. A limit ring 321 is provided in the connecting hole 32. A connecting rod is movably inserted in the connecting hole 32 located behind the limit ring 321. Bolt 33, a connecting rod 34 is sealed through the connecting hole 32 located in front of the limiting ring 321. In this embodiment, the sealing ring in the connecting hole 32 plays a sealing role between the connecting rod 34 and the connecting hole 32. The connecting rod 34 has a second threaded hole 341 at both ends. After the connecting bolt 33 passes through the limiting ring 321, it is threadedly connected to the second threaded hole 341 at the rear end of the connecting rod 34. The connecting bolt 33 and the connecting rod 34 abut against the limiting ring 321. The mandrel 5 has an external thread, which is threadedly connected to the second threaded hole 341 at the front end of the connecting rod 34. The connecting rod 34 abuts against the star nut 6.

[0026] In use, compressed air is blown into the mounting hole 24 in the mandrel seat 2 through the air passage 18 on the turret 1, pushing the T-piston 3 forward. The inclined wall 31 on the T-piston 3 abuts against the inverted conical bottom 261 of the positioning screw 26. As the T-piston 3 moves forward, it pushes the mandrel 5 forward through the connecting rod 34. The sealing end 51 on the mandrel 5 separates from the wedge-shaped wall on the mandrel sleeve 4 to form an air outlet. Then, compressed air enters the mandrel sleeve 4 through the injection hole 25 on the mandrel seat 2 and is blown out from the air outlet. Because the T-piston 3 is limited by the positioning screw 26, and the mandrel 5 and the T-piston 3 are... Since the mandrel 5 is fixedly connected, the compressed air in the blow hole 25 cannot cause further displacement of the mandrel 5. The air outlet between the mandrel 5 and the mandrel sleeve 4 maintains a stable opening. With the compressed air flow rate remaining constant, the airflow blown out of the air outlet can remain constant. Thus, by adjusting the positioning screws 26 on each mandrel seat 2 to be consistent, the opening of the air outlet between the mandrel 5 and the mandrel sleeve 4 in each mandrel seat 2 can be kept consistent, ensuring that the airflow blown out between the mandrel 5 and the mandrel sleeve 4 in each mandrel seat 2 is consistent, thereby ensuring that the molding quality of blow-molded products in the same batch is consistent.

[0027] The sealing structure between the T-piston 3 and the mounting hole 24 of the mandrel seat 2 and the partition ring 241 is the key technology for the compressed air in the air passage 18 to push open the mandrel 5. However, during the repeated reciprocating motion of the T-piston 3, the sealing ring on the T-piston 3 is prone to wear, which reduces the sealing effect. The reduced sealing effect will cause the opening of the air outlet between the mandrel 5 and the mandrel sleeve 4 to be compromised, which requires the replacement of the sealing ring. In this case, it is only necessary to remove the corresponding mandrel seat 2 from the turret 1 for replacement. Conversely, as Figure 1 , Figure 2 The structure shown requires the entire mold core mounting plate 11 to be removed from the turret 1 for replacement. Therefore, the air blowing device in the injection blower of the present invention, which can realize quantitative air blowing, is simpler and more convenient to replace than the traditional air blowing device.

[0028] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of the present invention. Any modifications or equivalent substitutions that do not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. An air blowing device in an injection blowing machine capable of achieving quantitative air blowing, including: A turret, characterized by an air passage with vents, is characterized by: several individually detachable mandrel seats sealed on the side walls of the turret; mounting holes on the mandrel seats that communicate with the air passages and penetrate the front and rear side walls of the mandrel seats; a partition ring installed in the mounting holes; injection holes and positioning screw holes on the mandrel seats that communicate with the mounting holes; the injection holes and positioning screw holes being located on the front and rear sides of the partition ring, respectively; a positioning screw threaded into the positioning screw hole; a T-shaped piston slidably installed in the mounting hole located on the rear side of the partition ring, with the small-diameter section of the T-shaped piston slidably sealing against the partition ring; a mandrel sleeve sealed and fixed in the mounting hole located on the front side of the partition ring, the mandrel sleeve in the mounting hole not interfering with the injection holes; a mandrel movably passing through the mandrel sleeve, the mandrel sealingly fitting against the front side wall of the mandrel sleeve; the mandrel being connected to the T-shaped piston; a star nut fixedly installed on the mandrel; and a return spring installed between the star nut and the mandrel sleeve.

2. The air blowing device in the injection blowing machine according to claim 1, characterized in that: The front wall of the mandrel sleeve is a wedge-shaped wall, and a sealing end is provided on the mandrel that can fit against the wedge-shaped wall.

3. The air blowing device in the injection blowing machine according to claim 1, characterized in that: The connection structure between the mandrel base and the turret is as follows: two positioning holes are symmetrically arranged on the rear side wall of the mandrel base, countersunk holes penetrating the front and rear side walls of the mandrel base are arranged around the mandrel base, two rows of positioning pins are symmetrically arranged on the side wall of the turret, and two rows of first threaded holes are symmetrically arranged on the side wall of the turret. The two positioning holes on the mandrel base are respectively inserted into the two symmetrically arranged positioning pins. The four countersunk holes on the mandrel base are respectively aligned with the four first threaded holes. Countersunk bolts are inserted in the countersunk holes and are threadedly connected to the corresponding first threaded holes. The countersunk bolts are submerged in the countersunk holes.

4. The air blowing device in the injection blowing machine according to claim 3, characterized in that: Two limiting plates are symmetrically arranged on the front side wall of the mandrel holder, with semi-circular grooves on the limiting plates and a limiting ring groove on the outer side wall of the mandrel sleeve. The two limiting plates are engaged with the mandrel sleeve through the cooperation between their semi-circular grooves and the limiting ring groove of the mandrel sleeve.

5. The air blowing device in the injection blowing machine according to claim 1, characterized in that: The connection structure between the T-type piston and the mandrel is as follows: a connecting hole is provided in the T-type piston, a limit ring is provided in the connecting hole, a connecting bolt is movably inserted in the connecting hole located behind the limit ring, a connecting rod is sealed and inserted in the connecting hole located in front of the limit ring, a second threaded hole is provided at both ends of the connecting rod, the connecting bolt passes through the limit ring and is threadedly connected to the second threaded hole at the rear end of the connecting rod, both the connecting bolt and the connecting rod abut against the limit ring, an external thread is provided on the mandrel, the external thread on the mandrel is threadedly connected to the second threaded hole at the front end of the connecting rod, and the connecting rod abuts against the star nut.

6. The air blowing device in the injection blowing machine according to claim 1, characterized in that: The positioning screw has an inverted conical bottom that extends into the mounting hole. The front side wall of the large-diameter end of the T-type piston has an inclined wall that can fit against the inverted conical bottom on the positioning screw.

7. The air blowing device in the injection blowing machine according to claim 1, characterized in that: A locking nut is threaded onto the positioning screw, and the locking nut abuts against the mandrel seat.

8. The air blowing device in the injection blowing machine according to claim 1, 6 or 7, characterized in that: Two positioning screw holes are symmetrically arranged on the upper and lower side walls of the mandrel holder, and positioning screws are threaded into both positioning screw holes.

9. The air blowing device in the injection blowing machine according to claim 1, characterized in that: A sealing groove is provided on the side wall that is in contact with the mandrel seat and the turret side wall. The groove is coaxially connected to the mounting hole and has an inner diameter larger than the mounting hole. A flat sealing ring is inserted in the sealing groove, and the turret side wall seals against the flat sealing ring.

10. The air blowing device in the injection blowing machine according to claim 1, characterized in that: A normally closed solenoid valve is installed on the air vent.

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