Blowing device capable of realizing quantitative blowing in injection blow molding machine

Abstract

The invention discloses an air blowing device capable of realizing quantitative air blowing in an injection blow molding machine, which comprises a rotating tower, a plurality of core rod seats arranged on the side wall of the rotating tower in a sealing manner, mounting holes formed in the core rod seats, separation rings arranged in the mounting holes, injection blow holes formed in the core rod seats and communicated with the mounting holes, and positioning screw holes formed in the core rod seats, a positioning screw is in threaded connection with the interior of the positioning screw hole, a T-shaped piston is arranged in the mounting hole in a sealed and sliding mode, the small-diameter section of the T-shaped piston is in sliding seal with the separation ring, a core rod sleeve is fixedly arranged in the mounting hole in a sealed mode, a core rod movably penetrates through the core rod sleeve, the core rod is attached to the front side wall of the core rod sleeve in a sealed mode, and the core rod is connected with the T-shaped piston. A star nut is fixedly arranged on the core rod, and a reset spring is arranged between the star nut and the core rod sleeve. According to the invention, the opening degree of the air outlet between the core rod and the core rod sleeve in each core rod seat can be controlled to be consistent by adjusting the positioning screw, so that the molding quality of blow molding products in the same batch is consistent.

Description

Technical Field

[0001] The invention relates to the field of injection-blowing machines, in particular to an air blowing device capable of achieving quantitative air blowing in an injection-blowing machine. Background Art

[0002] The blowing device in the injection blow molding machine is the core component of the product blow molding. The blowing devices in the injection blow molding machines currently on the market are as follows: Figure 1 As shown, it includes: a turret 1, a core mounting plate 11 is provided on the side wall of the turret 1, a piston 111 is sealingly and slidingly provided in the core mounting plate 11, a mounting seat 12 is provided on the core mounting plate 11, a core rod body 13 is fixed in the mounting seat 12, a core rod head 14 is movably inserted in the core rod body 13, a positioning nut 15 is provided on the core rod head 14, a spring 16 is provided between the positioning nut 15 and the core rod body 13, and a push plate 17 is provided between the piston 111 and the core rod head 14. The compressed air passes through the inside of the turret 1, causing the piston 111 to push the core rod head 14 forward through the push plate 17. The core rod head 14 overcomes the elastic force of the spring 16 and moves forward, so that the core rod head 14 and the core rod body 13 are opened. At this time, the size of the air outlet between the core rod head 14 and the core rod body 13 is determined by the stroke of the piston 111, and then the compressed air enters the core rod body 13 through the gas channel in the mold core mounting plate 11, and then blows out from the air outlet between the core rod head 14 and the core rod body 13. However, during this process, the compressed air will also act on the core rod head 14 to further push the core rod head 14. Since the core rod head 14, the push plate 17 and the piston 111 are only abutment structures rather than fixed connection structures, when the core rod head 14 is further pushed by the compressed air, the core rod head 14 is no longer affected by the piston 111 and the push plate 17 and will continue to move forward. The air outlet between the core rod head 14 and the core rod body 13 will increase. However, due to the difference in the flow rate of the compressed air being blown or the difference in the elastic force of the spring 16, the size of the air outlet between each group of core rod bodies 13 and the core rod head 14 cannot be controlled. This results in different blowing volumes between different groups of core rod bodies 13 and the core rod head 14, and ultimately leads to different molding quality of the same batch of blow-molded products. Summary of the Invention

[0003] The purpose of the present invention is to provide a blowing device that can achieve quantitative blowing in an injection blow molding machine by keeping the opening of the air outlet between the core rod and the core rod sleeve in each core rod seat consistent, thereby ensuring consistent molding quality of blow-molded products in the same batch.

[0004] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a blowing device capable of realizing quantitative blowing in an injection-blowing machine, comprising: a turret, an air duct with air holes is provided on the turret, a plurality of independently detachable mandrel seats are sealed on the side walls of the turret, a mounting hole connected to the air duct and passing through the front and rear side walls of the mandrel seat is provided on the mandrel seat, a separator ring is provided in the mounting hole, an injection hole and a positioning screw hole connected to the mounting hole are provided on the mandrel seat, and the injection hole and the positioning screw hole are respectively located on the front and rear sides of the separator ring. On the side, a positioning screw is threadedly connected in the positioning screw hole, a T-type piston is sealingly and slidingly arranged in the mounting hole located on the rear side of the separating ring, the small diameter section of the T-type piston is slidingly sealed with the separating ring, a core rod sleeve is sealingly and fixedly arranged in the mounting hole located on the front side of the separating ring, the core rod sleeve located in the mounting hole does not interfere with the injection and blowing hole, a core rod is movably inserted in the core rod sleeve, the core rod is sealed and fitted with the front side wall of the core rod sleeve, the core rod is connected to the T-type piston, a star nut is fixedly arranged on the core rod, and a reset spring is arranged between the star nut and the core rod sleeve.

[0005] Furthermore, the aforementioned injection-blowing machine can provide a blowing device capable of achieving quantitative blowing, wherein the front side wall of the core rod sleeve is a wedge-shaped wall, and a sealing end capable of fitting with the wedge-shaped wall is provided on the core rod.

[0006] Furthermore, the aforementioned injection-blowing machine is provided with an air blowing device capable of realizing quantitative air blowing, wherein the connection structure between the mandrel seat and the turret is as follows: two positioning holes are symmetrically arranged 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 on the side wall of the turret, two rows of first threaded holes are symmetrically arranged 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 passed through the countersunk holes, the countersunk bolts are threadedly connected to the corresponding first threaded holes, and the countersunk bolts are immersed in the countersunk holes.

[0007] Furthermore, the aforementioned injection-blowing machine is capable of realizing a blowing device for quantitative blowing, wherein two limiting plates are symmetrically arranged on the upper and lower sides of the front side wall of the core rod seat, a semicircular groove is opened on the limiting plate, and a limiting ring groove is provided on the outer side wall of the core rod sleeve, and the two limiting plates are engaged with the core rod sleeve through the cooperation between their own semicircular grooves and the limiting ring groove of the core rod sleeve.

[0008] Furthermore, the aforementioned injection-blowing machine is capable of realizing a blowing device for quantitative blowing, wherein the connection structure between the T-type piston and the core rod is as follows: a connecting hole is provided in the T-type piston, a limiting ring is provided in the connecting hole, a connecting bolt is movably passed through the connecting hole located on the rear side of the limiting ring, a connecting rod is sealingly passed through the connecting hole located on the front side of the limiting ring, second threaded holes are provided at both front and rear ends of the connecting rod, the connecting bolt passes through the limiting ring and is threadedly connected to the second threaded hole at the rear end of the connecting rod, the connecting bolt and the connecting rod both rest on the limiting ring, an external thread is provided on the core rod, the external thread on the core rod is threadedly connected to the second threaded hole at the front end of the connecting rod, and the connecting rod rests on the star nut.

[0009] Furthermore, the aforementioned injection-blowing machine is capable of realizing a blowing device for quantitative 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 with the inverted conical bottom on the positioning screw.

[0010] Furthermore, the aforementioned injection-blowing machine can provide a blowing device capable of achieving quantitative blowing, wherein a locking nut is threadedly connected to the positioning screw, and the locking nut rests on the core rod seat.

[0011] Furthermore, the aforementioned injection-blowing machine can realize a blowing device for quantitative blowing, wherein two positioning screw holes are symmetrically provided on the upper and lower side walls of the core rod seat, and positioning screws are threadedly connected in the two positioning screw holes.

[0012] Furthermore, the aforementioned injection-blowing machine is capable of realizing a blowing device for quantitative blowing, wherein a sealing groove is provided on the side wall where the core rod seat is in contact with the turret side wall, which is coaxially connected to the mounting hole and has an inner diameter larger than the mounting hole. A flat sealing ring is clamped in the sealing groove, and the turret side wall is sealed against the flat sealing ring.

[0013] Furthermore, the aforementioned injection-blow molding machine can provide a blowing device capable of achieving quantitative blowing, wherein a normally closed electromagnetic valve is provided on the air hole.

[0014] The advantages of the present invention are that the T-type piston is limited by the positioning screw, and the core rod is fixedly connected to the T-type piston. In this way, when the compressed air pushes the T-type piston and the core rod to move forward, the stroke of the T-type piston is limited by the positioning screw, and the compressed air in the later injection hole acts on the core rod and cannot make the core rod continue to move. In this way, the opening of the air outlet between the core rod and the core rod sleeve can be controlled, so it is only necessary to adjust the positioning screws on each core rod seat to make the opening of the air outlet between the core rod and the core rod sleeve in each core rod seat consistent, so that the air flow blown out between the core rod and the core rod sleeve in each core rod seat is consistent, thereby ensuring the consistent molding quality of the same batch of blow-molded products; when the sealing performance between the T-type piston and the mounting hole is reduced, it is only necessary to remove the corresponding core rod seat from the turret for maintenance, which is convenient and quick. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural diagram of the blowing device in a traditional injection-blow machine.

[0016] Figure 2 yes Figure 1 Schematic diagram of the local cross-sectional structure.

[0017] Figure 3 It is a structural schematic diagram of the blowing device capable of achieving quantitative blowing in the injection-blowing machine described in the present invention.

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

[0019] Figure 5 yes Figure 3 Schematic diagram of the cross-sectional structure of the transfer tower.

[0020] Figure 6 yes Figure 3 Schematic diagram of the connection structure between the transfer tower and the core rod holder.

[0021] Figure 7 It is a schematic diagram of the connection structure between the core rod seat, T-type piston, core rod sleeve and core rod.

[0022] Figure 8 yes Figure 7 Schematic diagram of the connection structure between the middle T-shaped piston and the core rod. DETAILED DESCRIPTION

[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 to 8As shown, the blowing device capable of achieving quantitative blowing in the injection-blowing machine of the present invention comprises: a turret 1, an air passage 18 is provided on the turret 1, and a plug is provided at the end of each air passage 18 for blocking, three air holes 181 are provided on the turret 1, which are respectively connected to the three air passages 18, and a normally closed solenoid valve is provided on the air hole 181. When the normally closed solenoid valve is energized, the air inlet is opened and the air outlet is closed, and compressed air can enter the air passage 18 through the normally closed solenoid valve and the air hole 181 to flow and be pressurized. When the normally closed solenoid valve is de-energized, the air inlet is closed and the air outlet is opened, and the compressed air in the air passage 18 can pass through the air hole 18 1 and a normally closed solenoid valve for pressure relief. Several separately detachable mandrel seats 2 are sealed on the side walls 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 provided on the rear side wall of the mandrel seat 2, and countersunk holes 22 are provided around the mandrel seat 2 and pass through the front and rear side walls of the mandrel seat 2. Two rows of positioning pins 19 are symmetrically provided on the side wall of the turret 1, and two rows of first threaded holes 10 are symmetrically provided on the side wall of the turret 1. The two positioning holes 21 on the mandrel seat 2 are respectively inserted into the two positioning pins 19 symmetrically provided in the upper and lower directions. The four countersunk holes 22 on the mandrel seat 2 are respectively connected to the four The first threaded holes 10 are aligned one by one, and countersunk bolts 221 are passed through the countersunk holes 22. The countersunk bolts 221 are threadedly connected to the corresponding first threaded holes 10, and the countersunk bolts 221 are immersed in the countersunk holes 22. A sealing groove is provided on the side wall of the mandrel seat 2 that is in contact with the side wall of the turret 1. A flat sealing ring 23 is clamped in the sealing groove, and the side wall of the turret 1 is sealed against the flat sealing ring 23. A mounting hole 24 is provided on the mandrel seat 2 that is connected to the airway 18 and passes through the front and rear side walls of the mandrel seat 2. The mounting hole 24 is coaxially connected to the sealing groove and has an inner diameter smaller than the sealing groove. A separator ring 241 is provided in the mounting hole 24. An injection hole 25 and a positioning screw hole connected to the mounting hole 24 are provided on it. The injection hole 25 and the positioning screw hole are respectively located on the front and rear sides of the separating ring 241. Two positioning screw holes are symmetrically provided on the upper and lower side walls of the core rod seat 2. A positioning screw 26 is threadedly connected in the two positioning screw holes. An inverted conical bottom 261 is provided on the positioning screw 26. The inverted conical bottom 261 of the positioning screw 26 extends into the mounting hole 24. A locking nut 262 is threadedly connected to the positioning screw 26. The locking nut 262 rests on the core rod seat 2. The locking nut 262 can strengthen the connection strength between the positioning screw 26 and the core rod seat 2.

[0025] A T-shaped piston 3 is sealingly and slidingly arranged in the mounting hole 24 located at the rear side of the separating ring 241. A slanted wall 31 that can fit with the inverted conical bottom 261 on the positioning screw 26 is provided on the front side wall of the large diameter end of the T-shaped piston 3. The slanted wall 31 and the inverted conical bottom 261 fit together to play a limiting role and prevent the T-shaped piston 3 and the positioning screw 26 from being damaged due to collision, which leads to a reduction in the limiting accuracy. The small diameter section of the T-shaped piston 3 is slidingly sealed with the separating ring 241. In this embodiment, the sliding sealing between the T-shaped piston 3 and the mounting hole 24 and the separating ring 241 is installed on the large diameter end and the small diameter end of the T-shaped piston 3. The sealing ring is sealed and fixed with a core rod sleeve 4 in the mounting hole 24 located on the front side of the separating ring 241. In this embodiment, the sealing ring arranged in the mounting hole 24 plays a sealing role between the core rod sleeve 4 and the mounting hole 24. The core rod sleeve 4 located in the mounting hole 24 does not interfere with the injection and blowing hole 25. Two limiting plates 27 are symmetrically arranged on the front side wall of the core rod seat 2. A semicircular groove is opened on the limiting plate 27, and a limiting ring groove is provided on the outer side wall of the core rod sleeve 4. The two limiting plates 27 are engaged with the core rod sleeve 4 through the cooperation between their own semicircular grooves and the limiting ring grooves of the core rod sleeve 4, thereby fixing the core rod sleeve 4 on the core rod seat 2. The two limiting plates 27 do not The core rod sleeve 4 can only be fixed on the core rod seat 2, and the countersunk hole 22 on the core rod seat 2 can be covered to ensure the appearance. The front side wall of the core rod sleeve 4 is a wedge-shaped wall, and a core rod 5 is movably inserted in the core rod sleeve 4. A sealing end 51 that can fit with the wedge-shaped wall is provided on the core rod 5. The core rod 5 is connected to the T-type piston 3, and a star nut 6 is fixed on the core rod 5. A return spring 7 is provided between the star nut 6 and the core rod sleeve 4. The connection structure between the T-type piston 3 and the core rod 5 is as follows: a connecting hole 32 is provided in the T-type piston 3, a limiting ring 321 is provided in the connecting hole 32, and a connecting ring 321 is movably inserted in the connecting hole 32 located at the rear side of the limiting ring 321 The bolt 33 is sealed and passed through a connecting rod 34 in the connecting hole 32 located on the front side of the limiting ring 321. In this embodiment, the sealing ring provided in the connecting hole 32 serves as a seal between the connecting rod 34 and the connecting hole 32. Second threaded holes 341 are provided at the front and rear ends of the connecting rod 34. The connecting bolt 33 passes through the limiting ring 321 and 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 both rest on the limiting ring 321. An external thread is provided on the core rod 5. The external thread on the core rod 5 is threadedly connected to the second threaded hole 341 at the front end of the connecting rod 34. The connecting rod 34 rests on the star nut 6.

[0026] When 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 to push the T-type piston 3 forward, and the inclined wall 31 on the T-type piston 3 will abut against the inverted conical bottom 261 of the positioning screw 26. When the T-type piston 3 moves forward, it can push the mandrel 5 forward through the connecting rod 34, and the sealing end 51 on the mandrel 5 is separated from the wedge-shaped wall on the mandrel sleeve 4 to form an air outlet. Then the compressed air enters the mandrel sleeve 4 from the injection hole 25 on the mandrel seat 2 and is blown out from the air outlet. Since the T-type piston 3 is limited by the positioning screw 26, and the mandrel 5 and the T-type piston 3 are The two ends of the mandrel sleeve 4 are fixedly connected, so the compressed air in the injection hole 25 acts on the mandrel 5 and cannot cause the mandrel 5 to move further. The air outlet between the mandrel 5 and the mandrel sleeve 4 maintains a stable opening. When the compressed air flow rate remains unchanged, the air flow blown out from the air outlet can be maintained unchanged. In this way, it is only necessary to adjust the adjusting screw 26 on each mandrel seat 2 to make the opening of the air outlet between the mandrel 5 and the mandrel sleeve 4 in each mandrel seat 2 consistent, so that the air flow blown out between the mandrel 5 and the mandrel sleeve 4 in each mandrel seat 2 is consistent, thereby ensuring the consistent molding quality of the blow-molded products of the same batch.

[0027] The sealing structure between the T-type piston 3 and the mounting hole 24 of the mandrel holder 2 and the separating ring 241 is the key technology for the compressed air in the air passage 18 to push the mandrel 5 open. However, the T-type piston 3 is prone to wear of the sealing ring on the T-type piston 3 during repeated reciprocating motion, thereby reducing 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 unable to be guaranteed, which requires replacing the sealing ring. At this time, it is only necessary to remove the corresponding mandrel holder 2 from the turret 1 for replacement. On the contrary, if Figure 1 、 Figure 2 The structure shown requires the entire core mounting plate 11 to be disassembled from the turret 1 for replacement, so the blowing device capable of achieving quantitative blowing in the injection blow molding machine of the present invention is simpler and more convenient to replace than the traditional 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, ordinary technicians in the field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be covered by the scope of protection of the claims of the present invention.

Claims

1. The blowing device capable of achieving quantitative blowing in the injection-blow machine includes: The turret is provided with an air duct with air holes, which is characterized in that: a plurality of separately detachable core rod seats are sealed on the side walls of the turret, a mounting hole connected with the air duct and passing through the front and rear side walls of the core rod seat is provided on the core rod seat, a separating ring is provided in the mounting hole, an injection hole and a positioning screw hole connected with the mounting hole are provided on the core rod seat, the injection hole and the positioning screw hole are respectively located on the front and rear sides of the separating ring, a positioning screw is threadedly connected in the positioning screw hole, a T-type piston is sealingly and slidingly provided in the mounting hole located on the rear side of the separating ring, the small diameter section of the T-type piston is slidingly sealed with the separating ring, a core rod sleeve is sealingly and fixedly provided in the mounting hole located on the front side of the separating ring, the core rod sleeve located in the mounting hole does not interfere with the injection hole, a core rod is movably inserted in the core rod sleeve, the core rod is sealed and fitted with the front side wall of the core rod sleeve, the core rod is connected to the T-type piston, a star nut is fixedly provided on the core rod, and a return spring is provided between the star nut and the core rod sleeve.

2. The blowing device capable of achieving quantitative blowing in the injection-blow molding machine according to claim 1, characterized in that: The front side wall of the core rod sleeve is a wedge-shaped wall, and a sealing end capable of fitting with the wedge-shaped wall is provided on the core rod.

3. The blowing device capable of achieving quantitative blowing in the injection-blow molding machine according to claim 1, characterized in that: The connection structure between the mandrel seat and the turret is as follows: two positioning holes are symmetrically arranged on the rear side wall of the mandrel seat, countersunk holes are arranged around the mandrel seat and pass through the front and rear side walls of the mandrel seat, 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 seat are respectively inserted into the two symmetrically arranged positioning pins, and the four countersunk holes on the mandrel seat are respectively aligned with the four first threaded holes. Countersunk bolts are passed through the countersunk holes, and the countersunk bolts are threadedly connected to the corresponding first threaded holes, and the countersunk bolts are immersed in the countersunk holes.

4. The blowing device capable of achieving quantitative blowing in the injection-blow molding machine according to claim 3, characterized in that: Two limiting plates are symmetrically arranged on the front side wall of the mandrel seat, with semicircular grooves on the limiting plates and limiting ring grooves on the outer side wall of the mandrel sleeve. The two limiting plates are engaged with the mandrel sleeve through the cooperation between their own semicircular grooves and the limiting ring grooves of the mandrel sleeve.

5. The blowing device capable of achieving quantitative blowing in the injection-blow molding machine according to claim 1, characterized in that: The connection structure between the T-type piston and the core rod is as follows: a connecting hole is provided in the T-type piston, a limiting ring is provided in the connecting hole, a connecting bolt is movably passed through the connecting hole located on the rear side of the limiting ring, a connecting rod is sealingly passed through the connecting hole located on the front side of the limiting ring, second threaded holes are provided at the front and rear ends of the connecting rod, the connecting bolt passes through the limiting ring and is threadedly connected to the second threaded hole at the rear end of the connecting rod, the connecting bolt and the connecting rod both rest on the limiting ring, an external thread is provided on the core rod, the external thread on the core rod is threadedly connected to the second threaded hole at the front end of the connecting rod, and the connecting rod rests on the star nut.

6. The blowing device capable of achieving quantitative blowing in the injection-blow molding machine according to claim 1, characterized in that: The positioning screw is provided with an inverted conical bottom which extends into the mounting hole. The front side wall of the large diameter end of the T-shaped piston is provided with an inclined wall which can fit with the inverted conical bottom on the positioning screw.

7. The blowing device capable of achieving quantitative blowing in the injection-blow molding machine according to claim 1, characterized in that: A locking nut is threadedly connected to the positioning screw, and the locking nut rests on the core rod seat.

8. The blowing device capable of achieving quantitative blowing in the injection-blow molding 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 core rod seat, and positioning screws are threadedly connected in the two positioning screw holes.

9. The blowing device capable of achieving quantitative blowing in the injection-blow molding machine according to claim 1, characterized in that: A sealing groove is provided on the side wall where the core rod seat abuts against the turret side wall. The sealing groove is coaxially connected to the mounting hole and has an inner diameter larger than the mounting hole. A flat sealing ring is clamped in the sealing groove, and the turret side wall is sealed against the flat sealing ring.

10. The blowing device capable of achieving quantitative blowing in the injection-blow molding machine according to claim 1, characterized in that: A normally closed electromagnetic valve is provided on the air hole.

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