Air guiding structure and air guiding method of an injection blow hollow molding machine

Abstract

The present application relates to an air guiding structure and an air guiding method for an injection blow hollow molding machine, which includes a table board. A rotating shaft capable of lifting and rotating after rising is provided on the table board. A rotating disk is provided at the top of the rotating shaft. A jet pipe capable of discharging air is provided at the top of the table board. An air vent passage is provided inside the rotating disk. The jet pipe can be inserted into the air vent passage. A number of directional through holes are formed on the side wall of the air vent passage. A pushing piston is provided in each directional through hole. A push plate is provided at one end of the pushing piston away from the air vent passage. A guiding hole is also formed inside the tower body. A holding piston capable of sliding inside the guiding hole is provided inside the guiding hole. An air flow passage communicating with the air vent passage is formed at the top end of the side wall of the guiding hole. The jet pipe is used for jetting air into the air vent passage so that the holding piston moves to clamp the push plate. The present application can improve the processing efficiency.

Description

Technical Field

[0001] This application relates to the technical field of injection blow molding machines, and particularly to a gas guiding structure and a gas guiding method for an injection blow hollow molding machine. Background Art

[0002] An injection blow hollow molding machine is an automated blow molding device, which is widely used in the blow molding of cosmetic bottles, beverage bottles, and medicine bottles.

[0003] Refer to Figure 1 , currently there is disclosed a mandrel 1 of an injection blow hollow molding machine, which includes a mandrel body 11, a mandrel rod 17, and a spring 14. A guiding through hole 12 is opened in the mandrel body 11. One end of the mandrel rod 17 is inserted into the guiding through hole 12, and the other end of the mandrel rod 17 passes through the guiding through hole 12 and is fixedly connected with a mandrel head 13. A cylindrical installation groove 15 is also opened in the mandrel body 11 near one end of the mandrel head 13. A spring 14 is installed in the installation groove 15. One end of the spring 14 is fixed in the installation groove 15, and the other end of the spring 14 is fixed on the mandrel head 13. An air pipe 16 is also opened in the mandrel rod 17. One end of the air pipe 16 is communicated with the guiding through hole 12, and the other end of the air pipe 16 is communicated with the installation groove 15. First, a bottle is sleeved on the outer side wall of the mandrel body 11 and one end of the mandrel body 11 near the mandrel head 13 is covered. At this time, air is injected into the air pipe 16, and the gas will reach the installation groove 15 from the air pipe 16. Then the gas will push the mandrel body 11 out and flow into the bottle for blow molding of the bottle. When the injection of air into the air pipe 16 stops, the mandrel head 13 will reset under the action of the spring 14.

[0004] Regarding the above related solutions, the inventor believes that there are the following defects: Stopping the injection of air into the air pipe will cause the mandrel head to reset, and the reset of the mandrel head will disconnect the communication port between the air pipe and the bottle, so that some gas in the bottle cannot be discharged, resulting in a relatively high air pressure in the bottle, and the relatively high air pressure will affect the subsequent removal of the bottle. Summary of the Invention

[0005] In order to reduce the air pressure in the bottle, this application provides a gas guiding structure and a gas guiding method for an injection blow hollow molding machine.

[0006] In the first aspect, the above-mentioned first invention object of the present invention is achieved through the following technical solutions:

[0007] An air guiding structure of a injection blow hollow molding machine, comprising a table board, on which there is a rotating shaft capable of lifting and rotating after rising. A rotating disk is provided at the top of the rotating shaft. A jet pipe capable of discharging gas is provided at the top of the table board. An air passage is provided in the rotating disk. The jet pipe can be inserted into the air passage. A number of directional through holes are opened on the side wall of the air passage. A pushing piston is provided in each of the directional through holes. A push plate is provided at one end of the pushing piston away from the air passage. A guiding hole is also opened in the tower body. A holding piston capable of sliding in the guiding hole is provided in the guiding hole. An air flow passage communicating with the air passage is opened at the top end of the side wall of the guiding hole. The jet pipe is used for jetting air into the air passage so that the holding piston moves to clamp the push plate.

[0008] By adopting the above technical solution, after the jet pipe injects air into the air passage, the gas will reach the directional through holes and push the pushing piston to make the push plate move. The movement of the push plate will generate an external force on the mandrel, causing the opening of the mandrel to open. The gas in the air passage will also enter the upper cavity in the guiding hole through the air flow passage. The gas will generate a thrust on the top of the holding piston. The holding piston will be pushed to move downward, and then the holding piston can clamp the push plate. The holding piston clamping the push plate can ensure that when the rotating disk rises, the push plate will not reset, and the push plate can still generate an external force on the mandrel so that the opening on the mandrel will not be closed due to the action of the spring, and then part of the gas in the bottle can flow back and be discharged through the opening, thereby reducing the air pressure in the bottle.

[0009] Preferably, a top rod is provided at the top of the table board at the pointing position of the guiding hole. A concave pit is also provided at one end of the bottom of the rotating disk corresponding to the guiding hole. The bottom end of the holding piston is located in the concave pit. The diameter of the top rod is larger than the diameter of the guiding hole.

[0010] By adopting the above technical solution, when the rotating disk descends, the top rod cannot be inserted into the guiding hole. The top of the top rod will abut against the bottom of the concave pit. A part of the holding piston located in the concave pit will be pushed into the guiding hole. The moving distance of the holding piston is the distance between the bottom of the holding piston and the bottom of the concave pit, which to a certain extent avoids excessive displacement of the holding piston when it is jacked up by the top rod, resulting in structural damage of the holding piston.

[0011] Preferably, an annular adjusting pad is sleeved on the rotating shaft at the top of the table board. The distance from the upper end face of the adjusting pad to the lower end face of the rotating disk is equal to the distance from the top of the top rod to the bottom surface of the concave pit.

[0012] By adopting the above technical solution, the distance from the upper end surface of the adjustment pad to the lower end surface of the rotating disk is equal to the distance from the top of the push rod to the bottom surface of the pit, which can ensure that the push rod does not damage the structure of the pit after the rotating disk descends.

[0013] Preferably, the adjustment pad is used to cushion the descending of the rotating disk, and the adjustment pad is detachable.

[0014] By adopting the above technical solution, the rigid impact between the rotating disk and the structure on the table panel after the rotating disk descends is avoided to a certain extent, and the damage to the structure after long-term processing is relatively avoided. The adjustment pad can be disassembled to replace other adjustment pads of different heights.

[0015] Preferably, a circular limiting protrusion is provided in the guide hole, and the limiting protrusion is used to prevent the retaining piston from sliding out from the bottom end of the guide hole.

[0016] By adopting the above technical solution, the annular limiting protrusion can ensure that the retaining piston will not slide out of the guide hole without affecting the normal sliding of the retaining piston. That is, the side wall of the retaining piston and the side wall of the guide hole do not need to be designed to be too tight. The sliding property of the retaining piston needs to be guaranteed in the matching structural design of the retaining piston and the guide hole. Better sliding property can avoid the situation where the gas pushes the retaining piston to move with difficulty to a certain extent.

[0017] Preferably, each of the directional through holes is provided with a piston sleeve matched with the pushing piston, and the pushing piston is mounted on the piston sleeve.

[0018] By adopting the above technical solution, the piston sleeve can ensure the cleanliness of the piston rod and can also guide the moving direction of the pushing piston.

[0019] Preferably, the push plate is provided with an upward first inclined surface at one end close to the retaining piston, and a downward second inclined surface is provided on the side wall of the retaining piston, and the second inclined surface is used to abut against the first inclined surface to move the push plate.

[0020] By adopting the above technical solution, when the push plate is not completely pushed to the specified position by the push piston, after the piston is pushed by the gas, the second inclined surface will move against the first inclined surface, thereby pushing the push plate into place.

[0021] Preferably, a guide groove is formed on the tower body at one end of the pushing piston away from the ventilation channel, and the push plate is installed in the guide groove.

[0022] By adopting the above technical solution, the guide groove can guide the moving direction of the push plate, thereby avoiding as much as possible the deviation of the push plate that makes it difficult to push the core rod to move, thereby making it difficult to open the opening on the core rod.

[0023] Preferably, the top end of the guiding hole communicates with the outside, and a holding pressing plate covering the guiding hole is detachably mounted on the rotating disk.

[0024] By adopting the above technical solution, the holding pressing plate can be removed to add a sliding agent into the guiding hole or clean foreign matters in the guiding hole at any time, so as to ensure that the holding piston can slide normally in the guiding hole.

[0025] Secondly, the second invention object of the present invention is achieved by the following technical solution:

[0026] An air guiding structure of an injection blow hollow molding machine, and its air guiding method includes the following steps:

[0027] S1. First, after the rotating disk descends in place, the jet air duct will communicate with the ventilation passage. The gas ejected from the jet air duct will first enter the ventilation passage, and then the gas will enter the directional through hole to push the pushing piston to move, thereby driving the push plate to move; the gas ejected from the jet air duct into the ventilation passage will also reach the guiding hole, and the gas will push the holding piston to move, so that the holding piston will hold the push plate;

[0028] S2. After the rotating disk rises, the jet air duct will be separated from the ventilation passage, the ventilation passage will deflate, and the holding piston will continue to hold the push plate in a stuck state;

[0029] S3. After the rotating disk rotates and descends to a specified position again, the ejector rod will be inserted into the guiding hole to push the holding piston to reset, and the push plate will be reset due to an external force.

[0030] By adopting the above technical solution, after the rotating disk descends in place, the jet air duct will communicate with the ventilation passage and jet air into the ventilation passage. The gas will reach the directional through hole from the ventilation passage and push the pushing piston in the directional through hole to move. The movement of the pushing piston will drive the push plate to move; the gas in the ventilation passage will also reach the guiding hole, the gas will enter the upper cavity of the guiding hole and then push the holding piston. After the holding piston is pushed in place by the gas, it will hold the push plate; after the push plate is held, the rotating disk will rise and then rotate. When the rotating disk descends again after rotating in place, the ejector rod will be inserted into the guiding hole to reset the holding piston, and the reset of the holding piston will cause the push plate to reset.

[0031] In summary, the present invention includes at least one of the following beneficial technical effects:

[0032] 1. After the jet duct injects gas into the ventilation channel, the gas will reach the directional through-hole and push the piston to move the push plate. The movement of the push plate will generate an external force on the mandrel, causing the opening of the mandrel to open. The gas in the ventilation channel will also enter the upper cavity in the guide hole through the air flow channel. The gas will generate a thrust on the top of the holding piston, and the holding piston will be pushed down. Then the holding piston can hold the push plate. The holding piston holding the push plate can ensure that when the rotating disk rises, the push plate will not reset, and the push plate can still generate an external force on the mandrel, so that the opening on the mandrel will not be closed due to the action of the spring. Subsequently, part of the gas in the bottle can flow back and be discharged through the opening, thereby reducing the air pressure in the bottle.

[0033] 2. When the rotating disk descends, the top of the ejector rod will abut against the bottom of the pit. A part of the holding piston located in the pit will be pushed into the guide hole. The moving distance of the holding piston is the distance between the bottom of the holding piston and the bottom of the pit, which to a certain extent avoids excessive displacement when the holding piston is lifted by the ejector rod, resulting in structural damage to the holding piston. The setting of the adjusting pad also protects the various structures on the table board to a certain extent. Description of the Drawings

[0034] Figure 1 is a schematic structural diagram of the mandrel;

[0035] Figure 2 is a schematic overall structural diagram of the air guiding structure of an injection blow hollow molding machine according to an embodiment of the present application;

[0036] Figure 3 is a cross-sectional view for showing the internal structure of the rotating disk;

[0037] Figure 4 is a cross-sectional view for showing the internal structure of the guide hole;

[0038] Figure 5 is Figure 4 an enlarged view of part A in

[0039] Reference numerals in the drawings: 1, mandrel; 11, core body; 12, guide through-hole; 13, core head; 14, spring; 15, installation groove; 16, air pipe; 17, core rod; 18, opening; 2, table board; 21, rotating shaft; 22, jet duct; 23, ejector rod; 24, adjusting pad; 25, injection pipe; 251, injection channel; 3, rotating disk; 31, ventilation channel; 311, mating hole; 312, ventilation hole; 32, cover plate; 33, directional through-hole; 331, piston sleeve; 332, pushing piston; 34, guide groove; 35, push plate; 351, first inclined surface; 36, guide hole; 361, holding piston; 3611, second inclined surface; 362, limiting protrusion; 363, abutting protrusion; 37, air flow channel; 38, holding pressing plate; 39, pit. Detailed implementation manners

[0040] The present invention will be further described in detail below with reference to the accompanying drawings.

[0041] An embodiment of the present application discloses a gas guiding structure of an injection blow hollow molding machine. Referring to Figure 2 , a gas guiding structure of an injection blow hollow molding machine includes a table board 2. A rotating shaft 21 is penetrated through the table board 2. The rotating shaft 21 is vertically arranged and can rotate and lift. The structure for driving the rotation and lifting of the rotating shaft 21 is the prior art, so it will not be elaborated here;

[0042] Referring to Figure 2 , a triangular prism-shaped rotating disk 3 is fixedly installed at the top end of the rotating shaft 21. The side wall positions of the rotating disk 3 are sequentially distributed with a blow molding station, a blowing station, and a demolding station. The structures at the three stations have the same parts. Combining Figure 3 , taking the same part structure at one of the stations as an example: A ventilation channel 31 is opened in the rotating disk 3. The ventilation channel 31 includes a vertically arranged mating hole 311 and a horizontally arranged ventilation hole 312. The mating hole 311 is a through hole. A cover plate 32 covering the mating hole 311 is provided at the top end of the mating hole 311. One end of the ventilation hole 312 is communicated with the mating hole 311; A plurality of horizontally arranged directional through holes 33 are opened on the circumferential side wall of the ventilation hole 312. A piston sleeve 331 is fixedly installed in each directional through hole 33. The outer side wall of the piston sleeve 331 fits with the side wall of the directional through hole 33. A pushing piston 332 adapted to the piston sleeve 331 is installed on each piston sleeve 331. The pushing piston 332 can slide in the directional through hole 33 along the arrangement direction of the piston sleeve 331; A guide groove 34 is opened on the rotating disk 3 at the end of the pushing piston 332 away from the ventilation hole 312. The guide groove 34 is communicated with a plurality of directional through holes 33. A push plate 35 is installed in the guide groove 34. The guide groove 34 can guide the movement of the push plate 35. At the top of the table board 2, a jet pipe 22 capable of jetting gas is provided in the pointing direction of the mating hole 311. The jet pipe 22 is vertically arranged. The jet pipe 22 can be inserted into the mating hole 311 to supply gas to the mating hole 311.

[0043] Referring to Figure 2 and Figure 3 , a gas injection pipe 25 capable of jetting gas is further provided at the top of the table board 2. The distance between the upper end surface of the gas injection pipe 25 and the table board 2 is less than the distance between the upper end surface of the jet pipe 22 and the table board 2. An air injection channel 251 is opened on the rotating disk 3. The gas injection pipe 25 can be inserted into the air injection channel 251 to inject gas into the air injection channel 251.

[0044] Referring to Figure 1 and Figure 2, initially, the turntable 3 is in the high position state. After the bottle is sleeved onto the mandrel 1, the rotating shaft 21 drives the turntable 3 to descend in place. Combining Figure 3 , the descending in place here means that the turntable 3 descends until the injection pipe 25 is inserted into the injection channel 251; at this time, the jet pipe 22 will also be inserted into the mating hole 311. The jet pipe 22 first ejects gas, and the gas will first reach the mating hole 311 and then enter the ventilation channel 31. Then the gas will push the push piston 332 to slide along the set direction of the piston sleeve 331 in the guiding through hole. The movement of the push piston 332 will push against the push plate 35, driving the push plate 35 to move. The movement of the push plate 35 will exert a push on the core rod 17. The movement of the core rod 17 will cause the core head 13 to move to the right. The movement of the core head 13 to the right will cause an outward blowing opening 18 to be formed on the mandrel 1, that is, the movement of the core head 13 to the right will cause the opening 18 to open; at this time, the injection pipe 25 ejects gas into the injection channel 251, and the gas will reach the air pipe 16, then reach the installation groove 15 from the air pipe 16, pass through the opening 18, and then enter the bottle to blow air into the bottle.

[0045] Refer to Figure 3 and Figure 4 , between every two orientation through holes 33 on the turntable 3, there are guiding holes 36. Each guiding hole 36 is a vertically arranged through hole and is communicated with the guiding groove 34. Each guiding hole 36 is provided with a holding piston 361, and the holding piston 361 can slide in the guiding hole 36. An air flow channel 37 is also opened in the turntable 3. One end of the air flow channel 37 is communicated with the upper cavity of the guiding hole 36, and the other end of the air flow channel 37 is communicated with the ventilation channel 31. The guiding hole 36 is also provided with an annular limiting protrusion 362. The top of the holding piston 361 is provided with an abutting protrusion 363. The lower end of the abutting protrusion 363 abuts against the upper end of the limiting protrusion 362 to prevent the holding piston 361 from sliding out from the bottom of the guiding hole 36.

[0046] After the gas ejected by the jet pipe 22 enters the ventilation channel 31, the gas will not only push the push piston 332 to move, but also enter the upper cavity of the guiding hole 36 through the air flow channel 37. The gas entering the guiding hole 36 will push the holding piston 361 to move downward. After the holding piston 361 moves downward until the abutting protrusion 363 abuts against the limiting protrusion 362, the side wall of the abutting protrusion 363 can abut against the push plate 35 located in the guiding groove 34 to prevent the push plate 35 from resetting. Although the gas is divided into two branches after reaching the ventilation channel 31, that is, it will simultaneously push the push piston 332 to move and push the holding piston 361 to move downward, when the holding piston 361 has not been pushed, the push plate 35 has not moved either. At this time, the non-moving push plate 35 will block the holding piston 361, making the holding piston 361 unable to move downward. Only when the push plate 35 moves to the right can the holding piston 361 move downward.

[0047] Refer toFigure 4 and Figure 5 On the rotating disk 3, there is a holding pressure plate 38 that covers the top end of the guiding hole 36. The holding pressure plate 38 is installed on the rotating disk 3 by screws. At one end of the guiding hole 36 at the bottom of the rotating disk 3, there is also a pit 39, and the bottom end of the holding piston 361 can slide into the pit 39. The structures at the three stations also have different parts. On the top of the table board 2, a ejector rod 23 is fixedly installed at the pointing position of the guiding hole 36 at the demolding station. The diameter of the ejector rod 23 is larger than the inner circle diameter of the limit protrusion 362.

[0048] Referring to Figure 5 , on the upper end surface of the push plate 35 near one end of the holding piston 361, there is an upward first inclined surface 351, and on the side wall of the holding piston 361, there is a downward second inclined surface 3611. The second inclined surface 3611 is used to abut against the first inclined surface 351 to make the push plate 35 move. When the pushing piston 332 does not push the push plate 35 in place, during the downward movement of the holding piston 361, it will collide with the push plate 35, and the second inclined surface 3611 will abut against the first inclined surface 351 to apply a force to the push plate 35 so that the push plate 35 is pushed to the designated position. Referring to Figure 4 , on the rotating shaft, a circular adjusting pad 24 is sleeved on the top of the table board 2. When the upper end surface of the adjusting pad 24 abuts against the lower end surface of the rotating disk 3, the top of the ejector rod 23 also abuts against the bottom surface of the pit 39. The adjusting pad 24 is made of an elastic material such as rubber, and the adjusting pad 24 can be disassembled into two parts.

[0049] The implementation principle of the air guiding structure of an injection blow hollow molding machine in the embodiment of the present application is as follows: First, at the blowing station, after installing the bottle on the core rod 1, the rotating disk 3 descends in place. The injection pipe 25 is inserted into the injection channel 251 and the jet pipe 22 will also be inserted into the mating hole 311. After the jet pipe 22 injects gas into the ventilation channel 31, the gas will reach the directional through hole 33 to push the pushing piston 332, causing the push plate 35 to move. The movement of the push plate 35 will generate a thrust on the core rod 17, and the movement of the core rod 17 will cause the opening 18 to open;

[0050] Then the injection pipe 25 can be inserted into the injection channel 251 to inject gas into the injection channel 251, so that the bottle installed on the core rod 1 is blown;

[0051] The gas located within the ventilation passage 31 will also enter the upper cavity within the guiding hole 36 when passing through the air flow passage 37. The gas will generate a thrust force on the top of the holding piston 361. The holding piston 361 will be pushed and move downward. Then, the holding piston 361 will be able to hold the push plate 35 in place. At this time, the rotating disk 3 can rise. After the rotating disk 3 rises, the holding piston 361 can still hold the push plate 35 in place. The push plate 35 will still not reset. The push plate 35 can still exert an external force on the core rod 17 so that the orifice 18 will not close due to the action of the spring 14. However, the injection tube 25 is separated from the injection passage 251. Therefore, the gas within the bottle will flow back through the orifice 18, that is, the air pressure within the bottle gradually decreases.

[0052] After the rotating disk 3 rotates the bottle installed at the blowing station to the demolding station, the rotating disk 3 descends, and when it descends to the ejector rod 23 to lift the holding piston 361 back to its original position, the push plate 35 will also reset due to the action of the spring 14 within the core rod 1.

[0053] The embodiment of the present application also discloses a gas guiding method for a gas guiding structure applied to an injection blow hollow molding machine, including the following steps:

[0054] S1. First, after the rotating disk 3 descends to the appropriate position, the jet conduit 22 will communicate with the ventilation passage 31. The gas ejected from the jet conduit 22 will first enter the ventilation passage 31, and then the gas will enter the directional through-hole 33 to push the push piston 332 to move, thereby driving the push plate 35 to move. The movement of the push plate 35 will drive the core rod 17 to move, thereby driving the core head 13 to move and opening the orifice 18. The gas ejected from the jet conduit 22 into the ventilation passage 31 will also reach the guiding hole 36, and the gas will push the holding piston 361 to move, so that the holding piston 361 will hold the push plate 35 in place. The held push plate 35 will prevent the core head 13 from resetting and keep the orifice 18 in an open state.

[0055] S2. After the rotating disk 3 rises, the jet conduit 22 will be separated from the ventilation passage 31. The ventilation passage 31 will deflate. The holding piston 361 will continue to hold the push plate 35 in place and continue to keep the orifice 18 in an open state.

[0056] S3. After the rotating disk 3 rotates and descends to the specified position again, the ejector rod 23 will insert into the guiding hole 36 to push the holding piston 361 to reset. The push plate 35 will reset due to the action of the spring 14. The reset of the push plate 35 will cause the orifice 18 to close.

[0057] The embodiments of the present specific implementation manners are all preferred embodiments of the present invention, and do not limit the protection scope of the present invention accordingly. Therefore, all equivalent changes made according to the structure, shape, and principle of the present invention should be covered within the protection scope of the present invention.

Claims

1. An air guiding structure of an injection blow hollow molding machine, including a table panel (2), on which a rotating shaft (21) capable of lifting and rotating after rising is provided. At the top of the rotating shaft (21), a rotating disk (3) is provided. Characterized in that: At the top of the table panel (2), a jet pipe (22) capable of discharging air is provided. Inside the rotating disk (3), a ventilation channel (31) is provided. The jet pipe (22) can be inserted into the ventilation channel (31). A number of directional through holes (33) are opened on the side wall of the ventilation channel (31). Inside each directional through hole (33), a push piston (332) is provided. At the end of the push piston (332) away from the ventilation channel (31), a push plate (35) is provided. Inside the rotating disk (3), a guiding hole (36) is also opened. Inside the guiding hole (36), a holding piston (361) capable of sliding in the guiding hole (36) is provided. At the top end of the side wall of the guiding hole (36), an air flow channel (37) communicating with the ventilation channel (31) is opened. The jet pipe (22) is used to jet air into the ventilation channel (31) so that the holding piston (361) moves to clamp the push plate (35).

2. The air guiding structure of an injection blow hollow molding machine according to claim 1, Characterized in that: At the top of the table panel (2) at the pointing position of the guiding hole (36), a push rod (23) is provided. At the bottom of the rotating disk (3) at one end of the guiding hole (36), a pit (39) is provided. The bottom end of the holding piston (361) is located in the pit (39). The diameter of the push rod (23) is larger than the diameter of the guiding hole (36).

3. The air guiding structure of an injection blow hollow molding machine according to claim 2, Characterized in that: A circular adjusting pad (24) is sleeved on the rotating shaft at the top of the table panel (2). The distance from the upper end face of the adjusting pad (24) to the lower end face of the rotating disk (3) is equal to the distance between the top of the push rod (23) and the bottom surface of the pit (39).

4. The air guiding structure of an injection blow hollow molding machine according to claim 3, Characterized in that: The adjusting pad (24) is used to buffer the rotating disk (3) after it descends, and the adjusting pad (24) is detachable.

5. The air guiding structure of an injection blow hollow molding machine according to claim 1, Characterized in that: A circular limiting protrusion (362) is provided inside the guiding hole (36). At the top end of the holding piston (361), an abutting protrusion (363) is provided. The abutting protrusion (363) abuts against the limiting protrusion (362) to prevent the holding piston (361) from sliding out of the bottom end of the guiding hole (36).

6. The air guiding structure of an injection blow hollow molding machine according to claim 1, Characterized in that: Inside each directional through hole (33), a piston sleeve (331) adapted to the push piston (332) is provided, and the push piston (332) is installed on the piston sleeve (331).

7. The air guiding structure of an injection blow hollow molding machine according to claim 1, characterized in that: One end of the push plate (35) close to the holding piston (361) is provided with an upward first inclined surface (351), and a downward second inclined surface (3611) is provided on the side wall of the holding piston (361). The second inclined surface (3611) is used to abut against the first inclined surface (351) to move the push plate (35).

8. The air guiding structure of an injection blow hollow molding machine according to claim 1, characterized in that: A guiding groove (34) is formed at one end of the rotating disc (3) away from the ventilation channel (31) of the pushing piston (332), and the push plate (35) is installed in the guiding groove (34).

9. The air guiding structure of an injection blow hollow molding machine according to claim 1, characterized in that: The top end of the guiding hole (36) is communicated with the outside, and a holding pressing plate (38) covering the guiding hole (36) is detachably installed on the rotating disc (3).

10. An air guiding method for the air guiding structure of an injection blow hollow molding machine according to any one of claims 1-9, characterized in that it includes the following steps: S1. First, after the rotating disc (3) descends in place, the jet pipe (22) will be communicated with the ventilation channel (31). The jet pipe (22) will jet air into the ventilation channel (31), and then the air will enter the directional through hole (33) to push the pushing piston (332) to move, thereby driving the push plate (35) to move; The air jetted into the ventilation channel (31) by the jet pipe (22) will also reach the guiding hole (36), and the air will push the holding piston (361) to move, so that the holding piston (361) will hold the push plate (35) in place; S2. After a period of time, the rotating disc (3) will rise, the jet pipe (22) will be separated from the ventilation channel (31), the jet pipe (22) will stop jetting air, the ventilation channel (31) will deflate, and the holding piston (361) will continue to hold the push plate (35) in place; S3. After the rotating disc (3) rotates and descends to the specified position again, the ejector rod (23) will be inserted into the guiding hole (36) to push the holding piston (361) to reset, and the push plate (35) will be reset due to external force.

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