Heating pre-blowing mechanism in one-step injection-drawing-blowing integrated forming machine
By designing a heating pre-blowing mechanism that can heat the bottle port and the side wall at the same time in a one-step injection-pull blowing integrated molding machine, the problems of low heating efficiency and inability to accurately control the heating temperature in the prior art are solved, and the full extension of the bottle port and the side wall are achieved, and the blow molding quality is improved.
Patent Information
- Application Number
- CN202421954584.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-13
- Publication Date
- 2025-06-17
- Estimated Expiration
- 2034-08-13
AI Technical Summary
The heating pre-blowing mechanism in the existing one-step injection-pull blowing integrated molding machine has low heating efficiency, cannot accurately control the heating temperature, and can only heat the side walls of the bottle preform, and cannot heat the bottle opening, resulting in a decrease in the bottle opening temperature, affecting the extension of the bottle opening during blow molding, which can easily lead to defects such as unevenness or cracks.
A heating pre-blowing mechanism is designed, including an air needle plate, a pre-blowing drum, a thermally conductive fixing tube and a heating furnace. The bottle opening and side walls of the bottle pre-blowing drum are heated simultaneously through the heating tube and the heating ring, the bottle opening is heated by the thermally conductive fixing tube and the thermally conductive head, and the bottle pre-blowing drum is pre-blowing to ensure the full extension of the bottle opening and side walls.
The heating efficiency is improved, and the precise heating of the side walls and bottle openings of the bottle preforms is achieved, ensuring the full extension of the bottle openings and side walls is ensured, and the blow molding quality is improved, and defects such as unevenness or cracks are avoided.
Smart Images
Figure CN222987539U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to an injection stretch blow molding machine, in particular to a heating and pre-blowing mechanism in a one-step injection stretch blow molding machine. Background Art
[0002] When producing plastic bottles, in order to improve production efficiency and processing accuracy, a one-step injection stretch blow molding machine is mostly selected for production. The one-step injection stretch blow molding machine includes: a mold base, on which a molding mechanism, a preheating mechanism, a blow molding mechanism and a demolding mechanism are arranged. A turntable is rotatably arranged on the mold base, and four die plates are circumferentially and evenly distributed on the turntable. Each die plate corresponds to a mechanism. A number of die orifices are arranged on the die plate. The die plate and the molding mechanism cooperate to form a preform in the die orifice. The die plate with the preform rotates to the preheating mechanism to preheat the preform in the die orifice. The die plate drives the preheated preform to rotate to the blow molding mechanism to be blow molded into a bottle, and finally rotates to the demolding mechanism for demolding. However, the preheating mechanism on the market at present has low heating efficiency, cannot accurately control the heating temperature, and can only heat the side wall of the preform, and cannot heat the bottle mouth of the preform. During the whole process of switching workstations, the temperature of the bottle mouth of the preform decreases. After the temperature of the bottle mouth decreases, it will affect the stretching amount of the bottle mouth during blow molding. During subsequent blow molding, the bottle mouth is prone to defects such as unevenness or cracks due to insufficient stretching. Summary of the Utility Model
[0003] The purpose of the utility model is to provide a heating and pre-blowing mechanism in a one-step injection stretch blow molding machine that can heat the side wall and the bottle mouth of the preform, and can pre-blow the preform during the heating process to ensure the subsequent blow molding quality.
[0004] To achieve the above purpose, the technical solution adopted by the utility model is: a heating and pre-blowing mechanism in a one-step injection stretch blow molding machine, including: a mold base, on which a turntable is rotatably arranged, four die plates are circumferentially and evenly distributed on the turntable, a number of die orifices are arranged on the die plate, a needle plate is arranged in the upper part of the mold base in a lifting manner, a number of connection holes and air channels communicating with each connection hole are arranged in the needle plate, a pre-blowing cylinder is hermetically arranged in the connection hole, an installation hole penetrating the upper and lower walls of the pre-blowing cylinder is arranged in the pre-blowing cylinder, a number of air inlet holes communicating the installation hole with the connection hole are arranged on the side wall of the pre-blowing cylinder, a heat-conducting fixing tube is hermetically arranged in the installation hole, the bottom of the heat-conducting fixing tube extends downward out of the pre-blowing cylinder, an air passing gap is left between the heat-conducting fixing tube and the installation hole, a heating tube is arranged in the heat-conducting fixing tube, a heat-conducting head is arranged at the bottom of the heat-conducting fixing tube, a mounting plate is arranged in the lower part of the mold base in a lifting manner, a number of heating furnaces are arranged on the mounting plate, a heating coil is coated on the outer side wall of the heating furnace, a positioning plate is arranged above the mounting plate, the positioning plate abuts against the heating furnace, and a positioning hole coaxially aligned with the heating furnace is arranged on the positioning plate.
[0005] Further, in the heating and pre-blowing mechanism of the aforementioned one-step injection stretch blow molding machine, a first avoidance hole is provided at the center of the bottom wall of the heating furnace, and a second avoidance hole communicating and aligned with the first avoidance hole is provided on the positioning plate.
[0006] Further, in the heating and pre-blowing mechanism of the aforementioned one-step injection stretch blow molding machine, a plurality of isolation grooves are circumferentially and evenly distributed on the inner side wall of the positioning hole, and contact ribs are protrudingly provided between every two adjacent isolation grooves.
[0007] Further, in the heating and pre-blowing mechanism of the aforementioned one-step injection stretch blow molding machine, a lower heat insulation pad is provided between the mounting plate and the heating furnace. The lower end of the heating furnace is clamped on the lower heat insulation pad and does not directly contact the mounting plate. An upper heat insulation pad is provided between the positioning plate and the heating furnace. The upper end of the heating furnace is clamped on the upper heat insulation pad and does not directly contact the positioning plate.
[0008] Further, in the heating and pre-blowing mechanism of the aforementioned one-step injection stretch blow molding machine, the connection structure between the air needle plate, the pre-blowing cylinder and the heat conduction fixing tube is as follows: an inner boss extends inward in the connection hole of the air needle plate, and outer shoulders extend outward on the side walls on the upper and lower sides of the air inlet hole. A first sealing ring is clamped between the two outer shoulders. The outer shoulder located above is hermetically fitted with the inner wall of the connection hole through the first sealing ring. The outer shoulder located below abuts against the inner boss and is hermetically fitted with the inner wall of the inner boss through the first sealing ring. The upper wall of the pre-blowing cylinder is flush with the upper wall of the air needle plate. A limiting hole is expanded in the mounting hole of the pre-blowing cylinder. A limiting head is provided on the heat conduction fixing tube, and a second sealing ring is provided on the outer side wall of the limiting head. The limiting head of the heat conduction fixing tube is clamped in the limiting hole and is hermetically fitted with the limiting hole through the second sealing ring. The upper wall of the limiting head of the heat conduction fixing tube is flush with the upper wall of the pre-blowing cylinder. An installation groove is provided downward on the upper wall of the limiting head of the heat conduction fixing tube. The heating tube is clamped in the installation groove, and the upper wall of the heating tube is flush with the upper wall of the limiting head of the heat conduction fixing tube. A wire passing plate is provided on the upper wall of the air needle plate, and a wire passing groove is provided on the wire passing plate. The cable on the heating tube passes through the wire passing groove and extends outward.
[0009] Further, in the heating and pre-blowing mechanism of the aforementioned one-step injection stretch blow molding machine, a cooling groove is provided on the upper wall of the wire passing plate, an upper guiding plate is provided on the upper wall of the wire passing plate, two first upper guiding rods are slidably provided at the left and right ends of the upper guiding plate respectively, the four first upper guiding rods are vertically fixed on the mold base, an upper fixing plate is fixedly provided between the four first upper guiding rods, and an upper air cylinder is provided on the upper fixing plate. The piston rod of the upper air cylinder is connected downward to the upper guiding plate.
[0010] Furthermore, in the heating and pre-blowing mechanism of the aforementioned one-step injection stretch blow molding machine, a second upper guide rod is vertically arranged at each of the left and right ends of the upper guide plate, and the two second upper guide rods are slidably connected to the upper fixing plate.
[0011] Furthermore, in the heating and pre-blowing mechanism of the aforementioned one-step injection stretch blow molding machine, a number of support rods are arranged downward on the mounting plate, each support rod is connected to the same lifting plate, the lifting plate is connected to the lower guide plate, two lower guide rods are vertically arranged at each of the left and right ends of the lower guide plate, a lower fixing plate is slidably clamped between the two lower guide rods, the lower fixing plate is connected to the mold base, a lower cylinder is arranged on the lower fixing plate, and the piston rod of the lower cylinder is upwardly connected to the lower guide plate.
[0012] The advantages of the present utility model are as follows: when the mold on the turntable enters the heating and pre-blowing mechanism, the pre-blowing cylinder extends into the mold, the heating tube heats, the heat-conducting fixed tube and the heat-conducting head descend together with the pre-blowing cylinder after being heated, the heat-conducting fixed tube and the heat-conducting head extend into the preform to heat the mouth of the preform, the heating coil heats, the heating furnace rises after being heated to cooperate with the mold to heat the side wall of the preform, the heating tube and the heating coil are used to heat the mouth and the side wall of the preform at the same time, which can not only improve the heating efficiency, but also accurately adjust the heating temperature of the heating tube and the heating coil, so as to accurately control the temperature of the side wall and the mouth of the preform, so that the side wall and the mouth of the preform have sufficient stretching amount, and then the preform is pre-blown through the pre-blowing cylinder, so that the preform is blown and stretched in the heating furnace, which can ensure the uniformity of the side wall wall thickness and the mouth wall thickness of the preform. In this way, when the pre-blown preform enters the blow molding mechanism for blow molding, the blow molding quality of the bottle can be improved; the compressed air for pre-blowing will be heated to a temperature close to the inner wall temperature of the preform, so that the situation that the inner wall of the preform becomes hard due to the influence of the low-temperature compressed air and the blow molding and stretching are uneven will not occur. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] Figure 1 is a schematic structural diagram of the heating and pre-blowing mechanism in the one-step injection stretch blow molding machine described in the present utility model.
[0014] Figure 2 is Figure 1 a three-dimensional sectional structural diagram of
[0015] Figure 3 is Figure 1 a schematic connection structural diagram between the wire passing plate, the air needle plate, the pre-blowing cylinder, the heat-conducting fixed tube and the heating tube in
[0016] Figure 4 is Figure 3 a sectional structural diagram in the A-A direction in
[0017] Figure 5It is a schematic diagram of the connection structure among the mounting plate, the positioning plate, the heating furnace and the heating coil.
[0018] Figure 6 It is Figure 5 a schematic diagram of the sectional structure in the B-B direction in Specific embodiments
[0019] The technical solution of the present utility model will be further described below in conjunction with the accompanying drawings and preferred embodiments.
[0020] As Figures 1 to 6As shown in the figure, the heating and pre-blowing mechanism in the one-step injection stretch blow molding machine of the present utility model includes: a mold base 1, on which a turntable 11 is rotatably arranged. Four orifice plates 12 are circumferentially and evenly distributed on the turntable 11. A number of orifices 13 are arranged on the orifice plates 12. An air needle plate 2 is arranged to move up and down at the upper part of the mold base 1. A number of connection holes 21 and air channels 22 communicating with each connection hole 21 are arranged in the air needle plate 2. A pre-blowing cylinder 23 is hermetically arranged in the connection hole 21. An installation hole 231 penetrating the upper and lower walls of the pre-blowing cylinder 23 is arranged in the pre-blowing cylinder 23. A number of air inlet holes 232 communicating the installation hole 231 with the connection hole 21 are arranged on the side wall of the pre-blowing cylinder 23. An inner boss 211 extends inward in the connection hole 21 of the air needle plate 2. Outer shoulders 233 extend outward on the side walls of the pre-blowing cylinder 23 on both the upper and lower sides of the air inlet hole 232. A first sealing ring 2331 is clamped in the two outer shoulders 233. The upper outer shoulder 233 is hermetically attached to the inner wall of the connection hole 21 through the first sealing ring 2331. The lower outer shoulder 233 abuts against the inner boss 211 and is hermetically attached to the inner wall of the inner boss 211 through the first sealing ring 2331. The upper wall of the pre-blowing cylinder 23 is flush with the upper wall of the air needle plate 2. A heat-conducting fixing tube 24 is hermetically arranged in the installation hole 231. The bottom of the heat-conducting fixing tube 24 extends downward out of the pre-blowing cylinder 23. A limiting hole 2311 is expanded in the installation hole 231 of the pre-blowing cylinder 23. A limiting head 241 is arranged on the heat-conducting fixing tube 24. A second sealing ring 242 is arranged on the outer side wall of the limiting head 241. The limiting head 241 of the heat-conducting fixing tube 24 is clamped in the limiting hole 2311 and is hermetically attached to the limiting hole 2311 through the second sealing ring 242. The upper wall of the limiting head 241 of the heat-conducting fixing tube 24 is flush with the upper wall of the pre-blowing cylinder 23. An air passage gap is left between the heat-conducting fixing tube 24 and the installation hole 231. An installation groove 243 is arranged downward on the upper wall of the limiting head 241 of the heat-conducting fixing tube 24. A heating tube 25 is clamped in the installation groove 243. The upper wall of the heating tube 25 is flush with the upper wall of the limiting head 241 of the heat-conducting fixing tube 24. A wire-passing plate 26 is arranged on the upper wall of the air needle plate 2. When the wire-passing plate 26 is pressed against the air needle plate 2, it acts on the pre-blowing cylinder 23, the heat-conducting fixing tube 24 and the heating tube 25 at the same time. A wire-passing groove 261 is arranged on the wire-passing plate 26. The cable on the heating tube 25 passes through the wire-passing groove 261 and extends outward. A heat-conducting head 27 made of beryllium copper is arranged at the bottom of the heat-conducting fixing tube 24.
[0021] A mounting plate 3 is provided with a lifting mechanism at the lower part of the mold base 1. A number of heating furnaces 31 are arranged on the mounting plate 3. A heating coil 32 is wrapped around the outer side wall of the heating furnace 31. A positioning plate 4 is arranged above the mounting plate 3. The positioning plate 4 abuts against the heating furnace 31. A positioning hole 41 coaxial with the heating furnace 31 is arranged on the positioning plate 4. In order to prevent a large amount of heat from being transferred to the mounting plate 3 when the heating coil 32 heats the heating furnace 31, causing the mounting plate 3 to be deformed by heat, a lower heat insulation pad 33 is arranged between the mounting plate 3 and the heating furnace 31. The lower end of the heating furnace 31 is clamped on the lower heat insulation pad 33 and does not directly contact the mounting plate 3. A first avoidance hole 311 is opened at the center of the bottom wall of the heating furnace 31. A second avoidance hole 34 aligned with the first avoidance hole 311 is arranged on the mounting plate 3. An upper heat insulation pad 42 is arranged between the positioning plate 4 and the heating furnace 31. The upper end of the heating furnace 31 is clamped on the upper heat insulation pad 42 and does not directly contact the positioning plate 4, preventing the positioning plate 4 from being deformed after receiving a large amount of heat radiation. A number of isolation grooves 411 are circumferentially and evenly distributed on the inner side wall of the positioning hole 41. A contact rib 412 protrudes between every two adjacent isolation grooves 411.
[0022] The turntable 11 rotates the blank mold plate 12 with the preforms to the in-place position, aligning the mold cavities 13 on the blank mold plate 12 with the pre-blowing cylinders 23 and the heating furnace 31 one by one vertically. Then, the heating element 25 heats the heat-conducting fixed tube 24, and the heat-conducting heads 27 on the heat-conducting fixed tube 24 are heated together. The heating coil 32 heats the heating furnace 31. Then, the pre-blowing cylinder 23 moves downward and inserts into the corresponding mold cavity 13 and seals and fits with the inner wall of the mold cavity 13. The heat-conducting head 27 extends into the preform and aligns with the mouth of the preform. The heat-conducting head 27 performs thermal radiation heating on the mouth of the preform. The heating furnace 31 moves upward and encloses the outside of the preform. The contact ribs 412 on the positioning holes 41 on the positioning plate 4 are in contact with the outer wall of the mold cavity 13, which facilitates the cooperation between the positioning holes 41 and the mold cavity 13. The preforms on the mold cavity 13 extend into the heating furnace 31, and the heating furnace 31 performs thermal radiation heating on the side walls of the preforms. Compressed air flows through the air channels 22 of the air needle plate 2 into the air passing gap between the pre-blowing cylinder 23 and the heat-conducting fixed tube 24 and is blown into the preform. When the compressed air passes through the air passing gap, it will be heated by the heat-conducting fixed tube 24. Therefore, the temperature of the compressed air acting on the preform is close to the temperature of the preform, and it will not affect the stretching quality of the side wall of the preform. After the side walls and the mouths of the preforms are heated, they can be fully stretched when pre-blown, thus ensuring the uniformity of the wall thickness of the mouth and the side walls. When the preforms are pre-blown, they will expand in the heating furnace 31, and the air in the heating furnace 31 will be discharged outward from the first relief hole 311 and the second relief hole 34, which will not affect the blow molding and stretching of the preforms. Moreover, during the blow molding and stretching process of the preforms, the sprues on the preforms will extend into the first relief hole 311, preventing the sprues from being squeezed on the preforms and affecting the appearance. When the pre-blowing is completed, the pre-blowing cylinder 23 and the heating furnace 31 leave the mold cavity 13, and the turntable 11 can rotate the preforms after pre-blowing to the blow molding mechanism for blow molding.
[0023] A cooling groove 262 is provided on the upper wall of the wire passing plate 26. When the heat generated by the heating tube 25 is transferred to the wire passing plate 26, the side wall of the cooling groove 262 will dissipate heat, and the air in the cooling groove 262 is heated. The hot air in the cooling groove 262 will exchange heat with the external cold air to cool down the wire passing plate 26. An upper guide plate 5 is provided on the upper wall of the wire passing plate 26. Two first upper guide rods 51 are slidably provided at the left and right ends of the upper guide plate 5 respectively. The four first upper guide rods 51 are vertically fixed on the die carrier 1. An upper fixing plate 52 is fixedly provided between the four first upper guide rods 51. An upper air cylinder 53 is provided on the upper fixing plate 52. The piston rod of the upper air cylinder 53 is downwardly connected to the upper guide plate 5. A second upper guide rod 54 is vertically provided at the left and right ends of the upper guide plate 5 respectively. The two second upper guide rods 54 are slidably connected to the upper fixing plate 52. Driving the upper guide plate 5 by the upper air cylinder 53 can drive the wire passing plate 26 and the air needle plate 2 to lift, so as to drive the pre-blowing cylinder 23, the heat conduction fixing tube 24, the heating tube 25 and the heat conduction head 27 to approach or move away from the die orifice 13.
[0024] A number of support rods 35 are downwardly provided on the mounting plate 3. Each support rod 35 is connected to the same lifting plate 36. When the heat on the mounting plate 3 is transferred to the lifting plate 36 through the support rods 35, the heat loss is fast, and the heat radiation received by the lifting plate 36 is small. The lifting plate 36 is connected to the lower guide plate 6. Two lower guide rods 61 are vertically provided at the left and right ends of the lower guide plate 6 respectively. A lower fixing plate 62 is slidably clamped between the two lower guide rods 61. The lower fixing plate 62 is connected to the die carrier 1. A lower air cylinder 63 is provided on the lower fixing plate 62. The piston rod of the lower air cylinder is upwardly connected to the lower guide plate. Driving the lower guide plate 6 by the lower air cylinder 63 can drive the lifting plate 36, the mounting plate 3 and the positioning plate 4 to lift, so as to drive the heating furnace 31 to approach or move away from the die orifice 13.
[0025] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Although the present invention has been described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: the specific implementation manners of the present invention can still be modified or equivalently replaced, and any modification or equivalent replacement without departing from the spirit and scope of the present invention should be covered by the protection scope of the claims of the present invention.
Claims
1. The heating pre-blowing mechanism in the one-step injection stretch blow molding machine includes: The mold frame is provided with a turntable for rotation on the mold frame, four die plates are evenly distributed on the turntable, and a plurality of die plates are provided on the die plates. The mold frame is characterized in that: an air needle plate is provided for lifting at the upper part of the mold frame, a plurality of connecting holes and air passages connected with the connecting holes are provided in the air needle plate, a pre-blowing cylinder is sealed in the connecting hole, a mounting hole penetrating the upper and lower walls of the pre-blowing cylinder is provided in the pre-blowing cylinder, a plurality of air inlet holes connecting the mounting hole and the connecting hole are provided on the side wall of the pre-blowing cylinder, and a A heat-conducting fixed tube, the bottom of which extends downward from the pre-blowing cylinder, an air gap is left between the heat-conducting fixed tube and the mounting hole, a heating tube is arranged in the heat-conducting fixed tube, a heat-conducting head is arranged at the bottom of the heat-conducting fixed tube, a mounting plate is arranged for lifting at the lower part of the mold frame, a plurality of heating furnaces are arranged on the mounting plate, a heating ring is coated on the outer side wall of the heating furnace, a positioning plate is arranged above the mounting plate, the positioning plate rests on the heating furnace, and a positioning hole coaxially aligned with the heating furnace is arranged on the positioning plate.
2. The heating pre-blowing mechanism in the one-step injection stretch blow molding machine according to claim 1, characterized in that: A first avoidance hole is opened at the center of the bottom wall of the heating furnace, and a second avoidance hole connected to and aligned with the first avoidance hole is arranged on the positioning plate.
3. The heating pre-blowing mechanism in the one-step injection stretch blow molding machine according to claim 1, characterized in that: A plurality of isolation grooves are evenly distributed on the circumference of the inner side wall of the positioning hole, and a contact rib is protrudingly arranged between every two adjacent isolation grooves.
4. The heating pre-blowing mechanism in the one-step injection stretch blow molding machine according to claim 1, characterized in that: A lower insulation pad is arranged between the mounting plate and the heating furnace, and the lower end of the heating furnace is clamped on the lower insulation pad without direct contact with the mounting plate. An upper insulation pad is arranged between the positioning plate and the heating furnace, and the upper end of the heating furnace is clamped on the upper insulation pad without direct contact with the positioning plate.
5. The heating pre-blowing mechanism in the one-step injection stretch blow molding machine according to any one of claims 1 to 4, characterized in that: The connection structure between the air needle plate, the pre-blowing cylinder and the heat-conducting fixed tube is as follows: an inner boss is extended inwardly in the connection hole of the air needle plate, and outer bosses are extended outwardly on the side walls located on the upper and lower sides of the air inlet hole, and a first sealing ring is clamped in the two outer bosses. The upper outer boss is sealed with the inner wall of the connection hole through the first sealing ring, and the lower outer boss is against the inner boss and is sealed with the inner wall of the inner boss through the first sealing ring. The upper wall of the pre-blowing cylinder is flush with the upper wall of the air needle plate, and a limit hole is expanded in the mounting hole of the pre-blowing cylinder. A limiting head is provided on the fixed tube, and a second sealing ring is provided on the outer side wall of the limiting head. The limiting head of the heat-conducting fixed tube is clamped in the limiting hole and sealed with the limiting hole through the second sealing ring. The upper wall of the limiting head of the heat-conducting fixed tube is flush with the upper wall of the pre-blowing tube. An installation groove is downwardly provided on the upper wall of the limiting head of the heat-conducting fixed tube. The heating tube is clamped in the installation groove. The upper wall of the heating tube is flush with the upper wall of the limiting head of the heat-conducting fixed tube. A wire passing plate is provided on the upper wall of the air needle plate, and a wire passing groove is provided on the wire passing plate. The cable on the heating tube passes through the wire passing groove and extends outward.
6. The heating pre-blowing mechanism in the one-step injection stretch blow molding machine according to claim 5, characterized in that: A cooling groove is arranged on the upper wall of the wire passing plate, an upper guide plate is arranged on the upper wall of the wire passing plate, two first upper guide rods are slidably arranged on the left and right ends of the upper guide plate respectively, four first upper guide rods are vertically fixed on the mold frame, an upper fixed plate is fixedly arranged between the four first upper guide rods, an upper cylinder is arranged on the upper fixed plate, and the piston rod of the upper cylinder is downwardly connected to the upper guide plate.
7. The heating pre-blowing mechanism in the one-step injection stretch blow molding machine according to claim 6, characterized in that: A second upper guide rod is vertically arranged at the left and right ends of the upper guide plate respectively, and the two second upper guide rods are slidably connected to the upper fixed plate.
8. The heating pre-blowing mechanism in the one-step injection stretch blow molding machine according to any one of claims 1 to 4, characterized in that: A plurality of support rods are arranged downward on the mounting plate, each support rod is connected to the same lifting plate, the lifting plate is connected to the lower guide plate, two lower guide rods are vertically arranged at the left and right ends of the lower guide plate respectively, a lower fixing plate is slidably arranged between the two lower guide rods, the lower fixing plate is connected to the mold frame, a lower cylinder is arranged on the lower fixing plate, and a piston rod of the lower cylinder is upwardly connected to the lower guide plate.