Variable pitch device for plastic bottle preform blowing machine

Abstract

The application discloses a variable-pitch device of a plastic bottle embryo blowing machine, which comprises a support frame, first, second and third bottle blowing molds arranged in the upper end cavities of the support frame respectively, support legs welded on the two sides of the support frame, a pulling assembly arranged between the first, second and third bottle blowing molds, a fixed plate arranged at the lower end of the support frame, a variable-pitch assembly arranged at the upper end of the fixed plate, an inflation assembly arranged at the lower end of the fixed plate, and a positioning assembly arranged on one side of the variable-pitch assembly. The hydraulic cylinder drives the fixed plate to move upwards, the support plate on the fixed plate is inserted between the first and second bottle blowing molds through the first through groove, thereby avoiding the problem that the interval changes due to inertia when being pulled to the position, and the inserted support plate blocks the first and second bottle blowing molds, so that the interval between the first and second bottle blowing molds is constant.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of bottle blowing machines, in particular to a variable pitch device of a plastic bottle preform blowing machine. BACKGROUND

[0002] A bottle blowing machine refers to a machine that blows bottles. The simplest explanation is that it can blow plastic particles (softened into liquid) or prepared bottle preforms into bottles through certain process means. Bottle blowing machines are convenient and efficient, have large molding capacity, and have replaced most manual bottle blowing after their appearance. Most beverage companies use them. Common types include once-molded hollow extrusion blow machines using PP and PE, twice-molded injection stretch blow bottle blowing machines using PET, PC or PP, and newly developed multi-layer hollow extrusion blow and stretch blow molding.

[0003] According to the patent (CN216330017U), a plastic bottle preform blowing machine variable pitch device includes a mounting seat, the opposite ends of the mounting seat are fixedly installed with fixed plates, the two fixed plates are symmetrically distributed, two symmetrically distributed screw rods are rotatably installed between the two fixed plates, a motor is fixedly installed on one side of the fixed plate, the output shaft of the motor is fixedly connected with the end of the screw rod on the same side, a first movable block and a third movable block are arranged on the mounting seat, a plurality of second movable blocks with the same structure are arranged between the first movable block and the third movable block, and the first movable block and the second movable block.

[0004] At present, although the existing variable pitch device can adjust the distance between the bottle blowing molds, it still has some deficiencies, for example, the inertia during traction to the position causes different distances, the distance cannot be kept constant, the distance cannot be conveniently controlled and adjusted, the bottle blowing mold cannot be conveniently limited when it is in position, the working of the bottle blowing machine is affected, and the bottle blowing effect is affected. SUMMARY

[0005] The present application aims to provide a plastic bottle preform blowing machine variable pitch device that solves the problems raised in the background art.

[0006] To achieve the above-mentioned purpose, the present application provides the following technical scheme: a plastic bottle preform blowing machine variable pitch device, including a support frame, a first bottle blowing mold, a second bottle blowing mold and a third bottle blowing mold are arranged in the upper end cavity of the support frame, support legs are welded on both sides of the support frame, a pulling assembly is arranged between the first bottle blowing mold, the second bottle blowing mold and the third bottle blowing mold, a fixed plate is arranged at the lower end of the support frame, a variable pitch assembly is arranged at the upper end of the fixed plate, an inflation assembly is arranged at the lower end of the fixed plate, and a positioning assembly is arranged on one side of the variable pitch assembly.

[0007] As a preferred embodiment of the present application, the pulling assembly comprises a fixed frame, a limiting ring, a fixed rod, a fixed block, a first spring, a servo motor, a lead screw and a lead screw sleeve, the front and rear sides of the second bottle blowing mold and the third bottle blowing mold are welded with the fixed frame, the middle part of the fixed frame is provided with the fixed rod penetrating through, one end of the fixed rod is fixedly installed with the fixed block, one side of the support frame is fixedly installed with the servo motor, and the output end of the servo motor is installed with the lead screw.

[0008] By adopting the above technical scheme, the first bottle blowing mold, the second bottle blowing mold and the third bottle blowing mold are driven to move, and the spacing between the first bottle blowing mold, the second bottle blowing mold and the third bottle blowing mold is conveniently adjusted and controlled.

[0009] As a preferred embodiment of the present application, the variable distance assembly comprises a hydraulic cylinder, a fixed plate, a strutting plate, a sliding block, a sliding groove, a second spring and a first through groove, the other side of the support frame is provided with the hydraulic cylinder, the output end of the hydraulic cylinder is installed with the fixed plate, the upper end of the fixed plate is provided with the strutting plate, the upper end of the fixed plate is provided with the sliding groove on both sides, the lower end of the strutting plate is fixedly installed with the sliding block, and the lower end of the support frame is provided with the first through groove in the middle part.

[0010] By adopting the above technical scheme, the first through groove is provided, so that the strutting plate is conveniently inserted between the two bottle blowing molds during the upward movement of the fixed plate, and the pitch of the bottle blowing mold is adjusted and controlled.

[0011] As a preferred embodiment of the present application, the inflation assembly comprises an electric cylinder, a cylinder body, a piston head, a hose and an inflatable air bag, the lower end of the fixed plate is fixedly installed with the electric cylinder, the output end of the electric cylinder is installed with the piston head, the side close to the electric cylinder is provided with the cylinder body, and the middle part of the two strutting plates is provided with the inflatable air bag.

[0012] By adopting the above technical scheme, the spacing of the two strutting plates can be adjusted through the setting of the inflatable air bag, and the spacing of the adjacent two bottle blowing molds is adjusted during the upward movement of the strutting plate.

[0013] As a preferred embodiment of the present application, one side of the fixed frame is welded with a limiting ring, the outer side of the fixed rod is sleeved with a first spring, one end of the first spring is fixedly connected with the fixed block, the rear side of the first bottle blowing mold, the second bottle blowing mold and the third bottle blowing mold is welded with the fixed block, the fixed block is in sliding connection with the second slot, the front end of the first bottle blowing mold is fixedly installed with the lead screw sleeve, the size of the lead screw is matched with the size of the lead screw sleeve, and the lead screw is in threaded connection with the lead screw sleeve.

[0014] By adopting the technical scheme, the first bottle blowing mold is driven to move through the cooperation of the lead screw and the lead screw sleeve, and the second bottle blowing mold and the third bottle blowing mold behind the first bottle blowing mold are further driven to move through the cooperation of the fixing rod and the first spring.

[0015] As a preferred embodiment of the present application, the size of the sliding block is matched with the size of the sliding groove, and the sliding block is in sliding connection with the sliding groove.

[0016] By adopting the technical scheme, the second spring is arranged to apply a counterforce to the sliding block during the movement of the spreading plate to the two sides, thereby conveniently driving the spreading plate to reset.

[0017] As a preferred embodiment of the present application, the upper end inner side of the support frame is provided with a first slot and a second slot, and the upper end of the first bottle blowing mold, the second bottle blowing mold and the third bottle blowing mold is provided with a bottle blowing port.

[0018] By adopting the technical scheme, the first slot and the second slot are matched to ensure the stability of the movement of the first bottle blowing mold, the second bottle blowing mold and the third bottle blowing mold above the support frame.

[0019] As a preferred embodiment of the present application, the size of the inner cavity of the cylinder is matched with the size of the piston head, and the cylinder is in movable connection with the piston head.

[0020] By adopting the technical scheme, the air discharged from the cylinder is guided through the arrangement of the hose, thereby achieving the effect of adjusting the distance between the spreading plates.

[0021] As a preferred embodiment of the present application, the positioning assembly comprises a limiting frame, a limiting block, a positioning slot and a second through slot, the upper end of one side of the fixing plate is welded with the limiting frame, the upper end of the limiting frame is welded with the limiting block, and the lower end of the first bottle blowing mold, the second bottle blowing mold and the third bottle blowing mold is provided with the positioning slot.

[0022] By adopting the technical scheme, the limiting block on the limiting frame can be inserted into the positioning slot during the movement of the fixing plate through the arrangement of the second through slot, thereby achieving the effect of limiting the bottle blowing mold.

[0023] As a preferred embodiment of the present application, the first through slot is provided with the second through slot, the size of the limiting block is matched with the size of the positioning slot, and the limiting block is in movable connection with the positioning slot.

[0024] By adopting the technical scheme, the position of the bottle blowing mold above the second through groove is limited through cooperation of the limiting block and the positioning groove, thereby ensuring the work of the bottle blowing machine.

[0025] Compared with the prior art, the beneficial effects of the present application are as follows: the hydraulic cylinder can drive the fixed plate to move upward, the support plate on the fixed plate is inserted between the first bottle blowing mold and the second bottle blowing mold through the first through groove, thereby avoiding the problem that the spacing changes due to inertia when being pulled into position, and the first bottle blowing mold and the second bottle blowing mold are blocked by the inserted support plate, thereby ensuring the constant spacing of the first bottle blowing mold and the second bottle blowing mold.

[0026] The piston head can be driven to move to the right by the electric cylinder, the piston head discharges the air in the cylinder into the expansion air bag, the expansion air bag expands to push the support plate, thereby adjusting the spacing of the support plate, and thereby adaptively adjusting the variable-spacing spacing when the support plate is inserted between the first bottle blowing mold and the second bottle blowing mold.

[0027] The limiting block on the limiting frame of the fixed plate can be inserted into the positioning groove while the support plate is in position, thereby limiting the position of the bottle blowing mold moved above the second through groove, thereby ensuring the work of the bottle blowing machine, and thereby improving the bottle blowing effect. BRIEF DESCRIPTION OF DRAWINGS

[0028] Other features, objects and advantages of the present application will become more apparent from the following detailed description of non-limiting embodiments, made with reference to the accompanying drawings:

[0029] Figure 1 It is a perspective view of the variable-spacing device of the plastic bottle embryo bottle blowing machine of the present application;

[0030] Figure 2 It is a bottom side perspective view of the support frame of the variable-spacing device of the plastic bottle embryo bottle blowing machine of the present application;

[0031] Figure 3 It is a main view of the cross-sectional structure of the variable-spacing device of the plastic bottle embryo bottle blowing machine of the present application;

[0032] Figure 4 It is an enlarged view of part A of the variable-spacing device of the plastic bottle embryo bottle blowing machine of the present application;

[0033] Figure 5 It is an enlarged view of part B of the variable-spacing device of the plastic bottle embryo bottle blowing machine of the present application.

[0034] In the figure: 1, support frame; 11, first slot; 12, second slot; 13, first bottle blowing mold; 14, second bottle blowing mold; 15, third bottle blowing mold; 16, bottle blowing port; 17, support leg; 2, fixed frame; 21, limiting ring; 22, fixed rod; 24, first spring; 26, servo motor; 27, screw rod; 28, screw rod sleeve; 3, hydraulic cylinder; 31, fixed plate; 32, opening plate; 33, sliding block; 34, sliding groove; 35, second spring; 36, first through groove; 4, electric cylinder; 41, cylinder; 42, piston head; 43, hose; 44, inflatable air bag; 5, limiting frame; 51, limiting block; 52, positioning groove; 53, second through groove. DETAILED DESCRIPTION

[0035] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, not all.

[0036] In the description of the present application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0037] Please refer to Figures 1-3 The present application provides a technical solution: a variable pitch device of a plastic bottle embryo blowing machine, comprising a support frame 1, the upper end inner cavity of the support frame 1 is respectively provided with a first bottle blowing mold 13, a second bottle blowing mold 14 and a third bottle blowing mold 15, both sides of the support frame 1 are welded with support legs 17, a pulling assembly is arranged between the first bottle blowing mold 13, the second bottle blowing mold 14 and the third bottle blowing mold 15, the lower end of the support frame 1 is provided with a fixed plate 31, the upper end of the fixed plate 31 is provided with a variable pitch assembly, the lower end of the fixed plate 31 is provided with an inflation assembly, and one side of the variable pitch assembly is provided with a positioning assembly.

[0038] In the present application, when the pitch is changed, first, the servo motor 26 drives the lead screw 27 to rotate, the lead screw 27 cooperates with the lead screw sleeve 28 to drive the first bottle blowing mold 13 to move, and then cooperates with the fixed rod 22 and the first spring 24 to pull the second bottle blowing mold 14 and the third bottle blowing mold 15 behind the first bottle blowing mold 13 to move, when the first bottle blowing mold 13 is in place, the hydraulic cylinder 3 is opened, the fixed plate 31 is driven by the hydraulic cylinder 3 to move upwards, the opening plate 32 on the fixed plate 31 is inserted between the first bottle blowing mold 13 and the second bottle blowing mold 14 through the first through slot 36, thereby avoiding the problem that inertia will cause the pitch to change when pulling to the position, and then cooperating with the inserted opening plate 32 to block the first bottle blowing mold 13 and the second bottle blowing mold 14, so as to ensure the constant pitch between the first bottle blowing mold 13 and the second bottle blowing mold 14, when it is necessary to adjust the pitch between the first bottle blowing mold 13 and the second bottle blowing mold 14, the piston head 42 is driven by the electric cylinder 4 to move to the right, the air in the cylinder 41 is discharged into the inflatable air bag 44 by the piston head 42, the inflatable air bag 44 is inflated to push the opening plate 32, thereby adjusting the pitch of the opening plate 32, and then adaptively adjusting the variable pitch between the opening plate 32 inserted between the first bottle blowing mold 13 and the second bottle blowing mold 14, at the same time, when the opening plate 32 is in place, the limiting frame 5 on the fixed plate 31 will follow the movement, so that the limiting block 51 on the limiting frame 5 is inserted into the positioning groove 52, thereby limiting the position of the bottle blowing mold moved above the second through slot 53, thereby ensuring the work of the bottle blowing machine, thereby improving the bottle blowing effect.

[0039] In an optional embodiment, the pulling assembly comprises a fixed frame 2, a limiting ring 21, a fixed rod 22, a fixed block, a first spring 24, a servo motor 26, a lead screw 27 and a lead screw 27 sleeve, the front and back sides of the second bottle blowing mold 14 and the third bottle blowing mold 15 are welded with the fixed frame 2, the middle part of the fixed frame 2 is provided with the fixed rod 22 penetrating through, one end of the fixed rod 22 is fixedly installed with the fixed block, one side of the support frame 1 is fixedly installed with the servo motor 26, and the output end of the servo motor 26 is installed with the lead screw 27.

[0040] It should be noted that the first bottle blowing mold 13, the second bottle blowing mold 14 and the third bottle blowing mold 15 are driven to move, thereby facilitating the adjustment and control of the pitch between the first bottle blowing mold 13, the second bottle blowing mold 14 and the third bottle blowing mold 15.

[0041] In an optional embodiment, the variable pitch assembly comprises a hydraulic cylinder 3, a fixed plate 31, a spreading plate 32, a sliding block 33, a sliding groove 34, a second spring 35 and a first through groove 36, the other side of the support frame 1 is provided with the hydraulic cylinder 3, the output end of the hydraulic cylinder 3 is provided with the fixed plate 31, the upper end of the fixed plate 31 is provided with the spreading plate 32, the upper end of the fixed plate 31 is provided with the sliding groove 34 on both sides, the lower end of the spreading plate 32 is fixedly provided with the sliding block 33, and the lower end of the support frame 1 is provided with the first through groove 36.

[0042] It should be noted that the first through groove 36 is arranged to facilitate the insertion of the spreading plate 32 between the two bottle blowing molds during the upward movement of the fixed plate 31, thereby facilitating the pitch control of the bottle blowing molds.

[0043] In an optional embodiment, the inflation assembly comprises an electric cylinder 4, a cylinder body 41, a piston head 42, a hose 43 and an inflatable air bag 44, the lower end of the fixed plate 31 is fixedly provided with the electric cylinder 4, the output end of the electric cylinder 4 is provided with the piston head 42, the side close to the electric cylinder 4 is provided with the cylinder body 41, and the middle part of the two spreading plates 32 is provided with the inflatable air bag 44.

[0044] It should be noted that the inflatable air bag 44 is arranged to adjust the distance between the two spreading plates 32, thereby adjusting the distance between the adjacent two bottle blowing molds during the upward movement of the spreading plate 32.

[0045] In an optional embodiment, one side of the fixed frame 2 is welded with a limiting ring 21, the outer side of the fixed rod 22 is sleeved with a first spring 24, one end of the first spring 24 is fixedly connected with a fixed block, the rear side of the first bottle blowing mold 13, the second bottle blowing mold 14 and the third bottle blowing mold 15 is welded with the fixed block, the fixed block is in sliding connection with the second slot 12, the front end of the first bottle blowing mold 13 is fixedly provided with a lead screw sleeve 28, the size of the lead screw 27 is matched with the size of the lead screw sleeve 28, and the lead screw 27 is in threaded connection with the lead screw sleeve 28.

[0046] It should be noted that the lead screw 27 cooperates with the lead screw sleeve 28 to drive the first bottle blowing mold 13 to move, and the fixed rod 22 and the first spring 24 cooperate to drive the second bottle blowing mold 14 and the third bottle blowing mold 15 behind the first bottle blowing mold 13 to move.

[0047] In an optional embodiment, the size of the sliding block 33 is matched with the size of the sliding groove 34, and the sliding block 33 is in sliding connection with the sliding groove 34, the inner cavity of the sliding groove 34 is fixedly provided with the second spring 35, and the other end of the second spring 35 is fixedly connected with the sliding block 33.

[0048] It should be noted that the second spring 35 is arranged to exert a counterforce on the slider 33 during the movement of the spreading plate 32 to the two sides, thereby facilitating the resetting of the spreading plate 32.

[0049] In an optional embodiment, the upper end of the support frame 1 is provided with a first slot 11 and a second slot 12, and the upper end of the first bottle blowing mold 13, the second bottle blowing mold 14 and the third bottle blowing mold 15 is provided with a bottle blowing port 16.

[0050] It should be noted that the first slot 11 and the second slot 12 cooperate to ensure the stability of the movement of the first bottle blowing mold 13, the second bottle blowing mold 14 and the third bottle blowing mold 15 above the support frame 1.

[0051] In an optional embodiment, the inner cavity of the cylinder 41 is sized to match the size of the piston head 42, and the cylinder 41 is movably connected to the piston head 42. The cylinder 41 is connected to the other end of the hose 43, and the other end of the hose 43 is connected to the air inlet end of the inflatable air bag 44.

[0052] It should be noted that the hose 43 is arranged to guide the air discharged from the cylinder 41, thereby achieving the effect of adjusting the distance between the spreading plates 32.

[0053] In an optional embodiment, the positioning assembly includes a limiting frame 5, a limiting block 51, a positioning slot 52 and a second through slot 53. The upper end of the fixed plate 31 is welded to the limiting frame 5, the upper end of the limiting frame 5 is welded to the limiting block 51, and the lower end of the first bottle blowing mold 13, the second bottle blowing mold 14 and the third bottle blowing mold 15 is provided with the positioning slot 52.

[0054] It should be noted that the second through slot 53 is arranged to facilitate the insertion of the limiting block 51 on the limiting frame 5 into the positioning slot 52 during the movement of the fixed plate 31, thereby achieving the effect of limiting the bottle blowing mold.

[0055] In an optional embodiment, the first through slot 36 is provided with a second through slot 53, and the size of the limiting block 51 matches the size of the positioning slot 52, and the limiting block 51 is movably connected to the positioning slot 52.

[0056] It should be noted that the limiting block 51 and the positioning slot 52 cooperate to limit the position of the bottle blowing mold above the second through slot 53 while adjusting the distance, thereby ensuring the operation of the bottle blowing machine.

[0057] The foregoing merely illustrates the principles of the application and application of its leading features. This application is not limited to the illustrative embodiments shown and described herein. Rather, this application is capable of operating within a further range of conditions and environments than those specifically described herein, and further modifications can be made without departing from the spirit or scope of the application. Accordingly, the description is to be construed as illustrative only and not restrictive of the broad disclosure or application of the application. The specification and drawings are, accordingly, to be regarded simply as illustrative and with the scope of the application being measured by the appended claims, and not with the specification. No admission is made that any reference constitutes prior art. It is my intent, therefore, to be limited only as appears in the following claims.

[0058] Furthermore, it should be understood that although the description above relates to embodiments, not every embodiment contains only one independent technical solution, and the description above is only for the sake of clarity, and those skilled in the art should understand the description as a whole, and the technical solutions in each embodiment can be appropriately combined to form other embodiments that those skilled in the art can understand.

Claims

1. A variable pitch device for a plastic bottle preform stretch blow molding machine comprising a support frame (1) characterized in that: The upper end cavity of the support frame (1) is respectively provided with a first bottle blowing mold (13), a second bottle blowing mold (14) and a third bottle blowing mold (15), both sides of the support frame (1) are welded with support legs (17), a pulling assembly is arranged between the first bottle blowing mold (13), the second bottle blowing mold (14) and the third bottle blowing mold (15), the lower end of the support frame (1) is provided with a fixed plate (31), the upper end of the fixed plate (31) is provided with a variable distance assembly, the lower end of the fixed plate (31) is provided with an inflation assembly, one side of the variable distance assembly is provided with a positioning assembly; the pulling assembly comprises a fixed frame (2), a limiting ring (21), a fixed rod (22), a first spring (24), a servo motor (26), a lead screw (27) and a lead screw sleeve (28), the front and rear sides of the second bottle blowing mold (14) and the third bottle blowing mold (15) are welded with the fixed frame (2), the middle part of the fixed frame (2) is penetratingly provided with the fixed rod (22), one end of the fixed rod (22) is fixedly installed with a fixed block, one side of the support frame (1) is fixedly installed with the servo motor (26), and the output end of the servo motor (26) is installed with the lead screw (27); the variable distance assembly comprises a hydraulic cylinder (3), a fixed plate (31), a strutting plate (32), a sliding block (33), a sliding groove (34), a second spring (35) and a first through groove (36), the other side of the support frame (1) is provided with the hydraulic cylinder (3), the output end of the hydraulic cylinder (3) is installed with the fixed plate (31), the upper end of the fixed plate (31) is provided with the strutting plate (32), the upper end of the fixed plate (31) is provided with the sliding groove (34) on both sides, the lower end of the strutting plate (32) is fixedly installed with the sliding block (33), and the middle part of the lower end of the support frame (1) is provided with the first through groove (36); the inflation assembly comprises an electric cylinder (4), a cylinder body (41), a piston head (42), a hose (43) and an inflatable air bag (44), the lower end of the fixed plate (31) is fixedly installed with the electric cylinder (4), the output end of the electric cylinder (4) is installed with the piston head (42), the side close to the electric cylinder (4) is provided with the cylinder body (41), and the middle parts of the two strutting plates (32) are provided with the inflatable air bag (44); the positioning assembly comprises a limiting frame (5), a limiting block (51), a positioning groove (52) and a second through groove (53), one side of the upper end of the fixed plate (31) is welded with the limiting frame (5), the upper end of the limiting frame (5) is welded with the limiting block (51), and the lower end of the first bottle blowing mold (13), the second bottle blowing mold (14) and the third bottle blowing mold (15) is provided with the positioning groove (52).

2. A stretch rod device for a plastic preform stretch blow molder as set forth in claim 1, further comprising: The side of the fixed frame (2) is welded with a limiting ring (21), the outer side of the fixed rod (22) is sleeved with a first spring (24), one end of the first spring (24) is fixedly connected with a fixed block, the rear side of the first bottle blowing mold (13), the second bottle blowing mold (14) and the third bottle blowing mold (15) is welded with a fixed block, the fixed block is slidably connected with the second strip-shaped groove (12), the front end of the first bottle blowing mold (13) is fixedly installed with a screw rod sleeve (28), the size of the screw rod (27) is matched with the size of the screw rod sleeve (28), and the screw rod (27) is threadedly connected with the screw rod sleeve (28).

3. A stretch rod device for a plastic preform stretch blow molder as set forth in claim 2, wherein: The size of the sliding block (33) is matched with the size of the sliding groove (34), and the sliding block (33) is slidably connected with the sliding groove (34), the inner cavity of the sliding groove (34) is fixedly installed with a second spring (35), and the other end of the second spring (35) is fixedly connected with the sliding block (33).

4. A stretch rod apparatus as claimed in claim 3, wherein: The upper end of the support frame (1) is respectively provided with a first strip-shaped groove (11) and a second strip-shaped groove (12), and the upper end of the first bottle blowing mold (13), the second bottle blowing mold (14) and the third bottle blowing mold (15) is provided with a bottle blowing port (16).

5. A stretch rod apparatus for use in a stretch rod machine as defined in claim 4, wherein: The size of the inner cavity of the cylinder (41) is matched with the size of the piston head (42), and the cylinder (41) is movably connected with the piston head (42), the gas outlet end of the cylinder (41) is communicated with a hose (43), and the other end of the hose (43) is communicated with the air inlet end of the inflatable air bag (44).

6. A stretch rod apparatus for use in a stretch rod machine as defined in claim 1, wherein: The first through groove (36) is provided with a second through groove (53) on one side, the size of the limiting block (51) is matched with the size of the positioning groove (52), and the limiting block (51) is movably connected with the positioning groove (52).

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