Heating device for bottle blowing machine

Abstract

The utility model relates to a heating device for a bottle blowing machine. A transmission part of an existing heating device is fixedly connected with a blank inserting rod, and the use experience is affected. The automatic blank inserting device comprises a rack, a drying oven and a conveying mechanism, the conveying mechanism comprises a revolution chain and a blank inserting assembly, the blank inserting assembly comprises a shell and a blank inserting rod, a transmission part with a lantern ring is arranged in the middle of the blank inserting rod, a limiting ring is arranged on the blank inserting rod, and the transmission part is stressed to rise and tightly abuts against the limiting ring through the lantern ring. And the blank inserting rod is driven to be lifted from a blank inserting state to a blank removing state and is limited to rotate. The blank inserting rod is sleeved with the transmission part through the lantern ring, the effect of lifting and driving the blank inserting rod is achieved, it is guaranteed that the blank inserting rod can freely rotate in the lantern ring in the blank inserting state, it is guaranteed that the blank inserting rod can be tightly attached to the limiting ring in the blank removing state, and rotation of the blank inserting rod in the lantern ring is limited by increasing friction force between the blank inserting rod and the limiting ring.

Description

Technical Field

[0001] This utility model relates to the field of plastic processing, specifically to a heating device for a blow molding machine. Background Technology

[0002] Existing blow molding machines include a heating device, a conveying device, and a blow molding assembly. The heating device softens the preform, and the conveying device transfers the preforms from the heating device to the blow molding assembly, which blows the preforms into bottles. The heating device includes a frame, an oven mounted on the frame, and a conveying mechanism. The conveying mechanism includes a circular revolving chain and preform insertion assemblies evenly spaced on the chain. Each preform insertion assembly includes a housing and a preform insertion rod that is vertically adjustable within the housing. The preform insertion rod switches between a preform insertion state (insertion of the plug into the preform) and a preform removal state (removal of the plug from the preform) by raising and lowering. Existing preform insertion rods have fixed transmission components that drive the rod's raising and lowering. However, the rod cannot rotate due to obstruction from these components, forcing the preforms conveyed by the rod to pass through the oven in a fixed posture. This results in uneven heating of the preforms, affecting blow molding quality, increasing scrap rates, raising processing costs, and negatively impacting the user experience. Utility Model Content

[0003] To address the shortcomings of existing technologies, this utility model provides a heating device for a blow molding machine. The transmission component is fitted onto the preform insert rod via a collar. This collar, in conjunction with a limiting ring, lifts and drives the preform insert rod, while also ensuring that the rod can rotate freely within the collar. This ensures that the preform is heated evenly in the oven, guaranteeing blow molding quality and improving the user experience.

[0004] This utility model is achieved through the following means: a heating device for a blow molding machine, including a frame and an oven and a conveying mechanism mounted on the frame. The conveying mechanism includes a ring-shaped revolving chain and inserting assemblies equidistantly distributed on the revolving chain. The inserting assembly includes a housing fixedly connected to the revolving chain and an inserting rod that is vertically and flexibly mounted inside the housing. The inserting rod has a transmission component with a collar in the middle and a limiting ring on the inserting rod. The transmission component rises under force and closely abuts against the limiting ring through the collar, thereby driving the inserting rod to rise from the inserting state to the uninserting state and restricting the rotation of the inserting rod. The transmission component is fitted onto the insert rod via a collar. The collar, in contact with the limiting ring, lifts and drives the insert rod, allowing it to switch between inserting and removing preforms. It also ensures the insert rod can rotate freely within the collar when in the inserting state, guaranteeing uniform heating of the preform in the oven, ensuring blow molding quality, and improving the user experience. Furthermore, when in the removing state, the insert rod is tightly fitted with the limiting ring, increasing friction between them to restrict rotation within the collar, effectively reducing wear and extending service life.

[0005] Preferably, a vertical groove is formed on the side wall of the outer casing, and the transmission component is elongated. One end of the transmission component passes through the vertical groove and is exposed to form a force-bearing end, while the other end is provided with a collar that can be fitted onto the insert rod. The transmission component is lifted by the force-bearing end and drives the insert rod to rise by pushing the limiting ring through the collar. The vertical groove provides a passage for the force-bearing end of the transmission component to pass through and be exposed to the outer casing to receive external driving force, ensuring that the insert rod can be lifted under the control of the transmission component. It also provides lifting space for the transmission component, facilitating the lifting of the insert rod by the transmission component rising and disengaging from the limiting ring by the transmission component falling, and ensuring that the insert rod can rotate freely within the collar.

[0006] Preferably, the vertical distance of the elongated groove is greater than the lifting distance of the insert rod, ensuring that the transmission component can move freely up and down within the elongated groove and meet the lifting amplitude requirements of the insert rod, thereby achieving precise switching between the insert state and the uninsertion state and improving the reliability of the uninsertion action and the insert action.

[0007] Preferably, the inner diameter of the collar is between the outer diameter of the insert rod and the outer diameter of the bottom surface of the limiting ring, so as to form an movable gap between the outer wall of the insert rod and the inner wall of the collar for the insert rod to move freely up and down. This ensures that the collar can move relative to the insert rod and abut against the bottom surface of the limiting ring after being raised, driving the insert rod to switch to the blank removal state and limiting the rotation of the insert rod relative to the collar. It also ensures that the insert rod falls back to the blank removal state under the drive of the return spring when the transmission component falls to the bottom of the vertical groove. The movable gap reserved between the collar and the insert rod ensures that the insert rod can rotate under the drive of the rotating chain.

[0008] Preferably, the outer wall of the insert rod is provided with an annular groove, and the limiting ring is fixed in the groove by a retaining spring, so that the limiting ring is firmly connected to the insert rod. The limiting ring is fixed in the groove by the retaining spring, which not only effectively transmits the lifting force from the collar, ensuring that the lifting action of the insert rod is sensitive, accurate and reliable, but also limits the range of movement of the collar on the insert rod, thereby improving the user experience.

[0009] Preferably, the insert rod has an abutment ring located above the limiting ring at its middle section. The housing has a through hole for vertical lifting and lowering of the insert rod. A return spring is fitted onto the upper part of the insert rod, and the return spring is engaged between the top edge of the through hole and the abutment ring. When the insert rod is lifted, the return spring is compressed and accumulates a preload force to return the insert rod to the insert state, ensuring tight contact between the limiting ring and the collar and restricting relative rotation. The return spring is fitted onto the upper section of the insert rod, with its top end contacting the top of the housing and its bottom end contacting the abutment ring. This allows the return spring to be clamped by the top of the housing and the abutment ring, exerting a pushing force on the insert rod. This ensures that the insert rod is always subjected to the force required to switch to the insert state, effectively increasing the friction between the limiting ring and the collar, thereby limiting relative rotation between the insert rod and the collar when switching to the uninsertion state.

[0010] Preferably, the rotating chain is equipped with a receiving station and a feeding station, dividing the chain into a heating section that traverses the oven and a recirculation section away from the oven. The rotating chain is circular. When the insert rod moves to the receiving station, it switches to the inserting state, ensuring the plug can be inserted downwards into the preform. When it moves to the feeding station, it switches to the detaching state, ensuring the plug can detach upwards from the preform. After switching to the inserting state, the insert rod carries the preform through the oven along the heating section, completing the heating and softening process. Moving along the recirculation section ensures the insert rod can re-enter the receiving station to receive the preform and also cools the rod, preventing deformation of the preform opening due to excessive temperature.

[0011] Preferably, the transmission component has a rotatable guide wheel at the force-bearing end, with the axis of the guide wheel along the length of the transmission component. The frame has a guide rail along the rewind section, and the top surface of the guide rail near the billet feeding station has an inclined guide surface. The guide wheel rolls upward along the guide surface and drives the billet insertion rod to the billet removal state via the transmission component. The guide rail's arrangement along the rewind section allows for an inclined guide surface at its front end, which in turn drives the transmission component to rise, thus achieving the purpose of switching the billet insertion rod from the billet feeding station to the billet removal state. The guide wheel rolls along the track, ensuring the billet insertion rod remains in the billet removal state throughout the rewind section. When the billet insertion rod moves to the billet receiving station, the guide wheel disengages from the guide rail, allowing the billet insertion rod to switch to the billet insertion state under the action of a return spring. This ensures the plug is inserted downwards into the bottle billet, enabling the billet insertion rod to achieve cyclical transfer of the bottle billet as it moves along the revolving chain.

[0012] Preferably, the outer shell is a split structure, comprising an upper shell, a lower shell, and a shell base that are coaxially stacked from top to bottom. The vertical slot is provided on the side wall of the lower shell facing the guide rail. The split processing and assembly simplifies production and reduces production costs.

[0013] Preferably, the side wall of the upper shell has an opening for exposing the upper part of the insert rod. This allows for observation of the inside of the insert rod, effectively reduces the weight of the upper shell and the amount of raw materials used, and also effectively dissipates heat, thereby ensuring that the insert rod is kept at a lower temperature and extending the single-run time.

[0014] Preferably, the housing is inserted and fixed to the bottom of the lower housing, and the bottom of the insert rod is provided with a plug that can be plugged and unplugged with the preform. The plug can move downward and be exposed below the housing when the insert rod box switches between insert and preform states. The housing is made of high-temperature resistant material, which not only effectively blocks heat transfer to the lower and upper housings, but also provides a hidden space for the plug, thus protecting the plug.

[0015] Preferably, the frame is equipped with a rotating chain laid along the heating zone, and the top of the insert rod is equipped with a rotating gear. When the insert rod switches to the inserting state and moves along the heating zone under the drive of the rotating chain, the rotating gear meshes with the rotating chain and drives the insert rod to rotate within the outer shell. The rotating chain can drive the insert rod located in the heating zone to rotate, so that the insert rod drives the preform to rotate, ensuring that the preform can be evenly heated in all areas of the oven through rotation, thereby ensuring the quality of bottle blowing. Since the rotating chain is not laid in the rotation zone, the insert rod in the rotation zone will not rotate, effectively preventing wear between the insert rod and the collar.

[0016] Preferably, the revolving chain has a spring-loaded roller above the receiving station. Driven by the spring, the roller presses downwards on the insert rod passing through the receiving station, causing the insert rod to descend and switch to the inserting state. The roller can be reset downwards under the spring's drive, serving as a reset detection and secondary reset function for the insert rod passing through the receiving station. This ensures that the insert rod can be reset to the inserting state using the roller when the reset spring fails, thereby ensuring that the insert rod can be smoothly inserted into the corresponding preform at the receiving station and transferred to the decanting station through the heating section.

[0017] The beneficial effects of this utility model are as follows: The transmission component is sleeved on the insert rod via a collar. The collar and the limiting ring engage in a repulsive contact, which lifts and drives the insert rod, allowing it to switch from inserting to removing the preform. It also ensures that the insert rod can rotate freely within the collar when in the inserting state, thus ensuring uniform heating of the preform in the oven, guaranteeing blow molding quality, and improving the user experience. Furthermore, it ensures that the insert rod is tightly fitted with the limiting ring when in the removing state, increasing the friction between them to restrict the insertion rod's rotation within the collar, thereby effectively reducing wear and extending service life. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of the heating device;

[0019] Figure 2 This is a schematic diagram of the assembly structure of the transfer section;

[0020] Figure 3 This is a schematic diagram of the assembly structure of the guide rail;

[0021] Figure 4 This is a schematic diagram of the structure of the insert assembly;

[0022] Figure 5 This is a cross-sectional view of the blank assembly;

[0023] Figure 6 This is a schematic diagram of the disassembled structure of the insert assembly;

[0024] In the diagram: 1. Frame, 2. Oven, 3. Revolutionary chain, 4. Blank insertion assembly, 5. Blank insertion rod, 6. Transmission component, 7. Collar, 8. Limiting ring, 9. Vertical groove, 10. Snap ring, 11. Contact ring, 12. Return spring, 13. Guide wheel, 14. Guide rail, 15. Guide surface, 16. Upper shell, 17. Lower shell, 18. Shell base, 19. Rotating chain, 20. Rotating gear, 21. Rolling wheel, 22. Spring. Detailed Implementation

[0025] The essential features of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.

[0026] like Figure 1 and 2 A heating device for a blow molding machine is shown, including a frame 1, an oven 2 and a conveying mechanism mounted on the frame 1. The conveying mechanism includes a ring-shaped revolving chain 3 and inserting assemblies 4 equidistantly distributed on the revolving chain 3. The inserting assembly 4 includes a housing fixedly connected to the revolving chain 3 and an inserting rod 5 vertically mounted inside the housing. The inserting rod 5 has a transmission member 6 with a collar 7 in the middle. The inserting rod 5 has a limiting ring 8. The transmission member 6 rises under force and closely abuts against the limiting ring 8 through the collar 7, thereby driving the inserting rod 5 from the inserting state to the uninserting state and restricting the rotation of the inserting rod 5. The transmission component 6 is sleeved on the insert rod 5 via a collar 7. The collar 7 and the limiting ring 8 engage in abutment to lift and drive the insert rod 5, allowing it to switch from inserting to removing the preform. It also ensures that the insert rod 5 can rotate freely within the collar 7 when in the inserting state, thus ensuring that the preform is heated evenly in the oven 2, ensuring the quality of bottle blowing and improving the user experience. Furthermore, it ensures that the insert rod 5 fits tightly against the limiting ring 8 when in the removing state, increasing the friction between them to restrict the rotation of the insert rod 5 within the collar 7, thereby effectively reducing wear and extending service life.

[0027] In actual operation, the revolving chain 3 is equipped with a receiving station and a feeding station, so that the revolving chain 3 is divided into a heating section that passes through the oven 2 and a reversing section that is away from the oven 2 by the receiving station and the feeding station. The preform insertion assembly 4 is densely arranged along the revolving chain 3, so that the preform insertion assembly 4 can move cyclically along the circular path driven by the revolving chain 3, thereby continuously conveying the bottle preform and completing the heating and softening operation. Specifically, when the insert rod 5 moves to the receiving station, it switches to the inserting state, the plug moves downward and inserts into the bottle preform, allowing the bottle preform to move synchronously with the insert rod 5. Driven by the revolving chain 3, the insert rod 5 moves along the heating section to the unpacking station. The bottle preform passes through the oven 2 and is heated and softened. When the insert rod 5 moves to the unpacking station, it switches to the unpacking state, the bottle preform is vertically clamped and positioned by the unpacking component, and the plug is pulled upward to separate the bottle preform from the insert rod 5. The insert rod 5 remains in the unpacking state and moves along the revolving section to the receiving station to receive the bottle preform again. By cyclically implementing the above process, the bottle preform is circulated and transported, effectively improving processing efficiency.

[0028] In actual operation, a vertical groove 9 is formed on the side wall of the outer shell (e.g., Figure 4 As shown, the transmission component 6 is elongated, with one end extending through the vertical groove 9 and forming a force-bearing end. The other end is provided with a collar 7 that can be fitted onto the insert rod 5. The transmission component 6 is lifted by the force-bearing end and pushes the limiting ring 8 through the collar 7 to drive the insert rod 5 to rise. The vertical distance of the vertical groove 9 is greater than the lifting distance of the insert rod 5, so that the height range of the vertical groove 9 meets the lifting amplitude requirements of the transmission component 6. This ensures that when the transmission component 6 moves upward along the vertical groove 9, it can push the insert rod 5 to the uninserted state where the plug is separated from the preform. It also ensures that the transmission component 6 can descend after the guide wheel 13 is separated from the guide rail 14, and ensures that the insert rod 5 will not collide with the collar 7 when it is in the inserting state, facilitating the rotation of the insert rod 5.

[0029] In actual operation, the inner diameter of the collar 7 is between the outer diameter of the insert rod 5 and the outer diameter of the bottom surface of the limiting ring 8, so as to form an movable gap between the outer wall of the insert rod 5 and the inner wall of the collar 7, allowing the insert rod 5 to move freely up and down. The movable gap between the outer wall of the insert rod 5 and the inner wall of the collar 7, when the insert rod 5 and the collar 7 are coaxially arranged, forms an annular gap, ensuring that the insert rod 5 can rotate freely within the collar 7 without mutual interference, effectively avoiding wear and extending its service life. When the collar 7 rises with the transmission component 6, the top surface of the collar 7 will abut against the bottom surface of the limiting ring 8, thereby driving the insert rod 5 upward, switching the insert rod 5 from the inserting state to the uninserting state. Because the force-bearing end of the transmission component 6 will tilt slightly when subjected to force, causing local contact between the inner wall of the collar 7 and the outer wall of the insert rod 5, frictional loss is reduced by limiting the rotation of the insert rod 5, ensuring the service life of the insert rod 5 and the collar 7.

[0030] In actual operation, the outer wall of the insert rod 5 is provided with an annular groove, and the limiting ring 8 is fixed in the groove by the retaining spring 10 so that the limiting ring 8 is firmly connected to the insert rod 5. This not only facilitates the disassembly and maintenance of the limiting ring 8, but also effectively improves the fixed connection reliability of the limiting ring 8 and prevents the limiting ring 8 from being damaged due to long-term impact from the collar 7.

[0031] In actual operation, the middle part of the insert rod 5 is provided with an abutment ring 11 above the limiting ring 8 (e.g., Figure 5 As shown, the outer casing has a through hole for the vertical lifting and lowering of the insert rod 5. A return spring 12 is sleeved on the upper part of the insert rod 5. The return spring 12 is locked between the top edge of the through hole and the abutment ring 11. When the insert rod 5 is lifted, the return spring 12 is compressed and accumulates a preload force to drive the insert rod 5 back to the insert state, so that the limiting ring 8 and the collar 7 are in tight contact and their relative rotation is restricted. The outer casing is tubular and has a through hole running along its axis, which facilitates the lifting and lowering of the insert rod 5 and also facilitates assembly. The top edge of the through hole extends inward to form a retaining ring. The inner edge of the retaining ring is larger than the diameter of the upper outer wall of the insert rod 5, ensuring that the insert rod 5 can smoothly pass through the retaining ring and move up and down. During installation, the return spring 12 is sleeved on the insert rod 5. The return spring 12 is locked and limited by the retaining ring and the abutment ring 11. Since the outer shell is fixed to the revolving chain 3, the height of the outer shell cannot be adjusted. When the insert rod 5 is subjected to force to rise and fall, the return spring 12 will use its own deformation preload to drive the insert rod 5 to reset, ensuring that the insert rod 5 is reset to the insert state.

[0032] In actual operation, the force-bearing end of the transmission component 6 is provided with a rotatable guide wheel 13, the axis of which is arranged along the length of the transmission component 6. The frame 1 is provided with a guide rail 14 arranged along the turning section, and the top surface of the guide rail 14 near the blank feeding station end is provided with an inclined guide surface 15 (e.g., Figure 3 As shown, the guide wheel 13 rolls upward along the guide surface 15 and drives the insert rod 5 to the uninsertion state through the transmission member 6. The guide wheel 13 is rotatably mounted on the force-receiving end of the transmission member 6. The guide wheel 13 can be used to receive external driving force, thereby driving the insert rod 5 to rise to the uninsertion state, and can also use its own rotation to counteract the friction between it and the guide rail 14, thereby reducing friction loss.

[0033] In actual operation, the outer shell is a split structure, including an upper shell 16, a lower shell 17, and a shell base 18 stacked coaxially from top to bottom (e.g., ...). Figure 6As shown, the vertical groove 9 is provided on the side wall of the lower shell 17 facing the guide rail 14. The side wall of the upper shell 16 has an opening for the upper part of the insert rod 5 to be exposed. The shell seat 18 is inserted and fixed to the bottom of the lower shell 17. The bottom of the insert rod 5 is provided with a plug that can be connected to the preform insertion. The plug can move downward and be exposed below the shell seat 18 when the insert rod 5 switches between inserting and preform insertion states.

[0034] In actual operation, the frame 1 is equipped with a rotating chain 19 laid along the heating section, and the top of the insert rod 5 is equipped with a rotating gear 20. When the insert rod 5 switches to the inserting state and moves along the heating section under the drive of the revolving chain 3, the rotating gear 20 meshes with the rotating chain 19 and drives the insert rod 5 to rotate within the outer shell. When the insert rod 5 moves to the heating section and switches to the inserting position, the rotating gear 20 and the rotating chain 19 are at the same height and can mesh with each other, so that the insert rod 5 can drive the preform to rotate under the drive of the rotating chain 19.

[0035] In actual operation, a rolling roller 21 with a spring 22 is provided above the receiving station of the revolving chain 3. Driven by the spring 22, the rolling roller 21 presses down on the insert rod 5 passing through the receiving station, so that the insert rod 5 descends and switches to the insert state. The rolling roller 21 is located at the bottom of the spring 22, and the top of the spring 22 is fixed to the frame 1, so that the rolling roller 21 can be vertically adjusted and drive the spring 22 to extend and retract. The rolling roller 21 can push the insert rod 5 downward, ensuring that the insert rod 5 can move downward smoothly and switch to the insert state when it moves to the receiving station. It can play a detection role when the reset spring 12 of the insert assembly 4 is effective, and it can also play a safety role when the reset spring 12 of the insert assembly 4 fails, ensuring that the insert rod 5 can switch to the insert state smoothly.

Claims

1. A heating device for a blow molding machine, comprising a frame (1), an oven (2) and a conveying mechanism mounted on the frame (1), the conveying mechanism comprising a ring-shaped revolving chain (3) and blank insert assemblies (4) equidistantly distributed on the revolving chain (3), characterized in that, The blank insertion assembly (4) includes a housing fixedly connected to the revolution chain (3) and a blank insertion rod (5) that can be raised and lowered inside the housing. The blank insertion rod (5) has a transmission component (6) with a collar (7) in the middle. The blank insertion rod (5) is provided with a limiting ring (8). The transmission component (6) is raised under force and closely abuts against the limiting ring (8) through the collar (7) to drive the blank insertion rod (5) to rise from the blank insertion state to the blank removal state and restrict the rotation of the blank insertion rod (5).

2. A heating device for a bottle blowing machine according to claim 1, characterized in that The outer shell has a vertical groove (9) on its side wall. The transmission component (6) is long and narrow. One end of the transmission component (6) passes through the vertical groove (9) and is exposed to form a force-bearing end. The other end is provided with a collar (7) that can be fitted onto the blank insert rod (5). The transmission component (6) is lifted by the force-bearing end and pushes the limiting ring (8) through the collar (7) to drive the blank insert rod (5) to lift.

3. A heating device for a bottle blowing machine according to claim 2, characterized in that The vertical distance of the vertical groove (9) is greater than the lifting distance of the insert rod (5); or, the inner diameter of the collar (7) is between the outer diameter of the insert rod (5) and the outer diameter of the bottom surface of the limiting ring (8), so as to form an movable gap between the outer wall of the insert rod (5) and the inner wall of the collar (7) for the insert rod (5) to lift freely; or, the outer wall of the insert rod (5) is provided with an annular groove, and the limiting ring (8) is fixed in the groove by a retaining spring (10) so as to firmly connect the limiting ring (8) with the insert rod (5).

4. A heating device for a bottle blowing machine according to claim 2, characterized in that The insert rod (5) is provided with an abutment ring (11) in the middle above the limiting ring (8). The outer shell is provided with a through hole for the insert rod (5) to move vertically. A return spring (12) is sleeved on the upper part of the insert rod (5). The return spring (12) is locked between the top edge of the through hole and the abutment ring (11). When the insert rod (5) is raised, the return spring (12) is compressed and accumulates a preload force to drive the insert rod (5) back to the insert state, so that the limiting ring (8) and the collar (7) are in close contact and the relative rotation is restricted.

5. A heating device for a bottle blowing machine according to any one of claims 2 to 4, characterized in that The revolving chain (3) is provided with a receiving station and a feeding station, so that the revolving chain (3) is divided into a heating section that passes through the oven (2) and a reversing section that is away from the oven (2) by the receiving station and the feeding station.

6. A heating device for a bottle blowing machine according to claim 5, characterized in that The transmission component (6) has a rotatable guide wheel (13) at the force-bearing end. The axis of the guide wheel (13) is set along the length direction of the transmission component (6). The frame (1) is provided with a guide rail (14) set along the turning section. The top surface of the guide rail (14) near the billet feeding station end is provided with an inclined guide surface (15). The guide wheel (13) rolls up along the guide surface (15) and drives the billet insertion rod (5) to change to the billet removal state through the transmission component (6).

7. A heating device for a bottle blowing machine according to claim 6, characterized in that The outer shell is a split structure, including an upper shell (16), a lower shell (17) and a shell base (18) stacked coaxially from top to bottom. The vertical groove (9) is provided on the side wall of the lower shell (17) facing the guide rail (14).

8. A heating device for a bottle blowing machine according to claim 7, characterized in that The upper shell (16) has an opening on its side wall for the upper part of the insert rod (5) to be exposed; or, the shell base (18) is inserted and fixed to the bottom of the lower shell (17), and the bottom of the insert rod (5) is provided with a plug that can be connected to the insert rod. The plug can move downward and be exposed below the shell base (18) when the insert rod (5) switches to the insert state.

9. A heating device for a bottle blowing machine according to any one of claims 1 to 4, characterized in that The frame (1) is provided with a rotating chain (19) laid along the heating section. The top of the insert rod (5) is provided with a rotating gear (20). When the insert rod (5) switches to the insert state and moves along the heating section under the drive of the revolving chain (3), the rotating gear (20) meshes with the rotating chain (19) and drives the insert rod (5) to rotate inside the shell.

10. A heating device for a bottle blowing machine according to any one of claims 1 to 4, characterized in that Above the receiving station of the revolution chain (3) is a rolling wheel (21) with a spring (22). Driven by the spring (22), the rolling wheel (21) presses down on the insert rod (5) passing through the receiving station, so that the insert rod (5) switches to the insert state.

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