PET bottle preform blow molding heating device and method

Abstract

The invention relates to the technical field of blow molding processing equipment, in particular to a PET bottle preform blow molding heating device and method.The PET bottle preform blow molding heating device comprises a base and a heating box, the heating box is fixedly installed at the top of the base, a processing device is arranged in the heating box, and the processing device comprises a conveying mechanism, an adjusting mechanism, a heating mechanism and a blow molding mechanism; the conveying mechanism is arranged in the heating box, the adjusting mechanism is arranged in the heating box, and the heating mechanism is arranged in the heating box. According to the PET bottle preform blow molding heating device and method, the conveying mechanism is arranged, the bottle openings of multiple bottle preforms are placed on the top of the storage disc downwards, a motor is started to drive a belt wheel to rotate, a belt drives a mounting plate to move, the bottle preforms on the storage disc are driven to move when the mounting plate moves, and meanwhile when the bottle preforms move, the bottle preforms on the storage disc are driven to move. And a gear below the rotating shaft is meshed with a tooth block arranged on the meshing block, so that the rotating shaft drives the storage tray and the bottle preform to rotate, all surfaces of the bottle preform are close to the heating wire, and the bottle preform is heated more uniformly.

Description

Technical Field

[0001] The present invention relates to the technical field of blow molding processing equipment, and particularly to a PET preform blow molding heating device and method. Background Art

[0002] In the blow molding process of PET preforms, it is necessary to transfer the PET preforms into a mold. The mold is provided with a heating module to keep the PET preforms at a high temperature. By inserting a blow molding tube into the PET preforms, after blowing the PET preforms into bottles adapted to the shape of the mold, the bottles can be directly demolded and transferred to the next device for cooling treatment.

[0003] The existing device performs blowing and cooling treatment on the handle connection of the preform through a local cooling mechanism. However, during the cooling process of the preform using this method, the cold air blown to the other parts of the preform conflicts with the hot blow molding treatment of the other parts of the preform, resulting in poor hot blow molding treatment effects on the other parts of the preform covered by the cold air, and also damaging the structural consistency of the produced bottles.

[0004] As disclosed in a PET preform blow molding heating device and method with the publication number CN116968298B, a moving mechanism drives the right mold shell and the left mold shell to complete the closing or separating work. The preform is heated and blown between two molds in the right mold shell and the left mold shell to form a bottle. Electromagnets are respectively provided on the right mold shell and the left mold shell. At the initial stage of the separating work driven by the moving mechanism for the right mold shell and the left mold shell, the local cooling mechanism first concentrates on cooling the preset structure area of the bottle to accelerate the cooling and shaping speed at the connection of the bottle and the preset structure. Under the electromagnetic attraction between the mutually adhering electromagnets, the separating time of the two molds is later than the separating time of the right mold shell and the left mold shell, prolonging the cooling and demolding time of the bottle formed by blow molding between the right mold shell and the left mold shell, and enabling the whole bottle to gradually cool down under the cooling treatment of the local cooling mechanism.

[0005] However, this device can only heat a single preform at a time during use, with low processing efficiency and uneven heating, affecting the subsequent blow molding quality of PET preforms.

[0006] Therefore, we urgently need to provide a PET preform blow molding heating device and method. Summary of the Invention

[0007] The purpose of the present invention is to provide a PET preform blow molding heating device and method to solve the problems raised in the above background art.

[0008] To achieve the above object, the present invention provides the following technical solution: a PET preform blow molding heating device, including a base and a heating box, the heating box is fixedly installed on the top of the base, a processing device is arranged inside the heating box, and the processing device includes a transportation mechanism, an adjustment mechanism, a heating mechanism and a blow molding mechanism.

[0009] The transportation mechanism is arranged inside the heating box, the adjustment mechanism is arranged inside the heating box, the heating mechanism is arranged inside the heating box, and the blow molding mechanism is arranged on the right side of the base.

[0010] The transportation mechanism includes a motor, a driving roller, a driven roller, belt pulleys, a belt, a mounting plate, a connecting plate, a rotating shaft, a gear, a placing tray, a preform and an engaging block. The motor is fixedly installed inside the base, the driving roller is fixedly installed at the output end of the motor, the driven roller is rotatably connected inside the base and is located behind the driving roller, the belt pulleys are fixedly installed on the outer sides of the upper ends of the driving roller and the driven roller, the belt is sleeved on the outer sides of the two belt pulleys, the mounting plate is fixedly installed on the outer surface of the belt, the connecting plate is fixedly installed on one side of the mounting plate, the rotating shaft is rotatably connected inside the connecting plate, the gear is fixedly installed on the outer side of the lower end of the rotating shaft, the placing tray is fixedly installed at the top of the rotating shaft, the preform is installed on the top of the placing tray, and the engaging block is fixedly installed at the bottom inside the heating box.

[0011] Preferably, tooth blocks that are meshed with the gear are provided on the outer surface of the engaging block, and the mounting plate is fixedly connected to the belt by bolts. When the belt drives the mounting plate to move, in cooperation with the meshing of the gear and the engaging block, the rotating shaft rotates self - sufficiently, so that the rotating shaft drives the placing tray and the preform on the top to rotate self - sufficiently, making all parts of the preform evenly heated.

[0012] Preferably, the adjustment mechanism includes a first threaded rod, a second threaded rod, a first tightening block and a second tightening block. The first threaded rod is rotatably connected inside the placing tray, the second threaded rod is rotatably connected inside the placing tray and is located at the lower end of the first threaded rod. The first tightening blocks are threadedly connected to the left and right sides of the outer surface of the first threaded rod, and the second tightening blocks are threadedly connected to the front and back sides of the outer surface of the second threaded rod.

[0013] Preferably, the outer surfaces of the first threaded rod and the second threaded rod are provided with external threads in opposite directions, and a cross - shaped sliding groove is provided on the upper surface of the placing tray. The widths of the first tightening block and the second tightening block are equal to the width of the cross - shaped sliding groove. By rotating the first threaded rod and the second threaded rod, the two first tightening blocks and the two second tightening blocks move along the cross - shaped sliding groove, realizing the adjustment of the distance between the two first tightening blocks and the two second tightening blocks, and further tightening the bottle mouth of preforms of different sizes.

[0014] Preferably, the heating mechanism includes a housing, a mounting block, a heating wire, a temperature sensor, and a controller. The housing is fixedly installed inside the heating box. The mounting block is fixedly installed on the front and rear sides of the inner wall of the housing. The heating wire is installed inside the housing. The temperature sensor is installed inside the heating box. The controller is installed on the left side of the front of the base.

[0015] Preferably, mounting holes are provided inside the mounting block. The front and rear ends of the heating wire are installed in the mounting holes, and the heating wire is electrically connected to the controller. The temperature sensor is electrically connected to the controller. The temperature inside the heating box is measured by the temperature sensor, and the measured temperature value is transmitted to the controller. The controller compares and calculates the received temperature sensor signal with a preset temperature value, and then outputs a control signal to adjust the power supply of the heating wire, thereby controlling the heating power of the heating wire.

[0016] Preferably, the blow molding mechanism includes a frame, a fixed mold, a guide rod, a movable mold, a first telescopic member, a bracket, a second telescopic member, a connecting pipe, and a blow pipe. The frame is fixedly installed on the right side of the base. The fixed mold is fixedly installed on the inner wall of the frame. The guide rod is fixedly installed on the upper left and right sides inside the frame. The movable mold is slidably connected to the outside of the guide rod. The first telescopic member is fixedly installed on the front of the frame. The bracket is fixedly installed on the top of the frame. The second telescopic member is fixedly installed on the top of the bracket. The connecting pipe is installed at the bottom of the second telescopic member. The blow pipe is connected to the bottom of the connecting pipe.

[0017] Preferably, the output end of the first telescopic member is fixedly connected to one side of the movable mold. Mold cavities are provided inside the fixed mold and the movable mold. The heated preform is placed inside the movable mold, then the first telescopic member is started to push the movable mold to close with the fixed mold, then the second telescopic member is started to push the blow pipe downward to contact the mouth of the preform, and then an air pump is started to blow mold the preform.

[0018] A PET preform blow molding and heating method includes the following steps: Step 1: Adjust the distance between the two first clamping blocks and the two second clamping blocks according to the size of the preform so that the outer circle formed by the two first clamping blocks and the two second clamping blocks is the same size as the mouth of the preform.

[0019] Step 2: Place the mouths of multiple preforms downward and insert them outside the two first clamping blocks and the two second clamping blocks in sequence to fix the preforms.

[0020] Step 3: Start the motor to drive the belt to convey the preforms, and cooperate with the gear and the engaging block to engage, so that the preforms rotate, so that all sides of the preforms are close to the heating wire, making the preforms heat more evenly.

[0021] Step 4: Remove the heated preform and then place it inside the movable mold.

[0022] Step Five: Start the first telescopic member to push the movable mold to close the mold with the fixed mold.

[0023] Step Six: Start the second telescopic member to push the blow pipe down to contact the mouth of the preform, and then start the air pump to blow-mold the preform.

[0024] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. In this PET preform blow molding and heating device and method, by setting a transportation mechanism, the mouths of multiple preforms are placed downward on the top of the placement tray. Start the motor to drive the pulley to rotate, so that the belt drives the mounting plate to move. When the mounting plate moves, it drives the preforms on the placement tray to move. At the same time, when the preforms move, the gear below the rotating shaft meshes with the tooth blocks opened on the engaging block, so that the rotating shaft drives the placement tray and the preforms to rotate, making each surface of the preforms close to the heating wire, thereby making the preforms heated more evenly.

[0025] 2. In this PET preform blow molding and heating device and method, by setting an adjustment mechanism, the distance between the two first tightening blocks and the two second tightening blocks is adjusted according to the size of the preform, so that the outer circle formed by the two first tightening blocks and the two second tightening blocks is the same size as the mouth of the preform, realizing the tightening of the mouths of preforms of different sizes and improving the practicability of the device.

[0026] 3. In this PET preform blow molding and heating device and method, by setting a heating mechanism, the temperature inside the heating box is measured by a temperature sensor, and the measured temperature value is transmitted to the controller. The controller compares and operates according to the temperature sensor signal received, and then outputs a control signal to adjust the power supply of the heating wire, thereby controlling the heating power of the heating wire. Description of the Drawings

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0028] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a cross-sectional view of the internal structure of the heating box of the present invention; Figure 3 It is a schematic diagram of the structure of the transportation mechanism of the present invention; Figure 4 It is an exploded view of the connection between the placement tray and the preform of the present invention; Figure 5Exploded view of the connection between the storage tray and the adjustment mechanism of the present invention; Figure 6 Schematic structural diagram of the blow molding mechanism of the present invention.

[0029] In the figure: 1, base; 2, heating box; 301, motor; 302, driving roller; 303, driven roller; 304, pulley; 305, belt; 306, mounting plate; 307, connecting plate; 308, rotating shaft; 309, gear; 310, storage tray; 311, preform; 312, meshing block; 401, first threaded rod; 402, second threaded rod; 403, first tightening block; 404, second tightening block; 501, housing; 502, mounting block; 503, heating wire; 504, temperature sensor; 505, controller; 601, frame; 602, fixed mold; 603, guide rod; 604, movable mold; 605, first telescopic member; 606, bracket; 607, second telescopic member; 608, connecting pipe; 609, blow pipe. Detailed implementation manners

[0030] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

[0031] In the present invention, unless otherwise clearly defined and limited, terms such as "installation", "connection", "linkage", "fixation" and the like shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral body; it may be a mechanical connection or an electrical connection; it may be a direct connection or an indirect connection through an intermediate medium, and it may be the internal communication of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] Please refer to Figures 1-6 , the present invention provides a technical solution: a PET preform blow molding and heating device, including a base 1 and a heating box 2. The heating box 2 is fixedly installed on the top of the base 1. The front of the heating box 2 is an opening. The preform 311 can be placed on the top of the storage tray 310 through the opening, and at the same time, the preform 311 can be removed through the opening. A processing device is provided inside the heating box 2, and the processing device includes a transportation mechanism, an adjustment mechanism, a heating mechanism, and a blow molding mechanism.

[0033] The transportation mechanism is arranged inside the heating box 2, the adjustment mechanism is arranged inside the heating box 2, the heating mechanism is arranged inside the heating box 2, and the blow molding mechanism is arranged on the right side of the base 1.

[0034] The transport mechanism includes a motor 301, a driving roller 302, a driven roller 303, a pulley 304, a belt 305, a mounting plate 306, a connecting plate 307, a rotating shaft 308, a gear 309, a placing tray 310, a preform 311, and an engaging block 312. The motor 301 is fixedly installed inside the base 1 and serves as the driving force for the conveyance of the belt 305. The driving roller 302 is fixedly installed at the output end of the motor 301. The driven roller 303 is rotatably connected inside the base 1 and is located behind the driving roller 302. The pulley 304 is fixedly installed on the outer sides of the upper ends of the driving roller 302 and the driven roller 303. The belt 305 is sleeved on the outer sides of the two pulleys 304. The mounting plate 306 is fixedly installed on the outer surface of the belt 305. The connecting plate 307 is fixedly installed on one side of the mounting plate 306. The rotating shaft 308 is rotatably connected inside the connecting plate 307, and the rotating shaft 308 is installed on the connecting plate 307 through a bearing. The gear 309 is fixedly installed on the outer side of the lower end of the rotating shaft 308. The placing tray 310 is fixedly installed on the top of the rotating shaft 308. The number of the placing trays 310 and the mounting plates 306 is multiple, and multiple preforms 311 can be heated simultaneously, improving the heating efficiency. The preforms 311 are installed on the top of the placing trays 310. The engaging block 312 is fixedly installed on the inner bottom of the heating box 2. Tooth blocks that mesh with the gear 309 are provided on the outer surface of the engaging block 312. The mounting plate 306 is fixedly connected to the belt 305 through bolts. When the belt 305 drives the mounting plate 306 to move, in cooperation with the meshing of the gear 309 and the engaging block 312, the rotating shaft 308 rotates self - sufficiently, so that the rotating shaft 308 drives the placing tray 310 and the preforms 311 on the top to rotate self - sufficiently, making all parts of the preforms 311 evenly heated.

[0035] The adjusting mechanism includes a first threaded rod 401, a second threaded rod 402, a first tightening block 403, and a second tightening block 404. The first threaded rod 401 is rotatably connected inside the placing tray 310. Opposite - direction external threads are provided on the outer surfaces of the first threaded rod 401 and the second threaded rod 402, and a cross - shaped sliding groove is provided on the upper surface of the placing tray 310. The widths of the first tightening block 403 and the second tightening block 404 are equal to the width of the cross - shaped sliding groove. By rotating the first threaded rod 401 and the second threaded rod 402, the two first tightening blocks 403 and the two second tightening blocks 404 move along the cross - shaped sliding groove, realizing the adjustment of the distance between the two first tightening blocks 403 and the two second tightening blocks 404, and further tightening the bottle mouths of preforms 311 of different sizes. The second threaded rod 402 is rotatably connected inside the placing tray 310 and is located at the lower end of the first threaded rod 401. The first tightening block 403 is threadedly connected to the left and right sides of the outer surface of the first threaded rod 401. The second tightening block 404 is threadedly connected to the front and back sides of the outer surface of the second threaded rod 402.

[0036] The heating mechanism includes a housing 501, a mounting block 502, a heating wire 503, a temperature sensor 504, and a controller 505. The housing 501 is fixedly installed inside the heating box 2. The mounting block 502 is fixedly installed on the front and rear sides of the inner wall of the housing 501. The heating wire 503 is installed inside the housing 501. Mounting holes are provided inside the mounting block 502. The front and rear ends of the heating wire 503 are installed in the mounting holes, and the heating wire 503 is electrically connected to the controller 505. The temperature sensor 504 is electrically connected to the controller 505. The temperature inside the heating box 2 is measured by the temperature sensor 504, and the measured temperature value is transmitted to the controller 505. The controller 505 compares and calculates the signal of the temperature sensor 504 received with a preset temperature value, and then outputs a control signal to adjust the power supply of the heating wire 503, thereby controlling the heating power of the heating wire 503. The temperature sensor 504 is installed inside the heating box 2, and the controller 505 is installed on the left side of the front of the base 1.

[0037] The blow molding mechanism includes a frame body 601, a fixed mold 602, a guide rod 603, a movable mold 604, a first telescopic member 605, a bracket 606, a second telescopic member 607, a connecting pipe 608, and a blow pipe 609. The frame body 601 is fixedly installed on the right side of the base 1. The fixed mold 602 is fixedly installed on the inner wall of the frame body 601. The guide rod 603 is fixedly installed on the upper left and right sides inside the frame body 601. The movable mold 604 is slidably connected to the outside of the guide rod 603. The first telescopic member 605 is fixedly installed on the front of the frame body 601, and the output end of the first telescopic member 605 is fixedly connected to one side of the movable mold 604. The first telescopic member 605 includes a hydraulic cylinder and a hydraulic rod. The hydraulic cylinder is fixedly installed on the front of the frame body 601, and the hydraulic rod is installed at the output end of the hydraulic cylinder. Mold cavities are provided inside the fixed mold 602 and the movable mold 604. The heated preform 311 is placed inside the movable mold 604, and then the first telescopic member 605 is started to push the movable mold 604 to close with the fixed mold 602. Then the second telescopic member 607 is started to push the blow pipe 609 downward to contact the mouth of the preform 311, and then the air pump is started to blow mold the preform 311. The bracket 606 is fixedly installed on the top of the frame body 601. The second telescopic member 607 is fixedly installed on the top of the bracket 606. The second telescopic member 607 is an electric push rod, with the model XTL, which can control the telescopic length. The connecting pipe 608 is installed at the bottom of the second telescopic member 607. The connecting pipe 608 is connected to the air pump through a pipeline. The model of the air pump is W-1 / 30. The blow pipe 609 is connected to the bottom of the connecting pipe 608.

[0038] A PET preform blow molding and heating method includes the following steps: Step 1: Adjust the distance between the two first clamping blocks 403 and the two second clamping blocks 404 according to the size of the preform 311, so that the outer circle formed by the two first clamping blocks 403 and the two second clamping blocks 404 is the same size as the mouth of the preform 311.

[0039] Step Two: Turn the mouths of multiple preforms 311 downward and insert them in sequence outside two first clamping blocks 403 and two second clamping blocks 404 to fix the preforms 311.

[0040] Step Three: Start the motor 301 to drive the belt 305 to convey the preforms 311, and cooperate with the gear 309 meshing with the engaging block 312 to make the preforms 311 rotate self - sufficiently, so that all surfaces of the preforms 311 are close to the heating wire 503, making the preforms 311 heated more evenly.

[0041] Step Four: Remove the heated preforms 311 and then put them into the movable mold 604.

[0042] Step Five: Start the first telescopic member 605 to push the movable mold 604 to close with the fixed mold 602.

[0043] Step Six: Start the second telescopic member 607 to push the blow - pipe 609 downward to contact the mouth of the preform 311, and then start the air pump to blow - mold the preform 311.

[0044] When in use, adjust the distance between the two first clamping blocks 403 and the two second clamping blocks 404 according to the size of the preforms 311, so that the outer circle formed by the two first clamping blocks 403 and the two second clamping blocks 404 is the same size as the mouth of the preform 311. By rotating the first threaded rod 401 and the second threaded rod 402 which are respectively thread - connected to the first clamping block 403 and the second clamping block 404, the two first clamping blocks 403 and the two second clamping blocks 404 move along the cross - shaped sliding groove to the appropriate positions. Then turn the mouths of multiple preforms 311 downward and insert them in sequence outside the two first clamping blocks 403 and the two second clamping blocks 404 to fix the preforms 311. Then energize the heating wire 503 through the power supply to make the heating wire 503 generate heat to heat the preforms 311. Then start the motor 301 to drive the pulley 304 to rotate, so that the belt 305 drives the mounting plate 306 to move. When the mounting plate 306 moves, it drives the preforms 311 on the placement tray 310 to move. At the same time, when the preforms 311 move, the gear 309 below the rotating shaft 308 meshes with the tooth block opened on the engaging block 312, so that the rotating shaft 308 drives the placement tray 310 and the preforms 311 to rotate self - sufficiently, making all surfaces of the preforms 311 close to the heating wire 503, so that the preforms 311 are heated more evenly. After heating is completed, remove the preforms 311 and put them into the movable mold 604. Then start the first telescopic member 605 to push the movable mold 604 to close with the fixed mold 602. Then start the second telescopic member 607 to push the blow - pipe 609 downward to contact the mouth of the preform 311, and then start the air pump to make the gas blow out from the blow - pipe 609 through the connecting pipe 608 to blow - mold the preform 311.

[0045] It should be noted that in this text, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprising", "including" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising an..." does not exclude the presence of additional identical elements in the process, method, article or device comprising said element.

[0046] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A PET preform blow molding heating device, comprising a base (1) and a heating box (2), the heating box (2) is fixedly installed on the top of the base (1), and is characterized in that: Inside the heating box (2), a processing device is provided, and the processing device includes a transportation mechanism, an adjustment mechanism, a heating mechanism, and a blow molding mechanism; The transportation mechanism is arranged inside the heating box (2), the adjustment mechanism is arranged inside the heating box (2), the heating mechanism is arranged inside the heating box (2), and the blow molding mechanism is arranged on the right side of the base (1); The transportation mechanism includes a motor (301), a driving roller (302), a driven roller (303), a pulley (304), a belt (305), a mounting plate (306), a connecting plate (307), a rotating shaft (308), a gear (309), a placing tray (310), a preform (311), and an engaging block (312). The motor (301) is fixedly installed inside the base (1), the driving roller (302) is fixedly installed at the output end of the motor (301), the driven roller (303) is rotatably connected inside the base (1) and is located behind the driving roller (302), the pulley (304) is fixedly installed on the outer sides of the upper ends of the driving roller (302) and the driven roller (303), the belt (305) is sleeved on the outer sides of the two pulleys (304), the mounting plate (306) is fixedly installed on the outer surface of the belt (305), the connecting plate (307) is fixedly installed on one side of the mounting plate (306), the rotating shaft (308) is rotatably connected inside the connecting plate (307), the gear (309) is fixedly installed on the outer side of the lower end of the rotating shaft (308), the placing tray (310) is fixedly installed on the top of the rotating shaft (308), the preform (311) is installed on the top of the placing tray (310), and the engaging block (312) is fixedly installed on the inner bottom of the heating box (2).

2. A PET preform blow molding heating device according to claim 1, characterized in that: On the outer surface of the engaging block (312), tooth blocks that mesh with the gear (309) are provided, and the mounting plate (306) is fixedly connected to the belt (305) by bolts.

3. A PET preform blow molding heating device according to claim 1, characterized in that: The adjustment mechanism includes a first threaded rod (401), a second threaded rod (402), a first tightening block (403), and a second tightening block (404). The first threaded rod (401) is rotatably connected inside the placing tray (310), the second threaded rod (402) is rotatably connected inside the placing tray (310) and is located below the first threaded rod (401), the first tightening block (403) is threadedly connected to the left and right sides of the outer surface of the first threaded rod (401), and the second tightening block (404) is threadedly connected to the front and back sides of the outer surface of the second threaded rod (402).

4. A PET preform blow molding heating device according to claim 3, characterized in that: The outer surfaces of the first threaded rod (401) and the second threaded rod (402) are provided with external threads in opposite directions, and a cross-shaped sliding groove is provided on the upper surface of the placing tray (310). The widths of the first tightening block (403) and the second tightening block (404) are equal to the width of the cross-shaped sliding groove.

5. A PET preform blow molding heating device according to claim 1, characterized in that: The heating mechanism includes a housing (501), a mounting block (502), a heating wire (503), a temperature sensor (504), and a controller (505). The housing (501) is fixedly installed inside the heating box (2). The mounting block (502) is fixedly installed on the front and rear sides of the inner wall of the housing (501). The heating wire (503) is installed inside the housing (501). The temperature sensor (504) is installed inside the heating box (2). The controller (505) is installed on the left side of the front of the base (1).

6. The PET preform blow molding heating device according to claim 5, characterized in that: Mounting holes are formed inside the mounting block (502). The front and rear ends of the heating wire (503) are installed in the mounting holes, and the heating wire (503) is electrically connected to the controller (505). The temperature sensor (504) is electrically connected to the controller (505).

7. A PET preform blow molding heating device according to claim 1, characterized in that: The blow molding mechanism includes a frame body (601), a fixed mold (602), a guide rod (603), a movable mold (604), a first telescopic member (605), a bracket (606), a second telescopic member (607), a connecting pipe (608), and a blow pipe (609). The frame body (601) is fixedly installed on the right side of the base (1). The fixed mold (602) is fixedly installed on the inner wall of the frame body (601). The guide rod (603) is fixedly installed on the upper left and right sides inside the frame body (601). The movable mold (604) is slidably connected to the outside of the guide rod (603). The first telescopic member (605) is fixedly installed on the front of the frame body (601). The bracket (606) is fixedly installed on the top of the frame body (601). The second telescopic member (607) is fixedly installed on the top of the bracket (606). The connecting pipe (608) is installed at the bottom of the second telescopic member (607). The blow pipe (609) is connected to the bottom of the connecting pipe (608).

8. A PET preform blow molding heating device according to claim 7, characterized in that: The output end of the first telescopic member (605) is fixedly connected to one side of the movable mold (604). Mold cavities are formed inside the fixed mold (602) and the movable mold (604).

9. A method for blow molding and heating a PET preform according to any one of claims 1 - 8, characterized in that: It includes the following steps: Step 1: Adjust the distance between the two first clamping blocks (403) and the two second clamping blocks (404) according to the size of the preform (311) so that the outer circle formed by the two first clamping blocks (403) and the two second clamping blocks (404) is the same size as the mouth of the preform (311). Step 2: Insert the mouths of multiple preforms (311) downward in sequence outside the two first clamping blocks (403) and the two second clamping blocks (404) to fix the preforms (311). Step 3: Start the motor (301) to drive the belt (305) to convey the preform 311, and cooperate with the gear (309) meshing with the engaging block (312) to make the preform (311) rotate, so that all surfaces of the preform (311) are close to the heating wire (503), making the preform (311) heat more evenly. Step 4: Remove the heated preform (311) and then place it into the movable mold (604). Step 5: Start the first telescopic member (605) to push the movable mold (604) to close the mold with the fixed mold (602). Step 6: Activate the second telescopic member (607) to push the blow tube (609) downward to contact the mouth of the preform (311), and then activate the air pump to blow mold the preform (311).

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