Clamping device for a plastic bottle blow molding machine
By introducing a ring-shaped sliding plate and a displacement mechanism into the clamping device of a plastic bottle blow molding machine, the problem of cumbersome clamp replacement operation is solved, and the clamping blocks can be quickly replaced, improving replacement efficiency and ease of operation.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- HANGZHOU YINGTAI PACKAGING CO LTD
- Filing Date
- 2025-06-27
- Publication Date
- 2026-05-29
AI Technical Summary
The clamping device used in existing plastic bottle blow molding machines is cumbersome to operate when changing clamps of different lengths, which affects the efficiency of the changeover.
It adopts a ring slide, a displacement mechanism and a fixing mechanism. The displacement mechanism drives the ring slide to move closer or further away, and the distance between the fixing mechanisms is adjusted to achieve quick replacement of the clamping blocks. The rotating components and drive motors are used to achieve synchronous movement of the clamping blocks, simplifying the operation process.
It improves the replacement efficiency of the clamping device, simplifies the clamp replacement process, and enhances the convenience and efficiency of operation.
Smart Images
Figure CN224296553U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of clamping device technology, and in particular to a clamping device for a plastic bottle blow molding machine. Background Technology
[0002] Currently, clamping devices for plastic blow molding machines are typically used to secure molds or mold components to ensure mold stability during the blow molding process. These clamping devices need to provide sufficient clamping force and be quick and easy to adjust and replace when needed.
[0003] Chinese utility model patent CN222495360U discloses a clamping device for a plastic bottle blow molding machine, including a fixed plate. A mounting mechanism is fixedly mounted on the top of the fixed plate, a transmission mechanism is fixedly mounted on the right side of the fixed plate, and a clamping mechanism is movably mounted on the bottom of the fixed plate via the transmission mechanism. A movable groove is also included, with one side of the groove located at the bottom of the fixed plate. A fixed shaft is fixedly mounted on the left side of the inner wall of the movable groove, and a fixed rod is fixedly mounted on one side of the fixed shaft. A locking hole is provided at one end of the fixed rod, and the inner wall of the locking hole is movably mounted on one side of the fixed shaft. The clamping mechanism includes a movable rod and a movable locking rod. A screw block is movably mounted on the inner wall of the fixed plate, and the inner wall of the screw block is movably mounted on one side of the screw rod. A movable rod is movably mounted below the screw block via the locking shaft, and a movable locking groove is provided at the center of one side of the movable rod, with the inner wall of the movable locking groove movably mounted... The device features a movable locking rod. One side of the movable rod is movably mounted to the side of the fixed rod via the movable locking rod. One end of the movable rod is fixed to a mounting block by screws. A slot is provided on the right side of the mounting block, and locking grooves are provided at the top and bottom of the mounting block. A connecting block is movably mounted on the inner wall of the slot, and a clamping plate is fixedly mounted on the right side of the connecting block. After the device is installed, during operation, it may be necessary to adjust the length of the clamping plate according to the size of the inflated plastic. This can be done by pressing the locking blocks in the locking grooves above and below the mounting block inward to remove the clamping plate of the current length. Then, the connecting blocks at both ends of the new length clamping plate are inserted into the slots on the side of the mounting block. Under the action of the compression telescopic rod and compression spring inside the connecting block, the locking blocks on both sides of the connecting block are locked in the locking grooves, thus achieving the effect of changing the length of the clamping plate.
[0004] In the process of changing clamping plates of different lengths, the clamping device for the above-mentioned plastic bottle blow molding machine requires first using bolts to remove the fixing plate from the lifting mechanism, and then installing the fixing plate on the corresponding position of the lifting device with screws according to the new clamping plate length. The whole operation is cumbersome and not conducive to improving the efficiency of clamping plate replacement. Utility Model Content
[0005] To solve the above problems, this utility model provides a clamping device for a plastic bottle blow molding machine.
[0006] The above-mentioned technical objective of this utility model is achieved through the following technical solution: a clamping device for a plastic bottle blow molding machine, comprising a mounting frame and two sets of mounting blocks fixed to the top of the mounting frame. An annular sliding plate that slides through the side wall of the mounting frame and is slidably engaged with the mounting frame is provided. Two annular sliding plates are provided and symmetrically arranged about the middle of the mounting frame. The mounting frame is provided with a displacement mechanism for driving the two annular sliding plates to move closer or further apart. A first clamping block and a second clamping block are provided below the mounting frame. The annular sliding plates are provided with a fixing mechanism for fixing the first clamping block and the second clamping block. The number of fixing mechanisms is equal to the number of annular sliding plates, and their positions correspond one-to-one.
[0007] By adopting the above technical solution, during the replacement of the first clamping block and the second clamping block, the first clamping block and the second clamping block are first released from their fixed state by the fixing mechanism and removed from the annular slide plate. Then, according to the length of the new first clamping block and the second clamping block, the two sets of annular slide plates are driven to move closer or further apart by the displacement mechanism, thereby adjusting the distance between the fixing mechanisms on the two sets of annular slide plates. The new first clamping block and the second clamping block can then be installed on the annular slide plate, eliminating the cumbersome operation of the existing technology and improving the replacement efficiency of the device.
[0008] Furthermore, the displacement mechanism includes displacement components, the number of which is equal to the number of annular slide plates, and their positions correspond one-to-one. Each displacement component includes a mounting shell fixed to the mounting bracket, a rotating rod that passes through the mounting shell and is rotatably connected to it, a gear fixedly sleeved on the rotating rod and located inside the annular slide plate, and a rack fixed to the top of the annular slide plate and meshing with the gear. The displacement mechanism also includes a rotating component for driving the two sets of rotating rods to rotate synchronously in opposite directions.
[0009] By adopting the above technical solution, the rotating component drives the two sets of rotating rods to rotate synchronously in opposite directions, so that the gears connected to the rotating rods rotate synchronously in opposite directions. Since the gears mesh with the racks, the two sets of racks and the annular sliding plates connected to the two sets of racks move synchronously in opposite directions, so that the first clamping block and the second clamping block can be replaced normally.
[0010] Furthermore, the rotating assembly includes two worm gears respectively fixed on two sets of rotating rods and both located within the mounting housing, a first worm rotatably mounted within the mounting housing, a second worm rotatably mounted within the mounting housing and coaxially arranged with the first worm, and a rotating motor fixed to the mounting housing and driving the first worm to rotate. The end of the first worm near the second worm is fixed to the end of the second worm near the first worm. The first worm meshes with one of the worm gears, and the second worm meshes with the other worm gear. The direction of the worm groove on the first worm is opposite to the direction of the worm groove on the second worm.
[0011] By adopting the above technical solution, after the rotating motor works, it drives the first worm to rotate, which causes the second worm, which is coaxial with and fixed to the first worm, the worm wheel meshing with the first worm, and the worm wheel meshing with the second worm to all rotate. Since the rotation direction of the worm groove on the first worm is opposite to that on the second worm, the two sets of worm wheels can drive the two sets of rotating rods to rotate synchronously in opposite directions, thereby achieving the purpose of moving the two sets of annular sliding plates.
[0012] Furthermore, the fixing mechanism includes a fixing component, which includes an annular frame fixed to the annular slide plate, a first vertical block slidably disposed within the annular frame, a second vertical block slidably disposed within the annular frame, a first insert fixed to two sets of first vertical blocks, and a second insert fixed to two sets of second vertical blocks. The first clamping block has a first slot that engages with the first insert, and the first insert abuts against the first slot. The second clamping block has a second slot that engages with and abuts against the second insert. The number of first slots is equal to the number of first inserts and their positions correspond one-to-one. The number of second slots is equal to the number of second inserts and their positions correspond one-to-one. The fixing mechanism also includes a driving component for driving the first vertical block and the second vertical block closer to or further away from each other.
[0013] By adopting the above technical solution, during the replacement of the first clamping block and the second clamping block, the two sets of annular sliding plates are first driven to move away from each other, so that the annular frame connected to the two sets of annular sliding plates, the first vertical block connected to the two sets of annular frames, the second vertical block connected to the two sets of annular frames, the first insert block connected to the two sets of first vertical blocks, and the second insert block connected to the two sets of second vertical blocks all move away from each other until the two sets of first slots separate from the two sets of first insert blocks, and the two sets of second slots separate from the two sets of second insert blocks, thus completing the separation of the first clamping block and the second clamping block. Similarly, the first slot on the new first clamping block is inserted into one of the first inserts, and the second slot on the new second clamping block is inserted into the second insert. At this time, the two sets of annular sliding plates are driven to move closer to each other, so that the two sets of annular frames, the two sets of first vertical blocks, the two sets of second vertical blocks, the two sets of first inserts, and the two sets of second inserts all move closer to each other until the two sets of first slots are pressed against the two sets of first inserts and the two sets of second slots are pressed against the two sets of second inserts, thereby completing the purpose of installing the new first clamping block and the second clamping block and improving the replacement speed of the first clamping block and the second clamping block.
[0014] Furthermore, the drive assembly includes a bidirectional threaded rod rotatably mounted inside the ring frame and threadedly connected to the first vertical block and the second vertical block respectively, and a drive motor fixed on the ring frame and driving the bidirectional threaded rod to rotate. The bidirectional threaded rod is provided with two sets of threaded grooves with equal pitch and opposite directions of rotation. The two sets of threaded grooves are symmetrically arranged about the middle of the bidirectional threaded rod. The first vertical block and the second vertical block are threadedly connected to the two sets of threaded grooves respectively.
[0015] By adopting the above technical solution, after the drive motor is working, it drives the bidirectional threaded rod to rotate, causing the first and second vertical blocks to move closer together and clamp the product. Similarly, after the drive motor is working, it drives the bidirectional threaded rod to rotate in the opposite direction, causing the first and second vertical blocks to move away from each other and release the product, ensuring the normal clamping or releasing operation of the device.
[0016] Furthermore, a first clamping plate with a U-shaped structure is fixed on the first clamping block and snaps into the first insert block, and a second clamping plate with a U-shaped structure is fixed on the second clamping block and snaps into the second insert block. The number of the first clamping plates is equal to the number of the first insert blocks and their positions correspond one-to-one, and the number of the second clamping plates is equal to the number of the second insert blocks and their positions correspond one-to-one.
[0017] Furthermore, an annular sleeve plate is fixed on the side wall of the mounting frame for the annular sliding plate to pass through and slide in. The rotating rod passes through the annular sleeve plate and is rotatably connected. The number of annular sleeve plates is equal to the number of annular sliding plates and their positions correspond one-to-one.
[0018] By adopting the above technical solution, the design of the ring-shaped sleeve improves the stability of the ring skateboard during movement.
[0019] Furthermore, wavy grooves are provided on the sidewalls of the first and second clamping blocks that are close to each other.
[0020] By adopting the above technical solution, the friction force of the first clamping block and the second clamping block when clamping the product is improved.
[0021] In summary, the present invention has the following beneficial effects: by setting up a ring slide, a displacement mechanism and a fixing mechanism, the cumbersome operation of the prior art is eliminated and the replacement efficiency of the device is improved. Attached Figure Description
[0022] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present utility model;
[0023] Figure 2 This is a cross-sectional schematic diagram of an embodiment of the present invention to highlight the internal structure of the mounting housing;
[0024] Figure 3 This is a cross-sectional schematic diagram of an embodiment of the present invention to highlight the connection structure between the second slot and the second insert.
[0025] In the diagram: 1. Mounting frame; 2. Mounting block; 3. Annular sliding plate; 4. First clamping block; 5. Second clamping block; 6. Displacement mechanism; 61. Displacement assembly; 611. Mounting shell; 612. Rotating rod; 613. Gear; 614. Rack; 62. Rotating assembly; 621. Worm gear; 622. First worm; 623. Second worm; 624. Rotating motor; 7. Fixing mechanism; 71. Fixing assembly; 711. Annular frame; 712. First vertical block; 713. Second vertical block; 714. First insert block; 715. Second insert block; 72. Drive assembly; 721. Bidirectional threaded rod; 722. Drive motor; 8. First slot; 9. Second slot; 10. First clamping plate; 11. Second clamping plate; 12. Annular sleeve plate. Detailed Implementation
[0026] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.
[0027] like Figure 1-3 As shown in the figure, this application discloses a clamping device for a plastic bottle blow molding machine, including a mounting frame 1, a displacement mechanism 6, and a fixing mechanism 7. Two sets of mounting blocks 2 are fixed to the top of the mounting frame 1. Annular slide plates 3 are slidably disposed on the side wall of the mounting frame 1, and two annular slide plates 3 are symmetrically arranged about the middle of the mounting frame 1. A first clamping block 4 and a second clamping block 5 are disposed below the mounting frame 1. The number of fixing mechanisms 7 is equal to the number of annular slide plates 3, and their positions correspond one-to-one. During the replacement of the first clamping block 4 and the second clamping block 5, the fixing mechanism 7 is first used to release the first clamping block 4 and the second clamping block 5 from their fixed state, and the first clamping block 4 and the second clamping block 5 are removed from the annular slide plates 3. Then, according to the length of the new first clamping block 4 and the second clamping block 5, the displacement mechanism 6 drives the two sets of annular slide plates 3 to move closer or further apart, thereby adjusting the distance between the fixing mechanisms 7 on the two sets of annular slide plates 3. The new first clamping block 4 and the second clamping block 5 can then be installed on the annular slide plates 3, eliminating the cumbersome operation of the prior art and improving the replacement efficiency of the device.
[0028] A displacement mechanism 6 is mounted on the mounting frame 1. The displacement mechanism 6 is used to drive the two annular sliding plates 3 to move closer or further apart. The displacement mechanism 6 includes a displacement component 61 and a rotation component 62. The displacement component 61 includes a mounting shell 611, a rotating rod 612, a gear 613, and a rack 614. The number of displacement components 61 is equal to the number of annular sliding plates 3, and their positions correspond one-to-one. The mounting shell 611 is fixed to the mounting frame 1. The rotating rod 612 passes through the mounting shell 611 and is rotatably connected. The gear 613 is fixedly sleeved on the rotating rod 612 and located inside the annular sliding plate 3. The rack 614 is fixed to the top of the annular sliding plate 3 and meshes with the gear 613. The rotating assembly 62 drives the two sets of rotating rods 612 to rotate synchronously in opposite directions, causing the gears 613 connected to the rotating rods 612 to rotate synchronously in opposite directions. Since the gears 613 mesh with the racks 614, the two sets of racks 614 and the annular slide plates 3 connected to the two sets of racks 614 respectively move synchronously in opposite directions, so that the first clamping block 4 and the second clamping block 5 can be replaced normally.
[0029] The rotating assembly 62 drives two sets of rotating rods 612 to rotate synchronously in opposite directions. The rotating assembly 62 includes a worm gear 621, a first worm 622, a second worm 623, and a rotating motor 624. The worm gears 621 are fixed to the rotating rods 612 and are all located within the mounting housing 611. The number of worm gears 621 is equal to the number of rotating rods 612, and their positions correspond one-to-one. The first worm 622 is rotatably mounted within the mounting housing 611. The end of the first worm 622 near the second worm 623 is fixed to the end of the second worm 623 near the first worm 622. The worm groove on the first worm 622 has the opposite rotation direction to the worm groove on the second worm 623. The first worm 622 meshes with one of the worm gears 621. The second worm 623 is rotatably mounted inside the mounting housing 611 and coaxially arranged with the first worm 622. The second worm 623 meshes with another worm wheel 621. The rotating motor 624 is fixed on the mounting housing 611 and drives the first worm 622 to rotate. After the rotating motor 624 works, it drives the first worm 622 to rotate, so that the second worm 623, which is coaxially fixed with the first worm 622, the worm wheel 621 meshing with the first worm 622, and the worm wheel 621 meshing with the second worm 623 all rotate. Since the rotation direction of the worm groove on the first worm 622 is opposite to that on the second worm 623, the two sets of worm wheels 621 can drive the two sets of rotating rods 612 to rotate synchronously in opposite directions, thereby realizing the purpose of moving the two sets of annular slide plates 3.
[0030] A fixing mechanism 7 is mounted on the annular slide plate 3 and is used to fix the first clamping block 4 and the second clamping block 5. The fixing mechanism 7 includes a fixing component 71 and a driving component 72. The fixing component 71 includes an annular frame 711, a first vertical block 712, a second vertical block 713, a first insert block 714, and a second insert block 715. The annular frame 711 is fixed to the annular slide plate 3, and the first vertical block 712 is slidably disposed within the annular frame 711. The second vertical block 713 is slidably disposed within the annular frame 711, and the first insert block 714 is fixed to the first vertical block 712. The number of first insert blocks 714 is equal to the number of first vertical blocks 712, and their positions correspond one-to-one. The first clamping block 4 has a first slot 8 that engages with the first insert block 714. The first insert block 714 abuts against the first slot 8, and the number of first slots 8 is equal to the number of first insert blocks 714, and their positions correspond one-to-one. The second insert 715 is fixed to the second vertical block 713. The number of second inserts 715 is equal to the number of second vertical blocks 713, and their positions correspond one-to-one. The second clamping block 5 has a second slot 9 that is inserted and mated with the second insert 715. The number of second slots 9 is equal to the number of second inserts 715, and their positions correspond one-to-one. During the replacement of the first clamping block 4 and the second clamping block 5, the two sets of annular sliding plates 3 are first driven to move away from each other, so that the annular frame 711 connected to the two sets of annular sliding plates 3, the first vertical block 712 connected to the two sets of annular frame 711, the second vertical block 713 connected to the two sets of annular frame 711, the first insert block 714 connected to the two sets of first vertical blocks 712, and the second insert block 715 connected to the two sets of second vertical blocks 713 all move away from each other until the two sets of first slots 8 separate from the two sets of first insert blocks 714, and the two sets of second slots 9 separate from the two sets of second insert blocks 715, thus completing the separation of the first clamping block 4 and the second clamping block 5. Similarly, the first slot 8 on the new first clamping block 4 is inserted into one of the first inserts 714, and the second slot 9 on the new second clamping block 5 is inserted into the second insert 715. At this time, the two sets of annular sliding plates 3 are driven to move closer to each other, so that the two sets of annular frames 711, the two sets of first vertical blocks 712, the two sets of second vertical blocks 713, the two sets of first inserts 714, and the two sets of second inserts 715 all move closer to each other until the two sets of first slots 8 and the two sets of first inserts 714 are pressed together, and the two sets of second slots 9 and the two sets of second inserts 715 are pressed together, thereby completing the purpose of installing the new first clamping block 4 and the second clamping block 5 and improving the replacement speed of the first clamping block 4 and the second clamping block 5.
[0031] The drive assembly 72 is used to drive the first vertical block 712 and the second vertical block 713 to move closer or further apart. The drive assembly 72 includes a bidirectional threaded rod 721 and a drive motor 722. The bidirectional threaded rod 721 is rotatably mounted inside the ring frame 711 and threadedly connected to the first vertical block 712 and the second vertical block 713 respectively. The bidirectional threaded rod 721 is provided with two sets of threaded grooves with equal pitch and opposite directions of rotation. The two sets of threaded grooves are symmetrically arranged about the middle of the bidirectional threaded rod 721. The first vertical block 712 and the second vertical block 713 are threadedly connected to the two sets of threaded grooves respectively. The drive motor 722 is fixed on the ring frame 711 and drives the bidirectional threaded rod 721 to rotate. After the drive motor 722 operates, it drives the bidirectional threaded rod 721 to rotate, causing the first vertical block 712 and the second vertical block 713 to move closer together and clamp the product. Similarly, after the drive motor 722 works, it drives the bidirectional threaded rod 721 to rotate in the opposite direction, so that the first vertical block 712 and the second vertical block 713 move away from each other and loosen the product, ensuring the normal clamping or loosening operation of the device.
[0032] The first clamping block 4 is fixed with a first clamping plate 10 of U-shape that is snapped into and connected to the first insert block 714. The number of first clamping plates 10 is equal to the number of first insert blocks 714, and their positions correspond one-to-one. The second clamping block 5 is fixed with a second clamping plate 11 of U-shape that is snapped into and connected to the second insert block 715. The number of second clamping plates 11 is equal to the number of second insert blocks 715, and their positions correspond one-to-one.
[0033] An annular sleeve plate 12 is fixed on the side wall of the mounting frame 1, through which the annular slide plate 3 passes and slides. A rotating rod 612 passes through the annular sleeve plate 12 and is rotatably connected. The number of annular sleeve plates 12 is equal to the number of annular slide plates 3, and their positions correspond one-to-one. The setting of the annular sleeve plate 12 improves the stability of the annular slide plate 3 during movement.
[0034] Both the first clamping block 4 and the second clamping block 5 have wavy grooves on their adjacent sidewalls. This increases the friction between the first clamping block 4 and the second clamping block 5 when clamping the product.
[0035] The above description is merely a preferred embodiment of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are protected. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should also be considered within the protection scope of this utility model.
Claims
1. A clamping device for a plastic bottle blow molding machine, comprising a mounting frame (1) and two sets of mounting blocks (2) fixed to the top of the mounting frame (1), characterized in that: The mounting frame (1) has a ring-shaped sliding plate (3) that slides through it. The ring-shaped sliding plate (3) has two pieces and is symmetrically arranged about the middle of the mounting frame (1). The mounting frame (1) is provided with a displacement mechanism (6) for driving the two ring-shaped sliding plates (3) to move closer or further apart. The mounting frame (1) has a first clamping block (4) and a second clamping block (5) below it. The ring-shaped sliding plate (3) is provided with a fixing mechanism (7) for fixing the first clamping block (4) and the second clamping block (5). The number of fixing mechanisms (7) is equal to the number of ring-shaped sliding plates (3), and their positions correspond one-to-one.
2. The clamping device for a plastic bottle blow molding machine according to claim 1, characterized in that: The displacement mechanism (6) includes a displacement assembly (61), the number of displacement assemblies (61) is equal to the number of annular slide plates (3), and their positions correspond one-to-one. The displacement assembly (61) includes a mounting shell (611) fixed on the mounting bracket (1), a rotating rod (612) that passes through the mounting shell (611) and is rotatably connected, a gear (613) fixedly sleeved on the rotating rod (612) and located inside the annular slide plate (3), and a rack (614) fixed to the top of the annular slide plate (3) and meshing with the gear (613). The displacement mechanism (6) also includes a rotating assembly (62) for driving the two sets of rotating rods (612) to rotate synchronously in opposite directions.
3. The clamping device for a plastic bottle blow molding machine according to claim 2, characterized in that: The rotating assembly (62) includes two worm gears (621) fixed to two sets of rotating rods (612) and both located in the mounting housing (611), a first worm (622) rotatably mounted in the mounting housing (611), a second worm (623) rotatably mounted in the mounting housing (611) and coaxially arranged with the first worm (622), and a rotating motor (624) fixed to the mounting housing (611) and driving the first worm (622) to rotate. The end of the first worm (622) near the second worm (623) is fixed to the end of the second worm (623) near the first worm (622). The first worm (622) meshes with one of the worm gears (621), and the second worm (623) meshes with the other worm gear (621). The direction of the worm groove on the first worm (622) is opposite to the direction of the worm groove on the second worm (623).
4. The clamping device for a plastic bottle blow molding machine according to claim 1, characterized in that: The fixing mechanism (7) includes a fixing component (71), which includes an annular frame (711) fixed to the annular slide plate (3), a first vertical block (712) slidably disposed within the annular frame (711), a second vertical block (713) slidably disposed within the annular frame (711), a first insert (714) fixed to the two sets of first vertical blocks (712), and a second insert (715) fixed to the two sets of second vertical blocks (713). The first clamping block (4) has a first clamping part that engages with the first insert (714). The first insert (714) abuts against the first slot (8), and the second clamp (5) is provided with a second slot (9) that is inserted and abuts against the second insert (715). The number of the first slots (8) is equal to the number of the first inserts (714) and their positions correspond one-to-one. The number of the second slots (9) is equal to the number of the second inserts (715) and their positions correspond one-to-one. The fixing mechanism (7) also includes a driving component (72) for driving the first vertical block (712) and the second vertical block (713) to move closer or further away from each other.
5. A clamping device for a plastic bottle blow molding machine according to claim 4, characterized in that: The drive assembly (72) includes a bidirectional threaded rod (721) rotatably mounted in the ring frame (711) and threadedly connected to the first vertical block (712) and the second vertical block (713) respectively, and a drive motor (722) fixed on the ring frame (711) and driving the bidirectional threaded rod (721) to rotate. The bidirectional threaded rod (721) is provided with two threaded grooves with equal pitch and opposite direction of rotation. The two sets of threaded grooves are symmetrically arranged about the middle of the bidirectional threaded rod (721). The first vertical block (712) and the second vertical block (713) are threadedly connected to the two sets of threaded grooves respectively.
6. A clamping device for a plastic bottle blow molding machine according to claim 4, characterized in that: The first clamping block (4) is fixed with a first clamping plate (10) that is snapped into the first insert (714) and has a U-shaped structure. The second clamping block (5) is fixed with a second clamping plate (11) that is snapped into the second insert (715) and has a U-shaped structure. The number of the first clamping plates (10) is equal to the number of the first insert (714) and their positions correspond one-to-one. The number of the second clamping plates (11) is equal to the number of the second insert (715) and their positions correspond one-to-one.
7. A clamping device for a plastic bottle blow molding machine according to claim 2, characterized in that: The mounting bracket (1) has an annular sleeve plate (12) fixed on its side wall for the annular slide plate (3) to pass through and slide together. The rotating rod (612) passes through the annular sleeve plate (12) and is rotatably connected. The number of annular sleeve plates (12) is equal to the number of annular slide plates (3) and their positions correspond one-to-one.
8. A clamping device for a plastic bottle blow molding machine according to claim 1, characterized in that: The first clamping block (4) and the second clamping block (5) are provided with wavy grooves on their side walls that are close to each other.