Handle clamping groove forming device easy to maintain and bottle blowing mold

Abstract

The utility model relates to a handle clamping groove forming device easy to maintain and a bottle blowing mold. The handle clamping groove forming device comprises a mold insert, the mold insert is connected with two lugs in a sliding mode, and the two lugs protrude out of the two ends of the mold insert respectively and are provided with forming end parts; the convex lug comprises a convex lug sliding block, a first guide claw and a convex lug structure, the first guide claw and the convex lug structure are connected to the convex lug sliding block, and the convex lug sliding block is in sliding fit with the mold insert; the mold insert is provided with a limiting guide block and two limiting block groups, the limiting surfaces of the limiting block groups and the limiting guide block are connected with wear-resistant gaskets, the lug sliding block is in corresponding contact with the wear-resistant gaskets of the limiting block groups, and the first guide claw is in corresponding contact with the wear-resistant gaskets of the limiting guide block; the mold insert is connected with a wear-resisting plate, and the lug sliding block is connected to the wear-resisting plate in a sliding mode. Abrasion occurs on the wear-resisting plate and the wear-resisting gasket, so that wear and breakage of the mold insert can be reduced, and the service life of the mold insert is prolonged.

Description

Technical Field

[0001] This utility model relates to the field of blow molding technology, specifically to an easy-to-maintain handle slot forming device and blow molding mold. Background Technology

[0002] In the blow molding process of containers with slots, the blow molding die needs to form the upper and lower slots using two lugs. During container blowing, the upper and lower lugs extend into the mold cavity to form the slots; after blowing is completed, the two lugs retract into the mold cavity to facilitate removal of the container from the blow molding die.

[0003] The prior art discloses a blow molding die with a pneumatic handle mechanism, including a mold body, a cavity insert for mating and connecting with the cavity of the mold body, an upper slider and a lower slider disposed at the upper and lower ends of the cavity insert and slidably connected within the cavity insert, the upper end of the upper slider and the lower end of the lower slider respectively having protrusions; it also includes a movable plate disposed at the rear side of the cavity insert and slidably connected to the cavity insert left and right, and a cylinder fixed at the rear side of the movable plate; the upper slider and the lower slider are respectively provided with upper guide rods and lower guide rods at their rear sides, the movable plate has upper sliding grooves and lower sliding grooves that are slidably connected to the upper guide rods and lower guide rods respectively and drive the upper guide rods and lower guide rods to move vertically, and a drive rod is provided at the rear side of the movable plate; the drive rod is fixedly connected to the piston rod of the cylinder and is driven by the piston rod to move horizontally.

[0004] It has the following technical problems:

[0005] The long-term linear high-speed sliding of the upper and lower sliders on the cavity insert is difficult to maintain, which can easily cause wear and breakage of the cavity insert and shorten its service life.

[0006] Therefore, targeted improvements are needed. Utility Model Content

[0007] In view of the problems existing in the prior art, the purpose of this utility model is to provide an easy-to-maintain handle slot forming device and blow molding die, which can reduce the wear and breakage of mold inserts, extend the service life of mold inserts, and reduce production and maintenance costs.

[0008] To achieve the above objectives, the present invention adopts the following technical solution:

[0009] An easy-to-maintain handle slot forming device, including a mold insert;

[0010] The mold insert has two lugs that slide together. The two lugs protrude from both ends of the mold insert and have shaped ends that are opposite to each other in the axial direction.

[0011] The lug includes a lug slider, a first guide claw, and a lug structure. The first guide claw and the lug structure are respectively connected to the outer and inner sides of the lug slider. The first guide claw protrudes from the opposite side of the lug slider of the two lugs. The outer side of the lug slider slides in cooperation with the inner side of the mold insert. The lug structure defines the molding end.

[0012] The mold insert is provided with a limiting guide block and two sets of limiting block groups along the axial direction. The limiting guide block is located in the middle of the two sets of limiting block groups. Two lugs are located between the two sets of limiting block groups and on both sides of the limiting guide block. The lugs slide between the limiting guide block and the limiting block groups.

[0013] The limiting surfaces of both the limiting block assembly and the limiting guide block are detachably connected to wear-resistant pads. The lug slider contacts the wear-resistant pads of the limiting block assembly, and the first guide claw contacts the wear-resistant pads of the limiting guide block.

[0014] The inner side of the mold insert is detachably connected to a wear-resistant plate, and the bottom surface of the lug slider is slidably connected to the wear-resistant plate.

[0015] Furthermore, the mold insert is provided with a guide channel extending along the axial direction, and the first guide claw is adapted to slide in the guide channel.

[0016] Furthermore, each set of limit blocks includes two limit blocks, the inner surfaces of which define the guide channel.

[0017] Furthermore, two second guide claws are symmetrically provided on the opposite side of the two lug sliders. The width between the two sides of the limiting guide block is adapted to the distance between the two second guide claws, and the limiting guide block and the two second guide claws are slidably connected.

[0018] Furthermore, the mold insert is provided with an air passage, and two lugs are respectively connected to the air passage. The air passage is configured to drive the two lugs to move away from each other or towards each other.

[0019] Furthermore, the mold insert is provided with a sliding channel extending along the axial direction and two connecting rods slidably connected to the sliding channel. Two lugs are fixedly installed on the two connecting rods respectively. The connecting rods and the mold insert together define a sealed space between the relatively distal end of the connecting rod and the mold insert, and between the relatively proximal end of the connecting rod. The air passage is connected to the sealed space and is used to drive the two connecting rods to move in opposite directions or towards each other.

[0020] Furthermore, the air path includes a first air path and a second air path. The outlet of the first air path is connected to the middle of the sliding channel, and the outlet of the second air path is connected to both ends of the sliding channel.

[0021] Furthermore, the mold insert is provided with a protrusion, on which a first air inlet connector and a second air inlet connector are respectively connected. The air inlet end of the first air passage is connected to the first air inlet connector, and the air inlet end of the second air passage is connected to the second air inlet connector.

[0022] Furthermore, the connecting rod has a radially penetrating connecting hole, and the outer periphery of the connecting rod has a first recess and a second recess at the penetrating position of the connecting hole. The first guide claw is provided with a snap-fit ​​part and a connecting cylinder. A lug limiting guide hole is provided between the guide channel and the limiting guide block. The widths of the first recess and the lug limiting guide hole are both adapted to the snap-fit ​​part. The snap-fit ​​part passes through the lug limiting guide hole and snaps into the first recess. Corresponding to the two connecting rods, the mold insert is provided with two strip-shaped connecting rod limiting guide holes in sequence along the axial direction. A connecting block is provided in the second recess. The connecting cylinder passes through the connecting hole and is fixed to the connecting block. The connecting block is slidably connected to the connecting rod limiting guide hole.

[0023] A blow molding die includes a mold cavity and an easy-to-maintain handle slot forming device;

[0024] The handle slot forming mechanism is installed in the mold cavity, which has a cavity. When the two lugs of the handle slot forming mechanism move in opposite directions or towards each other, the forming ends of the lugs protrude into the cavity or retract into the mold cavity accordingly.

[0025] In summary, this utility model has the following advantages:

[0026] When the lug slides on the mold insert, the bottom surface of the lug slider slides on the wear-resistant plate, and the lug slider contacts the wear-resistant pad on the limit block assembly. The back of the first guide claw contacts the wear-resistant pad on the limit guide block. Wear occurs on the wear-resistant plate and the wear-resistant pad. After wear, the wear-resistant plate and the wear-resistant pad can be replaced. The mold insert will not directly contact the lug, thereby reducing the wear and breakage of the mold insert, extending the service life of the mold insert, and reducing production and maintenance costs. Attached Figure Description

[0027] Figure 1 This is a three-dimensional structural diagram of the handle slot forming mechanism in this embodiment.

[0028] Figure 2 This is a three-dimensional structural diagram of the mold insert in this embodiment.

[0029] Figure 3 This is a top view of the handle slot forming mechanism in this embodiment.

[0030] Figure 4 for Figure 3 AA view in the middle.

[0031] Figure 5 This is a bottom view of the handle slot forming mechanism in this embodiment.

[0032] Figure 6 for Figure 5 The EE view in the middle.

[0033] Figure 7 for Figure 5 The FF view in the game.

[0034] Figure 8 This is a schematic diagram of the installation of the connecting rod and lug in this embodiment.

[0035] Figure 9 This is a three-dimensional structural diagram of the lug in this embodiment.

[0036] Figure 10 This is a three-dimensional structural diagram of the connecting rod in this embodiment.

[0037] Figure 11 This is a schematic diagram of the structure of the split connecting rod and the integrated connecting rod in this embodiment.

[0038] Figure 12 This is a schematic diagram of the internal structure of the blow molding die in this embodiment.

[0039] In the picture:

[0040] 1-Mold insert, 11-Sliding channel, 12-First air passage, 13-Second air passage, 14-Limiting block, 141-Guide channel, 15-Limiting guide block, 16-Wear-resistant pad, 17-Wear-resistant plate, 18-Lumber limiting guide hole, 19-Connecting rod limiting guide hole;

[0041] 2-Lunge, 21-Lunge slider, 22-Lunge structure, 23-First guide claw, 231-Snap-fit ​​part, 232-Connecting cylinder, 24-Second guide claw;

[0042] 3-Connecting rod, 31-Sliding channel, 32-First recess, 33-Second recess, 331-Connecting block, 34-Connecting rod body, 35-Connecting rod cover, 36-Sealing ring;

[0043] 4-Cover plate;

[0044] 5-Protrusion, 51-First air intake connector, 52-Second air intake connector;

[0045] 6-Connectors;

[0046] 7-Mold cavity, 71-Cavity. Detailed Implementation

[0047] The present invention will now be described in further detail.

[0048] like Figure 1 As shown, an easy-to-maintain handle slot forming device includes a mold insert 1 and two lugs 2 slidably connected to the mold insert 1. The two lugs 2 protrude from both ends of the mold insert 1 and have forming ends that are opposite to each other in the axial direction.

[0049] like Figure 9 As shown, the lug 2 includes a lug slider 21, a first guide claw 23, and a lug structure 22. The first guide claw 23 and the lug structure 22 are respectively connected to the outer and inner sides of the lug slider 21. The first guide claw 23 protrudes from the opposite side of the lug slider 21 of the two lugs 2. The outer side of the lug slider 21 slides in engagement with the inner side of the mold insert 1. The lug structure 22 defines the molding end. The first guide claw 23 has an outwardly extending snap-fit ​​portion 231 and a connecting cylinder 232. Two second guide claws 24 are symmetrically provided on the opposite side of the two lug sliders 21.

[0050] like Figures 1-4 As shown, the mold insert 1 is provided with a limiting guide block 15 and two sets of limiting block groups along the axial direction. The limiting guide block 15 is located in the middle of the two sets of limiting block groups. Two lugs 2 are located between the two sets of limiting block groups and are located on both sides of the limiting guide block 15 respectively. The lugs 2 slide between the limiting guide block 15 and the limiting block groups.

[0051] Wear-resistant pads 16 are detachably connected to the inner side of the limiting block assembly and the outer side of the limiting guide block 15. The outer side of the lug slider 21 is in contact with the wear-resistant pads 16 of the limiting block assembly, and the back of the first guide claw 23 is in contact with the wear-resistant pads 16 of the limiting guide block 15.

[0052] The inner side of the mold insert 1 is detachably connected to the wear-resistant plate 17, and the bottom surface of the lug slider 21 is slidably connected to the wear-resistant plate 17.

[0053] When the lug 2 slides on the mold insert 1, the bottom surface of the lug slider 21 slides on the wear-resistant plate 17. The outer side of the lug slider 21 contacts the wear-resistant pad 16 on the limiting block assembly. The back of the first guide claw 23 contacts the wear-resistant pad 16 on the limiting guide block 15. Wear occurs on the wear-resistant plate 17 and the wear-resistant pad 16. After wear, the wear-resistant plate 17 and the wear-resistant pad 16 can be replaced. Since the mold insert 1 does not directly contact the lug 2, the wear and breakage of the mold insert 1 can be reduced, the service life of the mold insert 1 can be extended, and the production and maintenance costs can be reduced.

[0054] The mold insert 1 is equipped with an air passage, and two lugs 2 are respectively connected to the air passage. The air passage is used to introduce high-pressure gas to drive the two lugs 2 to move back to back or towards each other. Compared with the prior art that uses rigid mechanical drive to move the two lugs 2, this embodiment adopts pneumatic drive, which has the advantages of simple structure, small weight, high energy efficiency, environmental friendliness, low production and maintenance costs, fast action and response, and flexible control. It is conducive to realizing the lightweighting of blow molding molds, reducing production and maintenance costs, and achieving energy conservation and emission reduction.

[0055] like Figure 2 , Figure 8As shown, the mold insert 1 has an axially arranged sliding channel 11 and two connecting rods 3 slidably connected to the sliding channel 11. Two lugs 2 are respectively fixedly installed on the two connecting rods 3. The connecting rods 3 can drive the lugs 2 to slide axially on the inner side of the mold insert 1. The connecting rods 3 and the mold insert 1 together define the sealed space between the relatively distal end of the connecting rod 3 and the mold insert 1, and the sealed space between the relatively proximal ends of the two connecting rods 3 (that is, the relatively distal end of the connecting rod 3 and the mold insert 1, and the relatively proximal end of the connecting rod 3 are both enclosed to form sealed spaces). The air passage is connected to the sealed space.

[0056] like Figure 6 , Figure 7 As shown, the air passage of the mold insert 1 includes a first air passage 12 and a second air passage 13. The air outlet of the first air passage 12 is connected to the middle of the sliding channel 11, and the air outlet of the second air passage 13 is connected to both ends of the sliding channel 11. When the first air passage 12 is under positive pressure, it pushes the two connecting rods 3 from the inside out, causing the two connecting rods 3 to slide synchronously and in a direction away from each other in the sliding channel 11, thereby causing the two lugs 2 to slide synchronously and in opposite directions on the inner surface of the mold insert 1. When the second air passage 13 is under positive pressure, it pushes the two connecting rods 3 from the outside in, causing the two connecting rods 3 to slide synchronously and in a direction close to each other in the sliding channel 11, thereby causing the two lugs 2 to slide synchronously and in opposite directions on the inner surface of the mold insert 1.

[0057] like Figure 1 , Figure 4 , Figure 6 , Figure 7 As shown, the outer surface of the mold insert 1 has an outwardly protruding protrusion 5. A first air inlet connector 51 and a second air inlet connector 52 are respectively connected to the protrusion 5. The air inlet end of the first air passage 12 is connected to the first air inlet connector 51, and the air inlet end of the second air passage 13 is connected to the second air inlet connector 52. The first air passage 12 and the second air passage 13 are respectively connected to a gas pressure source through the first air inlet connector 51 and the second air inlet connector 52, so that the first air passage 12 and the second air passage 13 respectively obtain positive pressure. In practice, when the first air passage 12 or the second air passage 13 obtains positive pressure, the second air passage 13 and the first air passage 12 are respectively under negative pressure, so as to better drive the two connecting rods 3 to move.

[0058] The inner side of the mold insert 1 has a lug limiting and guiding structure, which is used to limit and guide the extension and retraction movement of the lug 2 to improve the smoothness of mold operation.

[0059] like Figure 2As shown, the lug limiting guide structure includes two sets of limiting block groups arranged opposite each other along the axial direction. Each set of limiting block groups includes two limiting blocks 14. The mold insert 1 is provided with a guide channel 141 extending along the axial direction. The inner surfaces of the two limiting blocks 14 define the guide channel 141. The first guide claw 23 is adapted to slide in the guide channel 141.

[0060] The lug-limiting guide structure also includes a limiting guide block 15 that extends axially between the two sets of limiting blocks, and the width between the two sides of the limiting guide block 15 is adapted to the spacing between the two second guide claws 24.

[0061] The lug limiting guide structure also includes two lug limiting guide holes 18 arranged sequentially along the axial direction. The lug limiting guide holes 18 extend axially between the guide channel 141 and the limiting guide block 15. The lug limiting guide holes 18 penetrate to the connecting hole 31 on the connecting rod 3. The width of the lug limiting guide holes 18 is adapted to the snap-fit ​​part 231.

[0062] In specific implementation, the limiting block group is used to limit the two lug sliders 21, which can limit the outer side of the lug 2; the limiting guide block 15 is used to limit the two lug sliders 21, which can limit the inward movement stroke of the lug 2; the lug limiting guide hole 18 is used to limit the snap-fit ​​part 231, which can limit the outward movement stroke of the lug 2. The sliding stroke of the lug 2 is limited from multiple angles, ensuring the safety of the movement of the lug 2.

[0063] By utilizing the sliding engagement between the first guide claw 23 and the guide channel 141, the sliding engagement between the two second guide claws 24 and the two sides of the limiting guide block 15, and the sliding engagement between the snap-fit ​​part 231 and the lug limiting guide hole 18, the lug 2 is guided to slide from multiple positions, thereby ensuring that the lug 2 slides along the axial direction and improving the motion accuracy.

[0064] Through the above multi-angle and multi-position limiting and guiding, the smooth movement of the lug 2 is ensured.

[0065] like Figure 10 As shown, the middle part of the connecting rod 3 has a radially penetrating connecting hole 31. The outer periphery of the connecting rod 3 has a first recess 32 and a second recess 33 on both sides of the penetrating position of the connecting hole 31. The first recess 32 is adapted to the snap-fit ​​part 231, the connecting hole 31 is adapted to the connecting cylinder 232, and a connecting block 331 is provided in the second recess 33. The connecting block 331 is slidably connected to the mold insert 1.

[0066] In practice, the snap-fit ​​part 231 passes through the lug limiting guide hole 18 and snaps into the first recess 32. The connecting cylinder 232 is adapted to be installed in the connecting hole 31 and fixed to the connecting block 331. The connecting piece 6 is used to lock the cooperation between the connecting block 331 and the connecting cylinder 232, so as to achieve a tight connection between the lug 2 and the connecting rod 3.

[0067] Specifically, the outer surface of mold insert 1 has a connecting rod limiting and guiding structure:

[0068] The connecting rod limiting guide structure includes two strip-shaped connecting rod limiting guide holes 19 arranged sequentially on the mold insert 1. The connecting rod limiting guide holes 19 extend axially. The connecting rod limiting guide holes 19 penetrate to the connecting hole 31. The width of the connecting rod limiting guide holes 19 is adapted to the connecting block 331. The connecting block 331 slides on the connecting rod limiting guide holes 19.

[0069] In specific implementation, the connecting block 331 is limited by the connecting rod limiting guide hole 19, which limits the sliding stroke of the connecting rod 3, thereby limiting the sliding stroke of the lug 2; the sliding cooperation between the connecting block 331 and the connecting rod limiting guide hole 19 guides the sliding of the connecting rod 3, thereby ensuring that the connecting rod 3 and the lug 2 slide along the axial direction and improving the motion accuracy.

[0070] Preferably, connector 6 is a flange bolt with washer and toothed edge to prevent loosening and improve safety performance.

[0071] like Figure 1 , Figure 2 As shown, the mold insert 1 has a channel hole that runs through the mold insert 1 along the axial direction. Then, the two ends of the channel hole are closed with a cover plate 4 to form the sliding channel 11 mentioned above.

[0072] It should be noted that the middle part of the sliding channel 11 refers to the area between the two connecting rods 3, and the end of the sliding channel 11 refers to the area between the connecting rod 3 and the cover plate 4.

[0073] like Figure 11 As shown, the connecting rod 3 can be a split structure connecting rod, including a connecting rod body 34 and two connecting rod covers 35. The two connecting rod covers 35 are respectively installed at both ends of the connecting rod body 34, forming two sealing ring grooves after installation. A sealing ring 36 is installed in each of the two sealing ring grooves.

[0074] Alternatively, the connecting rod 3 can be a one-piece structure, with sealing ring grooves at both ends of the connecting rod 3, and sealing rings 36 are installed in the sealing ring grooves at both ends of the connecting rod 3.

[0075] Preferably, the sealing ring 36 is a Glyd ring, whose steel ring can protect the rubber ring and prevent wear on the rubber ring.

[0076] like Figure 12As shown, a blow molding die includes a mold cavity 7 and a handle slot forming mechanism. The handle slot forming mechanism is installed in the mold cavity 7, which has a cavity 71. Two lugs 2 of the handle slot forming mechanism are driven by an air passage to move in opposite directions or towards each other, so that the forming ends of the lugs 2 protrude into the cavity 71 or retract into the mold cavity 7 accordingly. Since the blow molding die uses an air passage connected to a gas pressure source to drive the movement of the two lugs 2, compared with the rigid mechanical drive of the prior art, it has advantages such as simple structure, lighter weight, lower energy consumption, lower noise, lower production and maintenance costs, and easier adjustment. This facilitates the lightweighting of blow molding dies, reduces production and maintenance costs, and conforms to the concept of energy conservation and emission reduction. Wear-resistant and easily replaceable parts are designed for easy wear, and strength-enhancing adjustments are made for easily broken parts to reduce frequent damage and replacement of related parts, thereby reducing maintenance costs, reducing downtime for replacement, ensuring blow molding stability, and improving production efficiency.

[0077] The above embodiments are preferred embodiments of the present utility model, but the embodiments of the present utility model are not limited to the above embodiments. Any changes, modifications, substitutions, combinations, or simplifications made without departing from the spirit and principle of the present utility model shall be considered equivalent substitutions and shall be included within the protection scope of the present utility model.

Claims

1. A handle slot forming device that is easy to maintain, characterized in that: Including mold inserts; The mold insert has two lugs that slide together. The two lugs protrude from both ends of the mold insert and have shaped ends that are opposite to each other in the axial direction. The lug includes a lug slider, a first guide claw, and a lug structure. The first guide claw and the lug structure are respectively connected to the outer and inner sides of the lug slider. The first guide claw protrudes from the opposite side of the lug slider of the two lugs. The outer side of the lug slider slides in cooperation with the inner side of the mold insert. The lug structure defines the molding end. The mold insert is provided with a limiting guide block and two sets of limiting block groups along the axial direction. The limiting guide block is located in the middle of the two sets of limiting block groups. Two lugs are located between the two sets of limiting block groups and on both sides of the limiting guide block. The lugs slide between the limiting guide block and the limiting block groups. The limiting surfaces of both the limiting block assembly and the limiting guide block are detachably connected to wear-resistant pads. The lug slider contacts the wear-resistant pads of the limiting block assembly, and the first guide claw contacts the wear-resistant pads of the limiting guide block. The inner side of the mold insert is detachably connected to a wear-resistant plate, and the bottom surface of the lug slider is slidably connected to the wear-resistant plate.

2. The easy-to-maintain handle slot forming device according to claim 1, characterized in that: The mold insert has a guide channel extending along the axial direction, and the first guide claw is adapted to slide in the guide channel.

3. The easy-to-maintain handle slot forming device according to claim 2, characterized in that: Each set of limit blocks includes two limit blocks, and the inner surfaces of the two limit blocks define the guide channel.

4. The easy-to-maintain handle slot forming device according to claim 1, characterized in that: Two second guide claws are symmetrically provided on one side of the two lug sliders facing each other. The width between the two sides of the limiting guide block is adapted to the distance between the two second guide claws. The limiting guide block and the two second guide claws are slidably connected.

5. The easy-to-maintain handle slot forming device according to claim 1, characterized in that: The mold insert is equipped with an air passage, and two lugs are connected to the air passage respectively. The air passage is configured to drive the two lugs to move in opposite directions or towards each other.

6. The easy-to-maintain handle slot forming device according to claim 5, characterized in that: The mold insert is provided with an axially extending sliding channel and two connecting rods slidably connected to the sliding channel. Two lugs are fixedly installed on the two connecting rods respectively. The connecting rods and the mold insert together define a sealed space between the relatively distal end of the connecting rod and the mold insert, and between the relatively proximal end of the connecting rod. The air passage is connected to the sealed space and is used to drive the two connecting rods to move in opposite directions or towards each other.

7. The easy-to-maintain handle slot forming device according to claim 6, characterized in that: The air path includes a first air path and a second air path. The outlet of the first air path is connected to the middle of the sliding channel, and the outlet of the second air path is connected to both ends of the sliding channel.

8. The easy-to-maintain handle slot forming device according to claim 7, characterized in that: The mold insert is provided with a protrusion, and a first air inlet connector and a second air inlet connector are respectively connected to the protrusion. The air inlet end of the first air passage is connected to the first air inlet connector, and the air inlet end of the second air passage is connected to the second air inlet connector.

9. The easy-to-maintain handle slot forming device according to claim 6, characterized in that: The connecting rod has a radially penetrating connecting hole. The outer periphery of the connecting rod has a first recess and a second recess at the penetrating position of the connecting hole. The first guide claw has a snap-fit ​​part and a connecting cylinder. A lug limiting guide hole is provided between the guide channel and the limiting guide block. The width of the first recess and the lug limiting guide hole are both adapted to the snap-fit ​​part. The snap-fit ​​part passes through the lug limiting guide hole and snaps into the first recess. Corresponding to the two connecting rods, the mold insert has two strip-shaped connecting rod limiting guide holes arranged in sequence along the axial direction. A connecting block is provided in the second recess. The connecting cylinder passes through the connecting hole and is fixed to the connecting block. The connecting block is slidably connected to the connecting rod limiting guide hole.

10. A blow molding die, characterized in that: Includes a mold cavity and an easy-to-maintain handle slot forming device according to any one of claims 1-9; The handle slot forming mechanism is installed in the mold cavity, which has a cavity. When the two lugs of the handle slot forming mechanism move in opposite directions or towards each other, the forming ends of the lugs protrude into the cavity or retract into the mold cavity accordingly.

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