A ton bag blowing machine

Abstract

The application relates to a ton barrel blow molding machine, belonging to the field of ton barrel production, comprising two supporting frames, cutting blades are arranged on the sides of the two supporting frames close to each other, installation grooves are arranged on the side faces of the two supporting frames close to each other, supporting blocks are vertically and slidably connected in the installation grooves, the ends of the two cutting blades close to each other are blades, the other ends of the cutting blades are rotating ends, installation grooves are arranged on the side faces of the supporting blocks close to the cutting blades, the rotating ends of the cutting blades are inserted into the corresponding installation grooves and are rotationally connected with the supporting blocks, coarse adjustment mechanisms for driving the supporting blocks to ascend and descend are arranged on the supporting frames, fine adjustment mechanisms for driving the rotating ends of the cutting blades to rotate relative to the supporting blocks are arranged on the supporting frames. The application has the effect of better cutting plastic parison.

Description

Technical Field

[0001] This application relates to the field of tonne container production, and in particular to a tonne container blow molding machine. Background Technology

[0002] IBC (Individual Bulk Container) refers to IBC medium-sized bulk containers, which are essential tools for modern warehousing and transportation of liquid products. Blow molding machines are used for blow molding during the production process of IBC containers.

[0003] A patent with publication number CN211843145U discloses a hollow blow molding machine for urea barrel production, including a base. A fixing frame is fixedly installed on the upper end of the base, and a screw extruder is fixedly installed on the upper end of the inner cavity of the fixing frame. The lower end of the screw extruder is fixedly connected to an injection port. The plastic preform is melted in the screw extruder and extruded quantitatively from the injection port. After the plastic preform is extruded from the injection port, the lower end of the plastic preform is placed in the mold. Then, the first cylinder is activated, which drives two cutting blades to move towards each other, thereby cutting the preform between the mold and the injection port.

[0004] However, if the two cutting blades move towards each other and the ends of the two cutting blades that are close to each other fail to make good contact with each other, the cutting effect of the two cutting blades on the plastic parison will be poor, and the plastic parison may not be cut off. Summary of the Invention

[0005] In order to better cut plastic preforms, this application provides a ton drum blow molding machine.

[0006] The technical solution of the ton drum blow molding machine provided in this application is as follows:

[0007] A blow molding machine for ton containers includes two support frames. Each support frame has a cutting blade mounted on one side close to it. Each support frame has a mounting groove on its side, and a support block is vertically slidably connected to each mounting groove. Each cutting blade has a cutting edge at one end close to it, and a rotating end at the other end. Each support block has a mounting groove on its side close to the cutting blade, and the rotating end of each cutting blade is inserted into the corresponding mounting groove and rotatably connected to the support block. Each support frame is equipped with a coarse adjustment mechanism for raising and lowering the support block, and a fine adjustment mechanism for rotating the rotating end of the cutting blade relative to the support block.

[0008] By adopting the above technical solution, when it is necessary to adjust the two cutting blades to align their cutting edges, the coarse adjustment mechanism first drives the support block to rise and fall, which in turn drives the cutting blades to rise and fall, thus adjusting the height of the two cutting blades until their cutting edges are basically aligned. Then, the fine adjustment mechanism drives the cutting blades to rotate, thus finely adjusting the height of the cutting blades until the cutting edges of the two cutting blades are completely aligned, which facilitates better cutting of the plastic preform.

[0009] Preferably, the coarse adjustment mechanism includes a lead screw that runs vertically through the support block, the lead screw being threadedly connected to the support block, and both ends of the lead screw being rotatably connected to the support frame.

[0010] By adopting the above technical solution, the screw can be rotated in both directions, which can drive the support block to rise and fall vertically along the support groove. This makes it easy to adjust the height of the support block and the operation is simple and convenient.

[0011] Preferably, one end of the lead screw extends out of the outer side of the support frame, and a locking assembly is connected to the lead screw. The locking assembly includes a locking rod, and an elongated hole is formed on the upper surface of the locking rod. The end of the lead screw extending out of the support frame is inserted into the elongated hole and rotatably connected to the locking rod through a rotating shaft. A torsion spring is fixedly connected between the locking rod and the lead screw. A locking groove coaxially arranged with the lead screw is formed on the outer wall of the support frame near the locking rod. A ring of limiting teeth is fixedly connected to the side wall of the locking groove. A plurality of limiting grooves are formed on the side wall of one end of the locking rod. The end of the locking rod with the limiting groove is inserted into the locking groove. Each limiting groove engages with a corresponding limiting tooth.

[0012] By employing the above technical solution, the torsion spring keeps one end of the locking rod inserted into the locking groove. The engagement of the limiting groove and the limiting tooth makes it difficult for the locking rod to rotate around the axis of the lead screw, thus making it difficult for the lead screw to rotate. When it is necessary to rotate the lead screw, rotating the locking rod disengages one end from the locking groove. Rotating the locking rod around the axis of the lead screw then allows it to drive the lead screw to rotate more smoothly. In other words, when it is necessary to rotate the lead screw, holding the locking rod and having it drive the lead screw is less strenuous than directly rotating the lead screw.

[0013] Preferably, the sidewall of the locking groove gradually slopes towards the lead screw along the direction close to the support frame.

[0014] By adopting the above technical solution, the end of the locking rod with the limiting groove can rotate smoothly into the locking groove, thus completing the engagement between the limiting groove and the limiting tooth.

[0015] Preferably, an arc-shaped stop is provided at the edge of the locking groove opening with damping sliding connection, and the arc-shaped stop presses against the upper surface of one end of the locking rod.

[0016] By adopting the above technical solution, the arc-shaped stop block presses against the upper surface of one end of the locking rod, reinforcing the connection between the locking rod and the locking groove and preventing the locking rod from disengaging from the locking groove. When it is necessary to rotate the locking rod to disengage from the locking groove, slide the arc-shaped stop block along the edge of the locking groove until the arc-shaped stop block disengages from the locking rod.

[0017] Preferably, the fine-tuning mechanism includes an adjusting rod, a limiting rod fixedly connected to the side wall of the adjusting rod, a mounting hole penetrating the rotating end on one side wall of the rotating end, a receiving groove on the side wall of the mounting hole, the adjusting rod being inserted into the mounting hole, the limiting rod being inserted into the receiving groove, one end of the adjusting rod being an active section penetrating one side wall of the support block, a receiving hole on the side wall of the support block near the active section, a receiving block being coaxially fixed to the active section, the receiving block being inserted into the receiving hole, a ring of snap-fit ​​grooves on the side wall of the receiving block, a ring of snap-fit ​​rods on the inner side wall of the receiving hole, and each snap-fit ​​rod snapping into a corresponding snap-fit ​​groove.

[0018] By employing the above technical solution, the active section is pulled away from the support block, causing the receiving block to gradually detach from the receiving hole. At this point, rotating the active section causes the limiting rod to rotate, which in turn rotates the cutting blade, thus adjusting the blade height. After adjusting the blade height, the active section is pushed closer to the receiving hole until the receiving block is inserted into the hole. At this point, each locking rod engages with its corresponding locking slot, locking the adjusting rod and the cutting blade angle.

[0019] Preferably, an adjusting block is fixedly connected to the outer wall of the support block where the receiving hole is provided. An adjusting hole is provided on one side wall of the adjusting block and is coaxially arranged with the receiving hole. A ring of plastic adjusting pieces is fixedly connected in the adjusting hole. Each adjusting piece is aligned with one of the locking rods. When the receiving block is disengaged from the receiving hole and inserted into the adjusting hole, each locking groove is locked with a corresponding adjusting piece.

[0020] By employing the above technical solution, pulling the active section away from the receiving hole causes the receiving block to disengage from the receiving hole and insert into the adjusting hole. At this point, each locking rod engages with its corresponding adjusting plate. Rotating the active section causes the receiving block to rotate, at which point each locking groove on the side wall of the receiving block disengages from its corresponding adjusting plate and engages with its corresponding adjusting plate. Thus, the cutting blade completes a certain angle of rotation. The adjusting plates facilitate a relatively slow rotation of the cutting blade, preventing the blade from rotating a large angle at once and ensuring proper alignment of the two cutting edges.

[0021] Preferably, the inner sidewall of the support block away from the active section has a groove, a transition block is rotatably connected in the groove, a reset groove is formed on the sidewall of the transition block near the adjusting rod, a reset block is slidably connected in the reset groove, one end of the adjusting rod is fixedly connected to the reset block, a guide block is fixedly connected to the sidewall of the reset block, a guide groove is formed on the inner wall of the reset groove, the guide block is slidably connected to the guide groove, and a reset spring is fixedly connected between the reset block and the inner bottom wall of the reset groove.

[0022] By adopting the above technical solution, when the active section is pulled to insert the receiving block into the adjusting hole, the return spring is stretched. At this time, rotating the adjusting rod will cause the limiting block, guide block, and transition block to rotate together. When it is no longer necessary to rotate the adjusting rod, and external force is stopped from being applied to the adjusting rod, the adjusting rod will complete its reset under the force of the return spring, and the receiving block will also reset into the receiving hole.

[0023] In summary, this application includes at least one of the following beneficial technical effects:

[0024] The blade height of the two cutting blades is adjusted by the coarse adjustment mechanism and the fine adjustment mechanism until the two blades are completely aligned, so that the cutting blades can cut the plastic preform better.

[0025] Holding the locking lever makes it easier to rotate the lead screw than to rotate the lead screw directly;

[0026] The adjustment plate allows for a slower rotation of the cutting blade, preventing the blade from rotating too far at once and ensuring proper alignment of the two cutting edges. Attached Figure Description

[0027] Figure 1 This is a schematic diagram illustrating the overall structure of the blow molding machine as described in the embodiments of this application.

[0028] Figure 2 This is a schematic diagram illustrating the structure of the cutting mechanism in an embodiment of this application.

[0029] Figure 3 This is a schematic diagram illustrating the structure of the coarse adjustment mechanism in an embodiment of this application.

[0030] Figure 4 This is a schematic diagram illustrating the structure of the fine-tuning mechanism in an embodiment of this application.

[0031] Figure 5 This is a schematic diagram illustrating the structure of the receiving block in an embodiment of this application.

[0032] Figure 6 This is a schematic diagram illustrating the structure of the adjustment block in an embodiment of this application.

[0033] Figure 7This is a schematic diagram illustrating the structure of the reset spring in an embodiment of this application.

[0034] Explanation of reference numerals in the attached drawings: 1. Support frame; 2. Screw extruder; 21. Extrusion tube; 3. Die; 4. Cutting mechanism; 41. Support frame; 411. Support groove; 412. Locking groove; 413. Limiting tooth; 414. Receiving hole; 4141. Snap-fit ​​rod; 415. Groove; 42. Cutting blade; 421. Blade; 422. Rotating end; 4221. Mounting hole; 4222. Receiving groove; 43. Drive cylinder; 44. Support block; 441. Mounting groove; 5. 51. Coarse adjustment mechanism; 6. Lead screw; 7. Fine adjustment mechanism; 61. Adjusting rod; 611. Active section; 62. Limiting rod; 63. Receiving block; 631. Snap-fit ​​groove; 64. Adjusting block; 641. Adjusting hole; 642. Adjusting plate; 65. Transition block; 651. Reset groove; 652. Guide groove; 66. Reset block; 67. Reset spring; 68. Guide block; 7. Locking assembly; 71. Locking rod; 711. Long hole; 712. Limiting groove; 72. Arc-shaped stop block. Detailed Implementation

[0035] The following is in conjunction with the appendix Figure 1-7 This application will be described in further detail.

[0036] This application discloses a blow molding machine for ton drums. (Refer to...) Figure 1 The ton-shaped blow molding machine includes a support frame 1, a screw extruder 2 fixedly connected to the inner top wall of the support frame 1, and a mold 3 fixedly connected to the inner bottom wall of the support frame 1. The screw extruder 2 includes a vertically downward-facing extrusion tube 21 for extruding a plastic preform downwards. A cutting mechanism 4 for cutting the plastic preform is connected to the support frame 1.

[0037] Reference Figure 1 and Figure 2 The cutting mechanism 4 includes two support frames 41 and a telescopic assembly. The extrusion tube 21 is located between the two support frames 41, and cutting blades 42 are installed on the sides of the two support frames 41 that are close to each other. The telescopic assembly is used to drive the two support frames 41 to move towards or away from each other. The telescopic assembly includes two drive cylinders 43, one drive cylinder 43 corresponding to one support frame 41. The piston rod of each drive cylinder 43 is fixedly connected to the side wall of the corresponding support frame 41 away from the extrusion tube 21, and the other end of each drive cylinder 43 is fixedly connected to the support frame 1.

[0038] The two cutting blades 42 have blades 421 at their ends that are close to each other. When the two drive cylinders 43 are activated at the same time, the piston rods of the two drive cylinders 43 move towards each other, which pushes the two support frames 41 to move towards each other. The two support frames 41 move towards each other, which drives the two cutting blades 42 to move towards each other. In this way, the two cutting blades 42 can cut the plastic preform.

[0039] Reference Figure 2 and Figure 3 In order to facilitate the alignment of the blades 421 of the two cutting blades 42, each support frame 41 is equipped with a coarse adjustment mechanism 5 that drives the corresponding cutting blade 42 to rise and fall, and a fine adjustment mechanism 6 that drives the corresponding cutting blade 42 to rotate.

[0040] The coarse adjustment mechanism 5 drives the cutting blade 42 to rise and fall, thereby aligning the two blades 421. Then, the fine adjustment mechanism 6 drives the cutting blade 42 to rotate until the two blades 421 are on the same horizontal line, at which point the two blades 421 are completely aligned.

[0041] The two support frames 41 are provided with support grooves 411 on their sides that are close to each other. The end of each cutting blade 42 away from the blade 421 is a rotating end 422. A support block 44 is installed on the rotating end 422. The support block 44 is vertically slidably connected to the support groove 411.

[0042] The coarse adjustment mechanism 5 includes a lead screw 51, which vertically passes through the support frame 41 and is rotatably connected to the support frame 41. The lead screw 51 is threadedly connected to the support block 44. Rotating the lead screw 51 in both directions causes the support block 44 and the cutting blade 42 to move vertically up and down along the support groove 411.

[0043] To lock the lead screw 51, a locking assembly 7 is connected to the lead screw 51. The locking assembly 7 includes a locking rod 71, the upper surface of which has an elongated hole 711 through which the lead screw 51 is inserted. The upper end of the lead screw 51 is inserted into the elongated hole 711, and the locking rod 71 and the lead screw 51 are rotatably connected via a rotating shaft. Both ends of the rotating shaft are fitted with torsion springs, one end of each torsion spring being fixedly connected to the lead screw 51, and the other end being fixedly connected to the locking rod 71. A locking groove 412 is formed on the outer top wall of the support frame 41, and the locking groove 412 is coaxially arranged with the lead screw 51. The side wall of the locking groove 412 gradually slopes from top to bottom towards the lead screw 51, that is, the locking groove 412 is flared.

[0044] One end of the locking rod 71 has an arc-shaped sidewall with several limiting grooves 712. Several elastic limiting protrusions 413 are fixedly connected to the sidewall of the locking groove 412, and these protrusions 413 are evenly distributed around the axis of the locking groove 412. The end of the locking rod 71 with the arc-shaped sidewall is inserted into the locking groove 412, and the limiting groove 712 engages with the limiting protrusions 413. The locking rod 71 is in an inclined state, and the torsion spring is in its normal state. At this time, the locking rod 71 is difficult to rotate along the axis of the lead screw 51 within the locking groove 412, and the lead screw 51 is locked.

[0045] When it is necessary to rotate the lead screw 51, rotate the locking rod 71 until the end of the locking rod 71 with the arc-shaped sidewall rotates upward and disengages from the locking groove 412. At this time, rotating the locking rod 71 around the axis of the lead screw 51 will drive the lead screw 51 to rotate, thus facilitating the adjustment of the lifting and lowering of the cutting blade 42. The locking rod 71 not only facilitates locking the lead screw 51, but also makes it easier to rotate the lead screw 51 with less effort.

[0046] To reinforce the engagement between the locking rod 71 and the locking groove 412, thereby ensuring a more stable locked state for the lead screw 51, a damped sliding block 72 is provided at the upper edge of the locking groove 412. The arc-shaped block 72 can slide along the upper edge of the locking groove 412. When one end of the locking rod 71 is inserted into the locking groove 412, the arc-shaped block 72 is moved until it presses against the upper surface of one end of the locking rod 71. At this point, the arc-shaped block 72 prevents the locking rod 71 from disengaging from the locking groove 412.

[0047] A mounting groove 441 is provided on one side of the support block 44, and the rotating end 422 of the cutting blade 42 is inserted into the mounting groove 441. (See reference) Figure 4 The fine-tuning mechanism 6 includes an adjusting rod 61, with a pair of limiting rods 62 fixedly connected to the arc-shaped sidewall of the adjusting rod 61. A mounting hole 4221, extending laterally through the rotating end 422, is provided on one sidewall of the rotating end 422. A pair of receiving grooves 4222 are provided on the sidewall of the mounting hole 4221. The adjusting rod 61 is inserted into the mounting hole 4221, and one limiting rod 62 corresponds to one receiving groove 4222. The limiting rod 62 is inserted into the receiving groove 4222. One end of the adjusting rod 61 is designated as an active section 611, which penetrates one sidewall of the support block 44.

[0048] Reference Figure 4 , Figure 5 and Figure 6A receiving hole 414 is provided on one side wall of the support block 44 near the active section 611. Several locking rods 4141 are fixedly connected to the inner side wall of the receiving hole 414, and these locking rods 4141 are evenly distributed along the axis of the receiving hole 414. A receiving block 63 is coaxially fixedly connected to the side wall of the active section 611. The receiving block 63 is cylindrical, and several locking grooves 631 are evenly provided on its side wall. The receiving block 63 is inserted into the receiving hole 414, and each locking rod 4141 engages with one locking groove 631.

[0049] When the cutting blade 42 needs to be rotated, the active section 611 is pulled away from the support block 44. The active section 611 drives the receiving block 63 to gradually move away from the receiving hole 414. This continues until the receiving section disengages from the receiving hole 414, at which point each locking rod 4141 disengages from the locking groove 631. During this process, the adjusting rod 61 moves along the mounting hole 4221, and the limiting rod 62 moves along the receiving groove 4222. Rotating the active section 611 causes the receiving block 63 and each limiting rod 62 to rotate, and the adjusting rod 61 drives the cutting blade 42 to rotate via the limiting rods 62.

[0050] An adjusting block 64 is fixedly connected to one outer wall of the support block 44 near the active section 611. One side wall of the adjusting block 64 has an adjusting hole 641, coaxially aligned with and of the same size as the receiving hole 414. Several elastic adjusting pieces 642 are fixedly connected to the inner wall of the adjusting hole 641. These pieces are evenly distributed along the side wall of the adjusting hole 641, with each adjusting piece 642 corresponding to a locking rod 4141. Each adjusting rod 61 is aligned with its corresponding locking rod 4141. When the active section 611 is pulled away from the support block 44 until the receiving block 63 disengages from the receiving hole 414 and inserts into the adjusting hole 641, each adjusting piece 642 engages with its corresponding locking groove 631.

[0051] Because the adjusting plate 642 is elastic, when the active section 611 is rotated, the active section 611 drives the receiving block 63 to rotate. Each adjusting plate 642 disengages from the corresponding locking groove 631 and locks into the adjacent locking groove 631. This makes it easy to slowly rotate the adjusting rod 61, thereby finely adjusting the position of the blade 421 at one end of the cutting blade 42.

[0052] Reference Figure 4 and Figure 7A groove 415 is formed on the inner side wall of the support block 44 away from the active section 611. A transition block 65 is rotatably connected within the groove 415. A reset groove 651 is formed at the end of the transition block 65 near the adjusting rod 61. A reset block 66 is fixedly connected to one end of the adjusting rod 61, and the reset block 66 is slidably connected to the reset groove 651. A reset spring 67 is provided between the reset block 66 and the bottom wall of the reset groove 651. One end of the reset spring 67 is fixedly connected to the reset block 66, and the other end is fixedly connected to the bottom wall of the reset groove 651.

[0053] Reference Figure 5 , Figure 6 and Figure 7 A pair of guide blocks 68 are fixedly connected to the side wall of the reset block 66, and two guide grooves 652 are formed on the inner side wall of the reset groove 651. One guide block 68 corresponds to one guide groove 652, and the guide block 68 and the guide groove 652 are slidably connected. When the receiving block 63 is inserted into the receiving hole 414, the reset spring 67 is in the normal state.

[0054] When the receiving block 63 is inserted into the adjusting hole 641, the return spring 67 is stretched. At this time, rotating the adjusting rod 61 causes the return block 66 to rotate. The rotation of the return block 66, in turn, causes the transition block 65 to rotate via the guide block 68. Thus, the setting of the return spring 67 does not affect the rotation of the adjusting rod 61. When the external force applied to the adjusting rod 61 is stopped, the return block 66 and the adjusting rod 61 are reset under the force of the return spring 67. The receiving block 63 is also reset until it is inserted into the receiving hole 414, and each locking rod 4141 is inserted into the corresponding locking groove 631.

[0055] The implementation principle of a blow molding machine for ton drums according to an embodiment of this application is as follows: When it is necessary to adjust the blades 421 of two cutting blades 42 to be aligned with each other, the two cutting blades 42 are adjusted to move towards each other through the telescopic component until the two blades 421 are close to each other to a position that makes it easy to judge whether the blades 421 are aligned. The arc-shaped stop 72 is slid until the arc-shaped stop 72 disengages from the locking rod 71. Then the locking rod 71 is rotated until one end of the locking rod 71 disengages from the locking groove 412. The locking rod 71 is rotated around the axis of the lead screw 51. The rotation of the locking rod 71 drives the lead screw 51 to rotate. The rotation of the lead screw 51 drives the support block 44 and the cutting blades 42 to rise and fall until the blades 421 of the two cutting blades 42 are basically aligned.

[0056] Pull the active section 611 further away from the support frame 41 until the receiving block 63 is fully inserted into the adjusting hole 641. At this time, rotate the active section 611. The rotation of the active section 611 will cause the adjusting rod 61 to rotate, and the rotation of the adjusting rod 61 will adjust the rotation of the cutting blade 42. When the two blades 421 are fully aligned, release the active section 611. The adjusting rod 61 will be reset by the force of the return spring 67. At this time, the receiving block 63 will resume its insertion into the receiving hole 414, and each locking rod 4141 will be inserted into the corresponding locking groove 631. The active section 611 will be difficult to continue rotating, and the cutting blade 42 will be difficult to continue rotating, that is, the cutting blade 42 will be locked.

[0057] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A blow molding machine for ton drums, comprising two support frames (41), each of the two support frames (41) having a cutting blade (42) mounted on one side close to the other, characterized in that: Each of the two support frames (41) has a mounting groove (441) on one side that is close to each other. Each mounting groove (441) has a support block (44) that is vertically slidably connected. Each of the two cutting blades (42) has a blade (421) on one side that is close to each other. Each cutting blade (42) has a rotating end (422) on the other side. Each support block (44) has a mounting groove (441) on one side that is close to the cutting blade (42). The rotating end (422) of each cutting blade (42) is inserted into the corresponding mounting groove (441) and rotatedly connected to the support block (44). Each support frame (41) is equipped with a coarse adjustment mechanism (5) that drives the support block (44) to rise and fall, and a fine adjustment mechanism (6) that drives the rotating end (422) of the cutting blade (42) to rotate relative to the support block (44). The fine-tuning mechanism (6) includes an adjusting rod (61), a limiting rod (62) is fixedly connected to the side wall of the adjusting rod (61), a mounting hole (4221) is provided on one side wall of the rotating end (422) through the rotating end (422), a receiving groove (4222) is provided on the side wall of the mounting hole (4221), the adjusting rod (61) is inserted into the mounting hole (4221), the limiting rod (62) is inserted into the receiving groove (4222), one end of the adjusting rod (61) is the active section (611) and the active section (61) 1) A receiving hole (414) is provided on one side wall of the support block (44) near the active section (611). The active section (611) is coaxially fixed with a receiving block (63). The receiving block (63) is inserted into the receiving hole (414). A ring of snap-fit ​​grooves (631) is provided on the side wall of the receiving block (63). A ring of snap-fit ​​rods (4141) is provided on the inner side wall of the receiving hole (414). Each snap-fit ​​rod (4141) is snapped into a corresponding snap-fit ​​groove (631). An adjusting block (64) is fixedly connected to the outer wall of the support block (44) having a receiving hole (414). An adjusting hole (641) is opened on one side wall of the adjusting block (64) and is coaxially arranged with the receiving hole (414). A ring of adjusting pieces (642) is fixedly connected in the adjusting hole (641). Each adjusting piece (642) is aligned with one of the locking rods (4141). When the receiving block (63) is disengaged from the receiving hole (414) and inserted into the adjusting hole (641), each locking groove (631) is locked with a corresponding adjusting piece (642). The adjusting plate (642) is elastic. When the active section (611) is rotated, the active section (611) drives the receiving block (63) to rotate. Each adjusting plate (642) disengages from the corresponding locking groove (631) and locks into the adjacent locking groove (631). This makes it easy to slowly rotate the adjusting rod (61) and then finely adjust the position of the blade (421) at one end of the cutting blade (42).

2. The ton drum blow molding machine according to claim 1, characterized in that: The coarse adjustment mechanism (5) includes a lead screw (51) that runs vertically through the support block (44). The lead screw (51) is threadedly connected to the support block (44), and both ends of the lead screw (51) are rotatably connected to the support frame (41).

3. The ton drum blow molding machine according to claim 2, characterized in that: One end of the lead screw (51) extends out of the outside of the support frame (41). A locking assembly (7) is connected to the lead screw (51). The locking assembly (7) includes a locking rod (71). An elongated hole (711) is provided on the upper surface of the locking rod (71). One end of the lead screw (51) extending out of the support frame (41) is inserted into the elongated hole (711) and rotatably connected to the locking rod (71) through a rotating shaft. A torsion spring is fixedly connected between the locking rod (71) and the lead screw (51). The outer side wall of the support (41) near the locking rod (71) is provided with a locking groove (412) coaxially arranged with the lead screw (51). A ring of limiting teeth (413) is fixedly connected to the side wall of the locking groove (412). A number of limiting grooves (712) are provided on the side wall of one end of the locking rod (71). The end of the locking rod (71) with the limiting groove (712) is inserted into the locking groove (412). Each limiting groove (712) is engaged with a corresponding limiting tooth (413).

4. A blow molding machine for ton drums according to claim 3, characterized in that: The sidewall of the locking groove (412) gradually slopes towards the lead screw (51) from the direction of the support frame (41).

5. A blow molding machine for ton drums according to claim 3, characterized in that: An arc-shaped stop (72) is damped and slidably connected at the edge of the opening of the locking groove (412), and the arc-shaped stop (72) presses against the upper surface of one end of the locking rod (71).

6. A blow molding machine for ton drums according to claim 1, characterized in that: The support block (44) has a groove (415) on its inner sidewall away from the active section (611). A transition block (65) is rotatably connected in the groove (415). A reset groove (651) is provided on the sidewall of the transition block (65) near the adjusting rod (61). A reset block (66) is slidably connected in the reset groove (651). One end of the adjusting rod (61) is fixedly connected to the reset block (66). A guide block (68) is fixedly connected to the sidewall of the reset block (66). A guide groove (652) is provided on the inner wall of the reset groove (651). The guide block (68) is slidably connected to the guide groove (652). A reset spring (67) is fixedly connected between the reset block (66) and the inner bottom wall of the reset groove (651).

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