A blow mold for a large bucket

Abstract

This utility model discloses a blow molding mold for large barrels, including a support frame and a first station, a second station, and a third station sequentially arranged on the support frame. The first station is equipped with a main mold for blow molding the barrel. The second station is equipped with a secondary mold for removing the upper and lower sprue outlets of the barrel and for re-blowing and cooling the barrel. The third station is equipped with a handle sprue removal device for removing the sprue outlet at the barrel handle. This utility model has the advantages of reducing product deformation, automating the removal of sprue tail material, shortening the blow molding cycle, and improving production efficiency.

Description

Technical Field

[0001] This utility model relates to the field of blow molding mold technology, and in particular to a blow molding mold for large barrels. Background Technology

[0002] In the plastics manufacturing industry, especially in the blow molding process of 25L large-capacity containers, a series of technical challenges exist. Firstly, the large size and thick walls of the products result in significant deformation during blow molding, making it difficult to guarantee dimensional accuracy and consistency. Secondly, the thick walls also lead to longer blow molding cycles and lower production efficiency. Furthermore, large containers typically require high sealing at the nozzle, posing additional challenges to mold design and manufacturing. Traditional production processes usually require manual removal of sprue residue, which not only increases labor costs but may also affect product appearance and production efficiency. Therefore, existing blow molding molds and production processes for large containers have limitations in terms of product quality, production efficiency, and cost control, and urgently need improvement.

[0003] Therefore, it is necessary to further improve and perfect the existing technology to overcome these shortcomings, and this utility model is made based on this situation. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings of the existing technology and provide a blow molding die for large barrels that reduces product deformation, automates the removal of sprue tailings, shortens the blow molding cycle, and improves production efficiency.

[0005] This utility model is achieved through the following technical solution:

[0006] To solve the above-mentioned technical problems, this utility model provides a blow molding mold for a large barrel, including a support and a first station, a second station and a third station arranged sequentially on the support. The first station is provided with a main mold for blow molding the barrel, the second station is provided with a secondary mold for removing the upper and lower water inlets of the barrel and for re-blowing and cooling the barrel, and the third station is provided with a handle water inlet removal device for removing the water inlet at the handle of the barrel.

[0007] To further address the technical problems addressed by this utility model, a blow molding mold for a large barrel is provided. The main mold includes a main mold body and a first lower mold body located below the main mold body and capable of opening and closing relative to it. The main mold body has a first upper cavity, and the first lower mold body has a first lower cavity. The first upper cavity and the first lower cavity are joined together to form a first blow molding cavity. The upper end of the main mold body has a blow molding port, and a demolding drive mechanism for driving the first lower mold body to rise and fall to achieve opening and closing is provided between the first lower mold body and the main mold body.

[0008] To further address the technical problems addressed by this utility model, a blow molding mold for a large barrel is provided. The sub-mold includes a sub-mold body, with a top cover detachably connected to the upper end of the sub-mold body. A second lower mold capable of lifting and lowering is provided at the lower end of the sub-mold body. The sub-mold body has a central cavity, the top cover contains a second upper cavity, and the second lower mold contains a second lower cavity. The second upper cavity, central cavity, and second lower cavity are joined to form a second blow molding cavity.

[0009] A locking mechanism is provided between the upper cover, the sub-mold body, and the second lower mold to lock the three together;

[0010] The top cover is provided with a bucket mouth support directly above the bucket mouth. The bucket mouth support is provided with a lifting driver. The output end of the lifting driver is provided with a pen that can be inserted into the bucket mouth. The pen is connected to an air pipe for blowing air into the bucket to shape it, and a water pipe for cooling the bucket mouth.

[0011] The upper side of the sub-mold body is provided with an upper push plate for pushing off the water outlet at the top of the bucket, and a first drive mechanism for driving the upper push plate to move in and out.

[0012] The other side of the upper end of the sub-mold body is provided with a baffle for pushing the sprue material outside the mold, and a second drive mechanism for driving the baffle to move in and out.

[0013] The bottom surface of the second lower mold is provided with a slot, and a push plate for breaking the tail material at the bottom of the barrel is provided in the slot. The push plate is connected to a push driver for driving the push plate to move laterally.

[0014] To further address the technical problems addressed by this utility model, a large barrel blow molding mold is provided by this utility model. The locking mechanism includes several guide blocks disposed on the side of the sub-mold body, and a guide rod slidably connected to the guide blocks. A fixing block is provided on the side of the second lower mold. The lower end of the guide rod is connected to the fixing block. A first locking driver is provided on the fixing block, and the output end of the first locking driver is connected to the corresponding guide block. A bolt seat is provided at the upper end of the guide rod, and a second locking driver is provided on the bolt seat. A bolt head is provided at the output end of the second locking driver. A locking block is provided at a corresponding position on the side of the upper cover, and the bolt head can extend laterally towards the locking block and pull it downwards.

[0015] To further solve the technical problems to be solved by this utility model, the present utility model provides a blow molding mold for a large barrel, wherein the first driving mechanism and the second driver mechanism are both two-stage stroke linear drive structures. The two-stage stroke linear drive structure includes a first-stage support plate on a bracket, a first-stage linear driver on the first-stage support plate, a second-stage support plate on the output end of the first-stage linear driver, a second-stage linear driver on the second-stage support plate, and the upper push plate or baffle is connected to the output end of the corresponding second-stage linear driver.

[0016] In order to further solve the technical problems to be solved by this utility model, the present utility model provides a large barrel blow molding mold in which a first circulating water channel is provided in both the main mold body and the first lower mold body.

[0017] In order to further solve the technical problems to be solved by this utility model, the present utility model provides a large barrel blow molding mold in which the sub-mold body, the upper cover and the second lower mold are all provided with a second circulating water channel.

[0018] In order to further solve the technical problems to be solved by this utility model, this utility model provides a blow molding mold for a large barrel, wherein the main mold and the auxiliary mold are both divided into left and right halves, the support includes a first clamping plate arranged opposite to the left and right sides of the main mold, and a second clamping plate arranged opposite to the left and right sides of the auxiliary mold, the two first clamping plates are fixedly connected by a crossbeam, and a locking structure is provided between the two second clamping plates;

[0019] The locking structure includes a locking arm and a locking sleeve respectively disposed on the left and right second clamping plates. The locking arm and the locking sleeve are inserted together, and the locking arm is provided with a locking hole. The locking sleeve is provided with a third locking driver, and the output end of the third locking driver is provided with a locking head that can be selectively inserted into different locking holes.

[0020] To further address the technical problems addressed by this utility model, a large barrel blow molding mold is provided in which a connecting plate is provided between the two first clamping plates and the two second clamping plates. The connecting plate is provided with a plurality of longitudinal and transverse strip-shaped assembly holes. Both the first clamping plates and the second clamping plates are provided with mounting holes. The strip-shaped assembly holes and the corresponding mounting holes on the first clamping plates or the corresponding mounting holes on the second clamping plates are fixed together by fasteners, thereby aligning the positions of the main mold and the sub-mold.

[0021] To further address the technical problems addressed by this utility model, a blow molding mold for a large barrel is provided by this utility model. The handle sprue removal device includes a clamping frame, several jaws disposed on the clamping frame and capable of opening and closing for clamping the barrel body, a clamping driver for driving the jaws to open and close, and an arc-shaped cutting component for removing the sprue from the handle. The clamping frame is provided with an adjusting frame, the middle part of the cutting component is rotatably connected to the adjusting frame, the free end of the cutting component is provided with a cutting edge, and the other end of the cutting component is connected to a cutting driver for driving its rotation.

[0022] Compared with the prior art, the present invention has the following advantages:

[0023] 1. The large barrel blow molding mold of this utility model innovatively adopts a multi-station collaborative working mode, integrating traditional blow molding, sprue removal and secondary shaping processes into the same mold group. The main mold in the first station completes the blow molding of the barrel body, the auxiliary mold in the second station realizes the secondary shaping of the barrel body and the automatic removal of the upper and lower sprues, and the sprue removal device in the third station completes the automatic removal of sprue material at the handle. This realizes a high degree of automation in the large barrel blow molding process, greatly improves production efficiency and effectively reduces labor costs.

[0024] 2. The locking mechanism of the second station sub-mold in this utility model, through the coordinated action of the first locking driver and the second locking driver, can tightly lock the upper cover, sub-mold body and the second lower mold of the sub-mold, effectively preventing the mold from separating due to force during the blowing process, ensuring the dimensional accuracy and appearance quality of the barrel, and improving the product qualification rate.

[0025] 3. The upper sprue removal mechanism of this utility model adopts a two-stage stroke linear drive structure. This compact drive design can achieve a longer stroke in a limited space, ensuring that the sprue material can be smoothly pushed out of the mold, avoiding the impact of sprue material residue on subsequent processes, and further improving production efficiency and product quality.

[0026] 4. The adjustable handle spout removal device of this utility model can precisely control the position and angle of the cutting part by adjusting the connection position of the cutting part on the adjustment frame, adapting to the spout removal needs of bucket handles of different sizes and shapes, ensuring that large buckets of various specifications can achieve efficient and accurate spout removal, and has a wider range of applicability. Attached Figure Description

[0027] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings, wherein:

[0028] Figure 1 This is a three-dimensional structural schematic diagram of the present invention;

[0029] Figure 2 This is a sectional view of the first workstation;

[0030] Figure 3 This is a schematic diagram of the three-dimensional structure of the second workstation;

[0031] Figure 4 This is an exploded view of the second workstation;

[0032] Figure 5 This is a sectional view of the second workstation;

[0033] Figure 6 This is a schematic diagram of the three-dimensional structure of the third workstation;

[0034] Figure 7 This is a sectional view of the third workstation. Detailed Implementation

[0035] To enable those skilled in the art to better understand the technical solution of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0036] like Figures 1 to 7 As shown, this utility model provides a blow molding mold for large barrels of 25L and above. The mold includes a support 1, and a first station, a second station and a third station arranged sequentially on the support 1.

[0037] The first workstation is equipped with a main mold 2 for blow molding the barrel. During the blow molding process, molten plastic preform enters the main mold 2, expands under air and adheres tightly to the mold cavity wall, and cools and solidifies to form the barrel body. Furthermore, the main mold 2 includes a main mold body 21 and a first lower mold body 22 located below the main mold body 21 and capable of opening and closing relative to it. The main mold body 21 has a first upper cavity 211, and the first lower mold body 22 has a first lower cavity 221. The first upper cavity 211 and the first lower cavity 221 are joined to form a first blow molding cavity, the shape of which determines the shape of the barrel body. The upper end of the main mold body 21 has a blow molding port 212 for connecting an air blowing device to introduce compressed air into the preform. A demolding drive mechanism 23 is provided between the first lower mold body 22 and the main mold body 21 to drive the first lower mold body 22 to rise and fall to achieve opening and closing.

[0038] like Figures 1-2 As shown, the demolding drive mechanism 23 includes a hydraulic cylinder or pneumatic cylinder fixed to the side of the main mold body 21, and its output end is connected to the first lower mold body 22. Under the action of the hydraulic cylinder, the first lower mold body 22 can move downward, so that the blow-molded barrel can be demolded smoothly, avoiding damage to the barrel due to forced pulling.

[0039] To improve blow molding efficiency, a first circulating water channel, i.e. a water transport channel, is provided in both the main mold body 21 and the first lower mold body 22. During the blow molding of the product (bucket), the circulating water can quickly remove the heat of the product, accelerate the cooling process, and shorten the product molding cycle.

[0040] The blow-molded barrel is transferred to a second station by a robotic arm or manually. The second station has a sub-mold 3, used to remove the top and bottom inlets of the barrel, and to re-blow and cool the barrel, further shaping it and improving the stability of its dimensions and appearance, thus accelerating the mold cycle and reducing production costs. The sub-mold 3 includes a sub-mold body 31, with a detachable top cover 32 connected to its upper end. A movable second lower mold 33 is located at the lower end of the sub-mold body 31. The sub-mold body 31 has a central cavity 311, the top cover 32 contains a second upper cavity 321, and the second lower mold 33 contains a second lower cavity 331. The second upper cavity 321, central cavity 311, and second lower cavity 331 are joined to form a second blow molding cavity. The shape of the second blow molding cavity is basically consistent with the shape of the barrel, facilitating secondary shaping of the barrel.

[0041] To ensure a tight seal during the blowing process, a locking mechanism 37 is provided between the upper cover 32, the sub-mold body 31, and the second lower mold 33 to lock them together. The locking mechanism 37 tightly binds the upper cover 32, the sub-mold body 31, and the second lower mold 33 together, preventing separation during blowing and thus avoiding product deformation or damage. Furthermore, the locking mechanism 37 includes several guide blocks 371 on the side of the sub-mold body 31 and guide rods 372 slidably connected to the guide blocks 371. A fixing block 373 is provided on the side of the second lower mold 33. The lower end of the guide rods 372 is connected to the fixing block 373. A first locking actuator 374 (such as a cylinder or hydraulic cylinder) is provided on the fixing block 373. The output end of the first locking actuator 374 is connected to the corresponding guide block 371. Driven by the first locking actuator 374, the sub-mold body 31 and the second lower mold 33 can be tightly bound together. Secondly, the upper end of the guide rod 372 is provided with a bolt seat 375, and the bolt seat 375 is provided with a second locking actuator 376 (such as a cylinder or hydraulic cylinder). The output end of the second locking actuator 376 is provided with a bolt head 3761, and a locking block 377 is provided at a corresponding position on the side of the upper cover 32. The bolt head 3761 can extend laterally toward the locking block 377 and pull it downward. Under the action of the second locking actuator 376, the extended bolt head 3761 can cooperate with the locking block 377 and pull it downward, thereby realizing the locking of the upper cover 32.

[0042] To ensure the stability of the barrel opening size, the upper cover 32 is provided with a barrel opening support 322 directly above the barrel opening. The barrel opening support 322 is provided with a lifting driver 323 (such as a cylinder or hydraulic cylinder). The output end of the lifting driver 323 is provided with a pen (not shown in the figure) that can be inserted into the barrel opening. The pen is connected to an air pipe (not shown in the figure) for blowing air into the barrel to shape it, and a water pipe (not shown in the figure) for cooling the barrel opening, so as to ensure the stability of the barrel opening size and meet the sealing requirements.

[0043] To remove the sprue material from the top of the barrel, one side of the upper end of the sub-mold body 31 is provided with an upper push plate 34 for pushing off the sprue material, and a first drive mechanism for driving the upper push plate 34 to move in and out. The other side of the upper end of the sub-mold body 31 is provided with a baffle 35 for pushing the sprue material outside the mold, and a second drive mechanism for driving the baffle 35 to move in and out. Typically, the upper cover 32 needs to be removed first, and then the sprue material is removed by sequentially using the upper push plate 34 and the baffle 35.

[0044] To save space, both the first and second drive mechanisms are two-stage linear drive structures, solving the problem of carrying out sprue material over long distances even when machine space is limited. The two-stage linear drive structure includes primary support plates 341 and 351 mounted on a bracket 1. Primary linear drivers 342 and 352 are mounted on the primary support plates 341 and 351. Secondary support plates 343 and 353 are mounted on the output ends of the primary linear drivers 342 and 352. Secondary linear drivers 344 and 354 are mounted on the secondary support plates 343 and 353. The upper push plate 34 or baffle 35 is connected to the output ends of the corresponding secondary linear drivers 344 and 354.

[0045] To remove the tail material at the bottom of the barrel, the bottom surface of the second lower mold 33 is provided with a slot 332. A push plate 36 for breaking the tail material at the bottom of the barrel is provided in the slot 332. The push plate 36 is connected to a push driver 361 (such as a cylinder or hydraulic cylinder) for driving the push plate 36 to move laterally. Under the push of the push driver 361, the push plate 36 has the function of breaking the tail material at the bottom of the barrel, saving labor costs and reducing production costs.

[0046] To further cool the barrel, the sub-mold 31, the upper cover 32, and the second lower mold 33 are all equipped with a second circulating water channel, i.e., a water transport channel, which serves to further cool the product.

[0047] After the top and bottom sprues are removed and the barrel is shaped twice, it is transferred to the third workstation. The third workstation is equipped with a handle sprue removal device 4, which automatically removes sprue material from the handle area, reducing production costs. Since the handle is typically bridge-shaped, sprue residue remains inside the handle. The handle sprue removal device 4 includes a clamping frame 41, several opening and closing grippers 42 mounted on the clamping frame 41 for clamping the barrel, a clamping actuator 43 (such as a cylinder or hydraulic cylinder) for driving the grippers 42 to open and close, and an arc-shaped cutting element 44 for removing the sprue residue from the handle. The grippers 42 clamp and stabilize the product, preparing it for the next step. Specifically, the cutting element 44 is hook-shaped, and its free end has a cutting edge 441. When the hook-shaped cutting element 44 rotates, it can quickly and easily cut off the sprue residue inside the handle.

[0048] To accommodate barrels of different sizes, the clamping frame 41 is equipped with an adjusting frame 45, and the middle part of the cutting component 44 is rotatably connected to the adjusting frame 45. The adjusting frame 45 has multiple shaft holes, and the cutting component 44 can be selectively rotatably connected to the shaft hole of the corresponding position to achieve fine adjustment of the position of the cutting component 44. The other end of the cutting component 44 is connected to a cutting actuator 46 (such as a cylinder or hydraulic cylinder) for driving its rotation. Driven by the cutting actuator 46, the hook-shaped cutting component 44 can automatically remove the sprue material at the handle position, saving labor costs and reducing production costs.

[0049] Furthermore, to ensure the overall strength and stability of the mold, both the main mold 2 and the auxiliary mold 3 are divided into left and right halves. The support 1 includes first clamping plates 11 arranged opposite each other on the left and right sides of the main mold 2, and second clamping plates 12 arranged opposite each other on the left and right sides of the auxiliary mold 3. The two first clamping plates 11 are fixedly connected by a crossbeam, and a locking structure 13 is provided between the two second clamping plates 12. The locking structure 13 includes locking arms 131 and locking sleeves 132 respectively provided on the left and right second clamping plates 12. The locking arms 131 and locking sleeves 132 can be inserted together, and the locking arms 131 are provided with locking holes 1311. The locking sleeves 132 are provided with a third locking actuator 133 (such as a cylinder or hydraulic cylinder). The output end of the third locking actuator 133 is provided with a locking head 134 that can be selectively inserted into different locking holes 1311. After the mold is closed, under the action of the third locking actuator 13, the locking head 134 can fit tightly with the locking hole 1311, thereby clamping the sub-mold 3 with the left and right second clamping plates 12. The locking structure 13 plays a role in preventing the sub-mold from inflating when air is blown into it, ensuring the dimensional stability of the product.

[0050] To facilitate precise adjustment of the sub-mold's position and solve the problem of misalignment between the sub-mold and the product, a connecting plate 14 is further provided between the two first clamping plates 11 and the two second clamping plates 12. The connecting plate 14 has multiple longitudinal and transverse strip-shaped assembly holes 141. Both the first clamping plates 11 and the second clamping plates 12 have mounting holes 111 and 121. The strip-shaped assembly holes 141 are fixed to the corresponding mounting holes 111 and 121 on the first clamping plate 11 or the corresponding mounting holes 111 and 121 on the second clamping plate 12 by fasteners.

[0051] The working process of this utility model is as follows:

[0052] The general blow molding process is as follows: First, at the first station, the main mold 2 completes the blow molding of the barrel body; then the blow-molded barrel body is moved to the second station, where the auxiliary mold 3 blows air and cools the barrel again to further solidify it, and automatically removes the upper and lower sprue; finally, it is moved to the third station, where the sprue removal device 4 automatically removes the sprue material from the handle, completing the entire blow molding process.

[0053] As can be seen from the above description of the embodiments, the large barrel blow molding mold of this utility model, through the design of multiple stations, multiple molds and multiple automated sprue cutting settings, realizes the automation and high efficiency of the large barrel blow molding process, significantly reduces labor costs, improves production efficiency, and effectively ensures the quality and dimensional stability of the product.

[0054] The core innovation of this utility model lies in its multi-station integrated design, which highly integrates multiple key processes after the blow molding of the large barrel—blow molding, secondary shaping, automatic removal of the upper and lower sprues, and automatic removal of the handle sprue—into the same mold, realizing the automation and continuity of the production process. This fundamentally subverts the traditional production mode of blow molding molds for large barrels.

[0055] In summary, the innovation of this utility model is reflected in the integration of multiple workstations, high-precision locking mechanism, compact drive design, and adjustable sprue removal. These innovations work together to achieve a comprehensive improvement in the production efficiency, product quality, and automation level of large barrel blow molding.

Claims

1. A blow molding mold for a large barrel, characterized in that: It includes a support (1) and a first station, a second station and a third station arranged sequentially on the support (1). The first station is provided with a main mold (2) for blow molding the bucket. The second station is provided with a secondary mold (3) for removing the upper and lower water inlets of the bucket and for blowing and cooling the bucket again. The third station is provided with a handle water inlet removal device (4) for removing the water inlet at the handle of the bucket.

2. A blow mold for large containers as defined in claim 1, characterized in that: The main mold (2) includes a main mold body (21) and a first lower mold body (22) located below the main mold body (21) and capable of opening and closing relative to it; the main mold body (21) has a first upper cavity (211) and the first lower mold body (22) has a first lower cavity (221), and the first upper cavity (211) and the first lower cavity (221) are connected to form a first blow molding cavity; the upper end of the main mold body (21) is provided with a blow molding port (212), and a demolding drive mechanism (23) for driving the first lower mold body (22) to rise and fall to achieve opening and closing is provided between the first lower mold body (22) and the main mold body (21).

3. The blow molding mold for a large barrel according to claim 1, characterized in that: The sub-mold (3) includes a sub-mold body (31), the upper end of which is detachably connected to a top cover (32), and the lower end of which is provided with a second lower mold (33) that can be raised and lowered; the sub-mold body (31) is provided with a middle cavity (311), the top cover (32) is provided with a second upper cavity (321), and the second lower mold (33) is provided with a second lower cavity (331); the second upper cavity (321), the middle cavity (311), and the second lower cavity (331) are connected to form a second blow molding cavity; A locking mechanism (37) is provided between the upper cover (32), the sub-mold body (31), and the second lower mold (33) to lock the three together; The top cover (32) is provided with a bucket mouth support (322) directly above the bucket mouth. The bucket mouth support (322) is provided with a lifting driver (323). The output end of the lifting driver (323) is provided with a pen that can be inserted into the bucket mouth. The pen is connected to an air pipe for blowing air into the bucket to shape it, and a water pipe for cooling the bucket mouth. The upper side of the sub-mold body (31) is provided with an upper push plate (34) for pushing off the water outlet at the top of the bucket, and a first drive mechanism for driving the upper push plate (34) to move inward and outward. The other side of the upper end of the sub-mold body (31) is provided with a baffle (35) for pushing the sprue material outside the mold, and a second drive mechanism for driving the baffle (35) to move inward and outward. The bottom surface of the second lower mold (33) is provided with a slot (332), and a push plate (36) for breaking the tail material at the bottom of the barrel is provided in the slot (332). The push plate (36) is connected to a push driver (361) for driving the push plate (36) to move laterally.

4. A blow mold for large containers as defined in claim 3, characterized in that: The locking mechanism (37) includes several guide blocks (371) provided on the side of the sub-mold body (31) and guide rods (372) slidably connected to the guide blocks (371). The side of the second lower mold (33) is provided with a fixing block (373). The lower end of the guide rod (372) is connected to the fixing block (373). The fixing block (373) is provided with a first locking driver (374). The output end of the first locking driver (374) is connected to the corresponding guide block (371). The upper end of the guide rod (372) is provided with a bolt seat (375). The bolt seat (375) is provided with a second locking driver (376). The output end of the second locking driver (376) is provided with a bolt head (3761). The side of the upper cover (32) is provided with a locking block (377) at a corresponding position. The bolt head (3761) can extend laterally toward the locking block (377) and pull it down.

5. A blow mold for large containers as defined in claim 3, characterized in that: Both the first drive mechanism and the second driver mechanism are two-stage linear drive structures. The two-stage linear drive structure includes a first-stage support plate (341, 351) on a bracket (1), a first-stage linear driver (342, 352) on the first-stage support plate (341, 351), a second-stage support plate (343, 353) on the output end of the first-stage linear driver (342, 352), and a second-stage linear driver (344, 354) on the second-stage support plate (343, 353). The push plate (34) or baffle (35) is connected to the output end of the corresponding second-stage linear driver (344, 354).

6. A blow mold for large containers as defined in claim 2, characterized in that: The main mold body (21) and the first lower mold body (22) are both provided with a first circulating water channel.

7. A blow molding die for a large barrel according to claim 3, characterized in that: The sub-mold body (31), the upper cover (32), and the second lower mold (33) are all equipped with a second circulating water channel.

8. A blow molding die for a large barrel according to claim 1, characterized in that: The main mold (2) and the sub-mold (3) are both divided into left and right halves. The bracket (1) includes a first clamping plate (11) arranged opposite to the left and right sides of the main mold (2) and a second clamping plate (12) arranged opposite to the left and right sides of the sub-mold (3). The two first clamping plates (11) are fixedly connected by a crossbeam, and a locking structure (13) is provided between the two second clamping plates (12). The locking structure (13) includes a locking arm (131) and a locking sleeve (132) respectively provided on the left and right second clamping plates (12). The locking arm (131) and the locking sleeve (132) are inserted together, and the locking arm (131) is provided with a locking hole (1311). The locking sleeve (132) is provided with a third locking driver (133). The output end of the third locking driver (133) is provided with a locking head (134) that can be selectively inserted into different locking holes (1311).

9. A blow mold for large containers as defined in claim 8, characterized in that: A connecting plate (14) is provided between the two first clamping plates (11) and the two second clamping plates (12). The connecting plate (14) is provided with a plurality of longitudinal and transverse strip-shaped assembly holes (141). The first clamping plates (11) and the second clamping plates (12) are provided with mounting holes (111, 121). The strip-shaped assembly holes (141) and the corresponding mounting holes (111, 121) on the first clamping plate (11) or the corresponding mounting holes (111, 121) on the second clamping plate (12) are fixed by fasteners, so that the main mold (2) and the sub-mold (3) are aligned.

10. A blow mold for large containers as defined in claim 1, characterized in that: The handle sprue removal device (4) includes a clamping frame (41), several jaws (42) provided on the clamping frame (41) and capable of opening and closing for clamping the barrel, a clamping driver (43) for driving the jaws (42) to open and close, and an arc-shaped cutting element (44) for removing the sprue from the handle. The clamping frame (41) is provided with an adjusting frame (45), the middle part of the cutting element (44) is rotatably connected to the adjusting frame (45), the free end of the cutting element (44) is provided with a cutting edge (441), and the other end of the cutting element (44) is connected to a cutting driver (46) for driving its rotation.

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