A thermoforming mold for manufacturing plastic containers with ring-shaped legs.

Abstract

This utility model relates to a thermoforming mold for manufacturing plastic containers with annular support legs, comprising an upper mold and a lower mold; the upper mold includes an upper template and an upper shearing mold; the lower mold includes a lower template, a lower backing plate, a piston, a lower mold body, a forming mold, a lower shearing mold, a lower shearing mold mounting plate, an ejector rod, and a lifting plate; the lower mold also includes an upper limit ring; the lower backing plate has a piston receiving cavity, the piston is installed in the piston receiving cavity and can move up and down in the piston receiving cavity, the outer side of the piston is in sealing contact with the inner side of the piston receiving cavity, the upper limit ring is installed on the top of the lower backing plate and can prevent the piston from moving further upward; the support leg mold is installed on the top of the upper limit ring, the support leg folding and shaping mold is located inside the support leg mold, a first sealing ring is provided between the support leg mold and the upper limit ring, the first sealing ring is in close contact with the outer side of the support leg folding and shaping mold. This utility model simplifies the structure, facilitates processing, and reduces processing costs.

Description

Technical Field

[0001] This utility model relates to thermoforming equipment, and more specifically, to a thermoforming mold for manufacturing plastic containers with annular support legs. Background Technology

[0002] An existing thermoforming mold for manufacturing plastic containers (such as plastic cups, plastic boxes, plastic basins, etc.) can complete the molding and shearing operations. For example, the utility model patent with authorization announcement number CN206254488U discloses a thermoforming mold for manufacturing plastic containers with annular support legs, including an upper mold and a lower mold; the upper mold includes an upper template and an upper shearing mold, the upper shearing mold is installed on the upper template and has a cavity; the lower mold includes a lower template, a lower pad, a cylinder, a piston, a lower mold body, a forming mold, a lower shearing mold, a lower shearing mold mounting plate, an ejector rod, and a lifting plate; the lower pad is installed on the lower template and above the lower template, the lower mold body is detachably installed on the lower pad and above the lower pad, and the lower shearing mold mounting plate is detachably installed on the lower mold body and above the lower mold body; the lower pad has a cylinder receiving cavity, the cylinder is fixedly installed in the cylinder receiving cavity, the piston is installed in the cylinder and can move up and down in the cylinder, the outer side of the piston is in sealed contact with the inner side of the cylinder, and the top of the cylinder is provided with a piston limiting part that can prevent the piston from moving further upward; the forming mold includes a side mold, a support leg mold, a support leg folding and shaping mold, and a movable bottom mold, the side mold... Both the support leg mold and the support leg folding and shaping mold are annular. The support leg mold is installed on the top of the cylinder and above the piston limiting part. The lower end of the support leg folding and shaping mold is integrally connected to the piston and is located inside the support leg mold. The movable bottom mold is located inside the support leg folding and shaping mold and above the piston. The piston has an ejector rod guide hole running vertically, and the ejector rod is located in the ejector rod guide hole. The movable bottom mold is connected to the upper end of the ejector rod, and the lower end of the ejector rod extends to below the lower mold plate. The side mold is installed in the lower mold. The body is stacked on top of the support mold; a sealing ring is provided between the support mold and the piston limiting part, and the sealing ring is in close contact with the outer side of the support folding and shaping mold; the lifting plate is provided with an ejector rod positioning hole, and a positioning guide rod is provided below the ejector rod. The upper end of the positioning guide rod is fixedly connected to the lower end of the ejector rod, and the positioning guide rod is located in the ejector rod positioning hole. The cross-sectional area of ​​the ejector rod is larger than the cross-sectional area of ​​the ejector rod positioning hole; the lower shearing mold is installed on the lower shearing mold mounting plate, and the lower shearing mold is located outside the side mold.

[0003] However, the aforementioned lower mold requires an independent cylinder, with the lower backing plate having a cylinder housing cavity, allowing the piston to be installed in the cylinder and move up and down within it. Furthermore, the top of the cylinder has a piston-limiting part that prevents the piston from moving further upwards; this piston-limiting part is integrally formed with the top of the cylinder. This type of structure has significant drawbacks in actual production: First, it requires an additional independent cylinder, and the outer diameter of the cylinder needs to be precisely machined to fit the cylinder housing cavity of the lower backing plate, while the inner diameter of the cylinder needs to be precisely machined to fit the piston. This results in numerous and time-consuming machining processes, increasing the mold's processing cost. Second, the piston-limiting part and the cylinder are integrally machined, leading to a complex structure that demands high-level machining technology and is difficult to manufacture, further increasing the mold's processing cost. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a thermoforming mold for manufacturing plastic containers with annular support legs. This thermoforming mold for manufacturing plastic containers with annular support legs can simplify the structure, facilitate processing, and reduce processing costs.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows: A thermoforming mold for manufacturing plastic containers with annular support legs includes an upper mold and a lower mold. The upper mold includes an upper template and an upper shearing die, the upper shearing die being mounted on the upper template and having a cavity. The lower mold includes a lower template, a lower backing plate, a piston, a lower mold body, a forming mold, a lower shearing die, a lower shearing die mounting plate, an ejector rod, and a lifting plate. The lower backing plate is mounted on and above the lower template, the lower mold body is detachably mounted on and above the lower backing plate, and the lower shearing die mounting plate is detachable. The mold is installed on and above the lower mold body. The forming mold includes a side mold, a support mold, a support folding and shaping mold, and a movable bottom mold. The side mold, support mold, and support folding and shaping mold are all annular. The lower end of the support folding and shaping mold is integrally connected to the piston. The movable bottom mold is located inside the support folding and shaping mold and above the piston. The piston has an ejector rod guide hole running vertically. The ejector rod is located in the ejector rod guide hole. The movable bottom mold is connected to the upper end of the ejector rod, and the lower end of the ejector rod extends into the lower mold. Below the plate, the side mold is installed on the lower mold body and stacked above the support mold; the lifting plate is provided with an ejector rod positioning hole, and a positioning guide rod is provided below the ejector rod. The upper end of the positioning guide rod is fixedly connected to the lower end of the ejector rod, and the positioning guide rod is located in the ejector rod positioning hole. The cross-sectional area of ​​the ejector rod is larger than the cross-sectional area of ​​the ejector rod positioning hole; the lower shear mold is installed on the lower shear mold mounting plate and is located outside the side mold; the lower mold further includes an upper limit ring; the lower pad plate has a piston receiving cavity, the piston is installed in the piston receiving cavity and can move up and down in the piston receiving cavity, the outer side of the piston is in sealing contact with the inner side of the piston receiving cavity, the upper limit ring is installed on the top of the lower pad plate and can prevent the piston from moving upward; the support mold is installed on the top of the upper limit ring, the support folding and shaping mold is located inside the support mold, and a first sealing ring is provided between the support mold and the upper limit ring. The first sealing ring is in close contact with the outer side of the support folding and shaping mold.

[0006] In the above-mentioned thermoforming mold, the side mold is used to form the side wall and edge of the plastic container, the movable bottom mold is used to form the bottom of the plastic container, and the support mold and the support folding and shaping mold are used together to form the ring support.

[0007] The aforementioned upper limit ring is installed on top of the lower pad and remains in a stable position, and the support leg mold is installed on top of the upper limit ring and remains in a stable position.

[0008] The forming process of the above thermoforming mold is as follows: First, the piston descends to its lowest position, and the support leg folding mold and the movable bottom mold also descend to their lowest positions. At this time, the inner surface of the side mold, the inner side of the support leg mold, the upper end face of the support leg folding mold, and the upper surface of the movable bottom mold together form a molding cavity. Under the action of compressed air, the plastic sheet adheres tightly to the inner wall of the molding cavity, so that the plastic sheet completes the initial molding and obtains the container blank. The first sealing ring is located between the support leg mold and the upper limit ring. The first sealing ring is tightly fitted with the outer side of the support leg folding mold to achieve dynamic sealing and isolate the air passage between the molding cavity and the piston accommodating cavity.

[0009] Subsequently, the piston rises, causing the support leg folding and shaping mold and the movable bottom mold to rise together (at this time, the lower end of the ejector rod disengages from the upper surface of the lifting plate). The bottom of the container blank is lifted to the predetermined position. At the same time, under the action of the support leg folding and shaping mold, the part of the container blank that is attached to the inner side of the support leg mold folds upward. When the piston rises to the upper limit position, the top surface of the piston directly abuts against the lower end surface of the upper limit ring, which blocks the piston from continuing to rise, precisely limiting the upward stroke of the piston. At this time, the support leg mold and the support leg folding and shaping mold together clamp the folded part to make it stick together, forming an annular support leg, completing the shaping of the plastic container. Throughout the upward process, the first sealing ring always maintains a sealed contact with the outer side of the support leg folding and shaping mold, which not only ensures the stability of the air pressure drive of the piston accommodating cavity, but also prevents the leakage of molding gas from affecting the shaping effect of the support leg.

[0010] Next, the lower shearing die and the upper shearing die work together to cut the formed sheet, cutting the shaped plastic container out of the formed sheet to obtain a single plastic container; then, the piston and support legs fold down the forming die to the low position, and the lifting plate rises and drives the ejector rod and the movable bottom mold to rise (at this time, the lower end of the ejector rod contacts the upper surface of the lifting plate), ejecting the plastic container.

[0011] In the preferred embodiment, a second sealing ring is installed on the outer surface of the piston, and the second sealing ring is in close contact with the inner surface of the piston accommodating cavity. The piston divides the piston accommodating cavity into an upper air chamber and a lower air chamber through the second sealing ring. An upper air inlet / outlet channel is provided on the lower pad, which communicates with the upper air chamber. A lower air inlet / outlet channel is provided on the lower template, which communicates with the lower air chamber. A piston guide rod running vertically is integrally connected to the bottom of the piston. A piston guide hole running vertically is provided in the lower template, and the piston guide rod is located in the piston guide hole. The lower end of the piston guide rod extends to the bottom of the lower template. The ejector rod guide hole extends to the lower end of the piston guide rod. A third sealing ring is installed on the inner surface of the piston guide hole, and the third sealing ring is in close contact with the outer surface of the piston guide rod. The piston guide hole in the lower template serves a guiding function, and the third sealing ring serves a sealing function, ensuring the sealing of the lower end of the piston accommodating cavity and cooperating with the piston guide rod to guide the piston to rise and fall smoothly.

[0012] In a preferred embodiment, the upper part of the inner side surface of the support leg mold gradually slopes outward from top to bottom, the lower part of the inner side surface of the support leg mold gradually slopes inward from top to bottom, and the outer side surface of the top of the support leg folding and shaping mold gradually slopes outward from top to bottom. This makes the forming process of the annular support leg more stable and reliable. The outer side surface of the top of the support leg folding and shaping mold matches the upper part of the inner side surface of the support leg mold in shape, but its size is slightly smaller than that of the upper part of the inner side surface of the support leg mold.

[0013] In a further preferred embodiment, a fourth sealing ring is installed on the outer surface of the support mold, and the fourth sealing ring is in close contact with the inner surface of the upper part of the upper limit ring. The fourth sealing ring is positioned between the assembly gap between the outer surface of the support mold and the inner surface of the upper limit ring to provide a sealing function.

[0014] In a preferred embodiment, the top surface of the lower pad is provided with an annular limiting step, which surrounds the outer side of the upper opening of the piston accommodating cavity. The outer edge of the lower part of the upper limiting ring is mounted on the annular limiting step, and a fifth sealing ring is installed on the outer surface of the outer edge of the lower part of the upper limiting ring, making tight contact with the surface of the annular limiting step. The annular limiting step limits the upper limiting ring, ensuring its stable position. The fifth sealing ring provides a seal, preventing air leakage at the mating point between the upper limiting ring and the annular limiting step.

[0015] In a preferred embodiment, a first buffer pad made of nylon is provided on the upper surface of the piston. The first buffer pad is used to reduce the impact force on the piston when the movable bottom mold descends.

[0016] In a preferred embodiment, a second buffer pad made of nylon is provided on the upper surface of the lower template. The second buffer pad is located directly below the piston and is used to reduce the impact force on the lower template when the piston descends.

[0017] Generally, the other structures of the aforementioned thermoforming mold are the same as those disclosed in the utility model patent with authorization announcement number CN206254488U, which discloses a thermoforming mold structure for manufacturing plastic containers with annular support legs, so they will not be described in detail here.

[0018] Compared with the prior art, this utility model has the following advantages: (1) This utility model abandons the independent cylinder component in the prior art and directly processes the piston receiving cavity inside the lower pad as the piston's moving cavity. The piston directly cooperates with the inner wall of the piston receiving cavity for sealing, which simplifies the structure, facilitates processing, and reduces processing costs.

[0019] (2) This utility model uses an independently processed upper limit ring, which eliminates the need to process the limit structure on the cylinder as a whole, making the processing technology simpler and helping to reduce processing costs. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of a preferred embodiment of the present invention; Figure 2 yes Figure 1 A schematic diagram of the structure of the lower pad, piston, support mold, support folding and shaping mold, and upper limit ring; Figure 3 yes Figure 1 Enlarged view of the middle and lower mold. Detailed Implementation

[0021] The following description, in conjunction with the accompanying drawings and preferred embodiments of the present invention, will provide further details.

[0022] like Figure 1-3As shown, this thermoforming mold for manufacturing plastic containers with annular legs includes an upper mold 1 and a lower mold 2. The upper mold 1 includes an upper template 11 and an upper shearing die 12, which is mounted on the upper template 11 and has a cavity 13. The lower mold 2 includes a lower template 21, a lower pad 22, a piston 23, a lower mold body 24, a forming mold 25, a lower shearing die 26, a lower shearing die mounting plate 27, an ejector rod 28, a lifting plate 29, and an upper limit ring 20. The lower pad 22 is mounted on and above the lower template 21, and the lower mold body 24 is detachably mounted on and above the lower pad 22. The lower shearing die mounting plate 27 is detachably mounted on the lower die body 24 and positioned above the lower die body 24; the forming die 25 includes a side die 251, a support die 252, a support folding and shaping die 253, and a movable bottom die 254. The side die 251, the support die 252, and the support folding and shaping die 253 are all annular. The lower end of the support folding and shaping die 253 is integrally connected to the piston 23. The movable bottom die 254 is located inside the support folding and shaping die 253 and above the piston 23. The piston 23 has an ejector rod guide hole 231 running vertically. The ejector rod 28 is located in the ejector rod guide hole 231. The movable bottom die 254 and the ejector rod... The upper end of the ejector rod 28 is connected, and the lower end of the ejector rod 28 extends below the lower template 21. The side mold 251 is installed on the lower mold body 24 and stacked above the support mold 252. The lifting plate 29 is provided with an ejector rod positioning hole 291, and a positioning guide rod 281 is provided below the ejector rod 28. The upper end of the positioning guide rod 281 is fixedly connected to the lower end of the ejector rod 28. The positioning guide rod 281 is located in the ejector rod positioning hole 291, and the cross-sectional area of ​​the ejector rod 28 is larger than the cross-sectional area of ​​the ejector rod positioning hole 291. The lower shearing mold 26 is installed on the lower shearing mold mounting plate 27, and the lower shearing mold 26 is located outside the side mold 251. The lower pad Plate 22 has a piston receiving cavity 221, the piston 23 is installed in the piston receiving cavity 221 and can move up and down in the piston receiving cavity 221, the outer side of the piston 23 is in sealing contact with the inner side of the piston receiving cavity 221, the upper limit ring 20 is installed on the top of the lower pad plate 22 and can prevent the piston 23 from moving upward; the support mold 252 is installed on the top of the upper limit ring 20, the support folding and shaping mold 253 is located inside the support mold 252, a first sealing ring 3 is provided between the support mold 252 and the upper limit ring 20, and the first sealing ring 3 is in close contact with the outer side of the support folding and shaping mold 253.

[0023] Of the 25 thermoforming molds mentioned above, the side mold 251 is used to form the side walls and edges of the plastic container, the movable bottom mold 254 is used to form the bottom of the plastic container, and the support mold 252 and the support folding and shaping mold 253 are used together to form the annular support.

[0024] The aforementioned upper limit ring 20 is installed on the top of the lower pad 22 and remains in a stable position, and the support mold 252 is installed on the top of the upper limit ring 20 and remains in a stable position.

[0025] The forming process of the above 25 thermoforming molds is as follows: First, the piston 23 descends to its low position, and the support leg folding and shaping mold 253 and the movable bottom mold 254 also descend to their low positions. At this time, the inner surface of the side mold 251, the inner side surface of the support leg mold 252, the upper end surface of the support leg folding and shaping mold 253, and the upper surface of the movable bottom mold 254 together form the forming mold cavity 25. Under the action of compressed air, the plastic sheet adheres tightly to the inner wall of the forming mold cavity 25, so that the plastic sheet completes the initial forming and obtains the container blank. The first sealing ring 3 is located between the support leg mold 252 and the upper limit ring 20. The first sealing ring 3 is tightly fitted with the outer side surface of the support leg folding and shaping mold 253 to achieve dynamic sealing and isolate the air passage between the forming mold cavity 25 and the piston accommodating cavity 221.

[0026] Subsequently, piston 23 rises, driving the support leg folding and shaping mold 253 and movable bottom mold 254 to rise together (at this time, the lower end of ejector rod 28 disengages from the upper surface of lifting plate 29), and the bottom of container blank is lifted to the predetermined position. At the same time, under the action of support leg folding and shaping mold 253, the part of container blank attached to the inner side of support leg mold 252 is folded upward. When piston 23 moves to the upper limit position, the top surface of piston 23 directly abuts against the lower end surface of upper limit ring 20, and the upper limit ring 20 blocks piston 23 from continuing to move upward, precisely limiting the upward stroke of piston 23. At this time, support leg mold 252 and support leg folding and shaping mold 253 jointly clamp the folded part to make it stick together, forming an annular support leg, completing the shaping of plastic container. Throughout the upward process, the first sealing ring 3 always maintains sealed contact with the outer side of support leg folding and shaping mold 253, which not only ensures the stability of the air pressure drive of piston accommodating cavity 221, but also prevents the leakage of molding gas from affecting the shaping effect of support leg.

[0027] Next, the lower shearing die 26 cooperates with the upper shearing die 12 to cut the formed sheet, cutting the shaped plastic container out of the formed sheet to obtain a single plastic container; then, the piston 23 and the support leg folding shaping die 253 descend to the low position, and the lifting plate 29 rises and drives the ejector rod 28 and the movable bottom die 254 to rise (at this time, the lower end of the ejector rod 28 contacts the upper surface of the lifting plate 29), ejecting the plastic container.

[0028] A second sealing ring 4 is installed on the outer surface of the piston 23. The second sealing ring 4 is in close contact with the inner surface of the piston receiving cavity 221. The piston 23 divides the piston receiving cavity 221 into an upper air chamber 2211 and a lower air chamber 2212 through the second sealing ring 4. The lower pad 22 is provided with an upper air inlet / outlet channel 222, which communicates with the upper air chamber 2211. The lower template 21 is provided with a lower air inlet / outlet channel 211, which communicates with the lower air chamber 2212. A piston guide rod 232 running vertically is integrally connected to the bottom of piston 23. A piston guide hole 212 running vertically is provided in the lower template 21. The piston guide rod 232 is located in the piston guide hole 212, with its lower end extending below the lower template 21. The ejector rod guide hole 231 extends to the lower end of the piston guide rod 232. A third sealing ring 5 is installed on the inner side of the piston guide hole 212, and the third sealing ring 5 is in close contact with the outer side of the piston guide rod 232. The piston guide hole 212 in the lower template 21 serves a guiding function, and the third sealing ring 5 serves a sealing function, ensuring the sealing of the lower end of the piston receiving cavity 221 and cooperating with the piston guide rod 232 to guide the piston 23 to rise and fall smoothly.

[0029] The upper part of the inner side of the support leg mold 252 gradually slopes outward from top to bottom, and the lower part of the inner side of the support leg mold 252 gradually slopes inward from top to bottom. The outer side of the top of the support leg folding and shaping mold 253 gradually slopes outward from top to bottom. This makes the forming process of the annular support leg more stable and reliable. The outer side of the top of the support leg folding and shaping mold 253 matches the shape of the upper part of the inner side of the support leg mold 252, but its size is slightly smaller than that of the upper part of the inner side of the support leg mold 252.

[0030] A fourth sealing ring 6 is installed on the outer surface of the support mold 252, and the fourth sealing ring 6 is in close contact with the inner surface of the upper part of the upper limit ring 20. The fourth sealing ring 6 is placed between the assembly gap between the outer surface of the support mold 252 and the inner surface of the upper part of the upper limit ring 20 to achieve a sealing function.

[0031] An annular limiting step 223 is provided on the top surface of the lower pad 22. The annular limiting step 223 surrounds the outer side of the upper opening of the piston receiving cavity 221. The lower outer edge of the upper limiting ring 20 is mounted on the annular limiting step 223. A fifth sealing ring 7 is installed on the outer surface of the lower outer edge of the upper limiting ring 20, and the fifth sealing ring 7 is in close contact with the surface of the annular limiting step 223. The annular limiting step 223 limits the upper limiting ring 20, enabling the upper limiting ring 20 to maintain a stable position. The fifth sealing ring 7 provides a seal, preventing air leakage at the mating point between the upper limiting ring 20 and the annular limiting step 223.

[0032] The upper surface of the piston 23 is provided with a first buffer pad 8 made of nylon, which is used to reduce the impact force on the piston 23 when the movable bottom mold 254 descends.

[0033] A second buffer pad 9 made of nylon is provided on the upper surface of the lower template 21. The second buffer pad 9 is located directly below the piston 23. The second buffer pad 9 is used to reduce the impact force on the lower template 21 when the piston 23 descends.

[0034] Furthermore, it should be noted that the names of the various parts of the specific embodiments described in this specification may differ. All equivalent or simple variations made to the structure, features, and principles described in this utility model patent concept are included within the protection scope of this utility model patent. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to replace them, as long as they do not deviate from the structure of this utility model or exceed the scope defined in these claims, they should all fall within the protection scope of this utility model.

Claims

1. A thermoforming mold for manufacturing a plastic container with annular legs, comprising an upper mold and a lower mold; the upper mold includes an upper template and an upper shearing mold, the upper shearing mold being mounted on the upper template and having a cavity; the lower mold includes a lower template, a lower backing plate, a piston, a lower mold body, a forming mold, a lower shearing mold, a lower shearing mold mounting plate, an ejector rod, and a lifting plate; the lower backing plate is mounted on and above the lower template, the lower mold body is detachably mounted on and above the lower backing plate, and the lower shearing mold mounting plate is detachably mounted on and above the lower mold body; the forming mold includes a side mold, a leg mold, a leg folding and shaping mold, and a movable bottom mold, wherein the side mold, the leg mold, and the leg folding and shaping mold are all annular, and the lower part of the leg folding and shaping mold is... The end is integrally connected to the piston. The movable bottom mold is located inside the folding and shaping mold of the support leg and above the piston. The piston has an ejector rod guide hole running vertically. The ejector rod is located in the ejector rod guide hole. The movable bottom mold is connected to the upper end of the ejector rod. The lower end of the ejector rod extends to below the lower mold plate. The side mold is installed on the lower mold body and stacked on top of the support leg mold. The lifting plate has an ejector rod positioning hole. A positioning guide rod is provided below the ejector rod. The upper end of the positioning guide rod is fixedly connected to the lower end of the ejector rod. The positioning guide rod is located in the ejector rod positioning hole. The cross-sectional area of ​​the ejector rod is larger than the cross-sectional area of ​​the ejector rod positioning hole. The lower shearing mold is installed on the lower shearing mold mounting plate and is located outside the side mold. Its characteristics are: The lower mold further includes an upper limit ring; the lower pad has a piston receiving cavity, the piston is installed in the piston receiving cavity and can move up and down in the piston receiving cavity, the outer side of the piston is in sealing contact with the inner side of the piston receiving cavity, the upper limit ring is installed on the top of the lower pad and can prevent the piston from moving upward; the support mold is installed on the top of the upper limit ring, the support folding and shaping mold is located inside the support mold, a first sealing ring is provided between the support mold and the upper limit ring, and the first sealing ring is in close contact with the outer side of the support folding and shaping mold.

2. The thermoforming mold for manufacturing a plastic container with annular support legs as described in claim 1, characterized in that: A second sealing ring is installed on the outer surface of the piston, and the second sealing ring is in close contact with the inner surface of the piston cavity. The piston divides the piston cavity into an upper air chamber and a lower air chamber through the second sealing ring. An upper air inlet and outlet channel is provided on the lower pad, which is connected to the upper air chamber. A lower air inlet and outlet channel is provided on the lower template, which is connected to the lower air chamber. A piston guide rod running vertically is integrally connected to the bottom of the piston. A piston guide hole running vertically is provided in the lower template. The piston guide rod is located in the piston guide hole, and the lower end of the piston guide rod extends to the bottom of the lower template. The ejector rod guide hole extends to the lower end of the piston guide rod. A third sealing ring is installed on the inner surface of the piston guide hole, and the third sealing ring is in close contact with the outer surface of the piston guide rod.

3. The thermoforming mold for manufacturing a plastic container with annular support legs as described in claim 1, characterized in that: The upper part of the inner side of the support mold gradually slopes outward from top to bottom, the lower part of the inner side of the support mold gradually slopes inward from top to bottom, and the outer side of the top of the support folding and shaping mold gradually slopes outward from top to bottom.

4. The thermoforming mold for manufacturing a plastic container with annular support legs as described in claim 3, characterized in that: A fourth sealing ring is installed on the outer side of the support mold, and the fourth sealing ring is in close contact with the inner side of the upper part of the upper limit ring.

5. The thermoforming mold for manufacturing a plastic container with annular support legs as described in claim 1, characterized in that: The top surface of the lower pad is provided with an annular limiting step, which surrounds the outer side of the upper opening of the piston accommodating cavity. The outer edge of the lower part of the upper limit ring is installed on the annular limiting step, and a fifth sealing ring is installed on the outer side of the lower part of the upper limit ring. The fifth sealing ring is in close contact with the surface of the annular limiting step.

6. The thermoforming mold for manufacturing a plastic container with annular support legs as described in claim 1, characterized in that: The piston has a first cushioning pad made of nylon on its upper surface.

7. The thermoforming mold for manufacturing a plastic container with annular support legs as described in claim 1, characterized in that: The upper surface of the lower template is provided with a second buffer pad made of nylon, which is located directly below the piston.

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