A carton folding and hemming forming die

Abstract

The present application relates to a kind of carton folding hemming forming die, including upper die and lower die, upper die includes upper die seat, upper die body and forming head, upper die body is installed on upper die seat;Lower die includes lower die seat, lower die body, bottom support and hemming plate, lower die body is installed on lower die seat;Upper die body lower part is equipped with upper die cavity, forming head is installed in upper die cavity by first elastic member;The upper surface of lower die body is equipped with first boss, the inside of first boss is equipped with forming cavity, lower die cavity is arranged in lower die body, lower die cavity is below forming cavity and is communicated with forming cavity, the lower part of forming head is matched with forming cavity, bottom support is installed in lower die cavity by second elastic member;When upper die and lower die are in open mould state, the upper surface of bottom support is higher than the upper surface of hemming plate, the upper surface of hemming plate is higher than the upper end opening edge of forming cavity.This carton folding hemming forming die can be folded and hemmed to carton once, save time and effort, improve the folding hemming efficiency of carton.

Description

Technical Field

[0001] This invention relates to a paper box forming mold, and more particularly to a paper box folding and edge-rolling forming mold. Background Technology

[0002] Paper packaging boxes are containers used to hold goods. Currently, paper packaging boxes are generally automatically folded using a box-folding machine. For example, CN205202318U discloses a box-folding machine, including a worktable and a support on the worktable. A pressing mold is provided on the worktable, the pressing mold including a bottom mold fixed to the worktable, a pressure cover connected to a piston rod of a power cylinder on the support and located above the bottom mold, and folding components movably disposed on the worktable and located in front of, behind, to the left and right of the bottom mold. The cardboard for the packaging box can be easily placed on the bottom mold. After the pressure cover is pressed down by the power cylinder above it, the four sides of the cardboard are folded downwards. Then, by moving the opposing front and rear or left and right folding components, the folded corners of the cardboard are folded to the corresponding sides, thus completing the box-folding operation. However, this type of folding machine only folds cardboard into semi-finished boxes through multiple steps, without involving the folding and rolling of the box opening edges. The semi-finished boxes need to be transported to other folding mechanisms for folding, and then the folded semi-finished boxes need to be moved to the next station for heating and rolling. The subsequent folding and rolling operations are cumbersome, inefficient, and require a lot of time to transport the semi-finished boxes. Furthermore, a second heating process is required for rolling, resulting in high energy consumption. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a paper box folding and rolling forming mold that can fold and roll the edges of the paper box in one operation, saving time and effort and improving the folding and rolling efficiency of the paper box.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows:

[0005] A paper box folding and edge-rolling forming mold includes an upper mold and a lower mold, and a mold-closing drive mechanism capable of driving the upper and lower molds to open and close. The upper mold includes an upper mold base, an upper mold body, and a forming head. The upper mold body is mounted on the upper mold base and has an upper heating tube inside. The lower mold includes a lower mold base, a lower mold body, and a base support. The lower mold body is mounted on the lower mold base and has a lower heating tube inside. The upper mold body has a downward-opening upper mold cavity at its lower part. The forming head is mounted in the upper mold cavity via a first elastic element, and the depth of the upper mold cavity is the same as the upper height of the forming head. The upper surface of the lower mold body has an upward-protruding first boss, and the interior of the first boss has an upward-opening forming cavity. The lower mold body has a lower mold cavity inside, which is located below and communicates with the forming cavity. The lower part of the forming head matches the forming cavity. The base support is mounted in the lower mold cavity via a second elastic element. The lower mold also includes a rolling... The edge plate and the rolled edge plate have a guide hole at their center corresponding to the first boss. The rolled edge plate is fitted onto the first boss through the guide hole and is mounted on the lower mold body through a third elastic element. The height of the rolled edge plate is greater than the height of the first boss. The upper part of the forming head matches the guide hole. The upper opening edge of the guide hole has an upward-facing lower annular rolled edge groove, and the lower opening edge of the upper mold cavity has a downward-facing upper annular rolled edge groove. The upper annular rolled edge groove and the lower annular rolled edge groove are correspondingly engaged. When the upper mold and the lower mold are in the open mold state, the upper surface of the base is higher than the upper surface of the rolled edge plate, and the upper surface of the rolled edge plate is higher than the upper opening edge of the forming cavity. When the upper mold and the lower mold are in the mold closing process, there is an annular gap between the upper part of the forming head and the inner wall of the guide hole, which allows the cardboard to pass through. The lower end face of the upper mold body is in contact with the upper surface of the rolled edge plate, and the annular gap is connected to the upper annular rolled edge groove.

[0006] The forming head is mounted in the upper mold cavity via a first elastic element, connecting the forming head to the upper mold cavity and allowing it to extend and retract vertically within the upper mold cavity. The bottom support is mounted in the lower mold cavity via a second elastic element, connecting the bottom support to the lower mold cavity and allowing it to extend and retract vertically within both the lower mold cavity and the forming cavity. The rolled edge plate is mounted on the lower mold body via a third elastic element, connecting the rolled edge plate to the lower mold body and allowing it to extend and retract vertically along the outer wall of the first boss.

[0007] The working process of the above-mentioned cardboard box folding and edge-rolling forming mold is as follows: First, the upper mold body is heated by the upper heating pipe, and the lower mold body is heated by the lower heating pipe; then, the cut cardboard (both the inner and outer surfaces of the cardboard are coated with a waterproof adhesive layer) is conveyed to the upper surface of the bottom tray. The upper mold is driven by the mold closing drive mechanism to start pressing down, causing the lower surface of the forming head to descend and gradually clamp the cardboard sheet when it contacts the upper surface of the bottom tray. The upper mold body continues to move downward, and the bottom tray retracts into the forming cavity, so that the four sides of the cardboard contact the upper surface of the edge-rolling plate (i.e., the upper opening edge of the guide through hole). The four sides of the cardboard will fold inward to form a semi-finished cardboard box. At this time, the lower part of the forming head is not yet in the forming cavity, and the lower end face of the upper mold body has not yet contacted the upper surface of the edge-rolling plate. The opening edge of the semi-finished cardboard box will naturally move towards the outer wall of the forming head and insert into the upper annular edge-rolling groove. Then, the upper mold body continues to move downward until the forming head completely presses the bottom support back into the lower mold cavity. The lower part of the forming head is in the forming cavity. Under the obstruction of the lower mold cavity, the bottom support cannot move downward in the lower mold cavity, and the forming head cannot move downward in the forming cavity either, so that the upper surface of the bottom support... The surface and the inner wall of the forming cavity form a box-shaped body. The semi-finished paper box is completely held in the box-shaped body by the forming head and the bottom support. Under the heating of the upper and lower molds, the four corners of the semi-finished paper box are thermoformed by sticking together. At this time, the upper part of the four sides of the semi-finished paper box is in the annular gap. The lower end face of the upper mold and the upper surface of the edge-rolling plate begin to contact. The lower annular edge-rolling groove of the edge-rolling plate and the upper annular edge-rolling groove of the upper mold correspond to each other to form an annular edge-rolling groove with the opening facing downward. Then, because the height of the edge-rolling plate is greater than the height of the first boss, the annular gap and the annular edge-rolling groove are connected. Since the fully clamped semi-finished cardboard box has no downward movement space in the forming cavity, under the action of the first elastic element, the upper mold body continues to move downward, causing the edge-rolling plate to move downward along the outer wall of the first boss. The length of the four sides of the semi-finished cardboard box in the annular gap gradually shortens, and the opening edge of the semi-finished cardboard box gradually inserts upward into the annular edge-rolling groove under the guidance of the annular edge-rolling groove, so that the opening edge of the semi-finished cardboard box gradually bends outward to perform the edge-rolling operation; finally, the upper mold is driven to rise upward by the mold closing drive mechanism, so that the edge-rolled cardboard box is demolded to obtain the finished cardboard box.

[0008] In a preferred embodiment, the elastic force of the first elastic element is greater than that of the second elastic element, and the elastic force of the third elastic element is greater than that of the second elastic element. Designing the elastic forces of the first and third elastic elements to be relatively large provides sufficient pressure and support, ensuring stable positioning and fixation of the forming head, base, and edge-rolling plate, guaranteeing the stability of the mold during operation and forming. It also allows for a certain pressure fit with the forming head, edge-rolling plate, and other components, providing appropriate pressure and deformation to the semi-finished cardboard box during edge-rolling, thereby achieving accurate edge-rolling and ensuring proper support and positioning of the semi-finished cardboard box during forming. Typically, the elastic force of the first elastic element is greater than that of the third elastic element.

[0009] In a preferred embodiment, the first elastic element includes a first guide rod, a first compression spring, and a first limiting block. The upper mold body has a first guide hole communicating with the upper mold cavity. The first guide rod passes through the first guide hole, and its lower end connects to the upper surface of the forming head. The first limiting block is installed on the upper end of the first guide rod and engages with the upper opening edge of the first guide hole. The first compression spring is fitted onto the first guide rod, with its upper end contacting the bottom of the upper mold cavity and its lower end contacting the upper surface of the forming head. When the upper and lower molds are in the closed state, neither the forming head nor the base can move downwards. At this time, the upper mold body continues to move downwards along the forming head, compressing the first compression spring and causing the lower end of the upper mold body to move downwards and contact the upper surface of the rolled edge plate. When the upper and lower molds are in the open state, the first compression spring returns to its original length, allowing the upper mold body to move upward along the first guide rod. However, the first limiting block restricts the first compression spring from further lengthening, preventing the upper mold body from moving upward further. In a more preferred embodiment, the first guide hole is a countersunk hole.

[0010] In a further preferred embodiment, the upper surface of the forming head is provided with a first limiting hole corresponding to the first guide hole, and the lower end of the first compression spring is located in the first limiting hole. This arrangement limits the lower end of the first compression spring within the first limiting hole, making the first compression spring more stable during extension and retraction.

[0011] In a further preferred embodiment, the third elastic element includes a first cylinder, a third guide rod, a third limiting block, and a third compression spring. The interior of the rolled edge plate is provided with a third guide hole that runs vertically through it. The lower mold body is provided with a fourth guide hole corresponding to the third guide hole. The first cylinder is mounted on the lower mold base, with the piston rod of the first cylinder extending upwards. The third guide rod is located in both the fourth and third guide holes. The third limiting block is mounted on the upper end of the third guide rod and engages with the upper opening edge of the third guide hole. The lower end of the third guide rod is connected to the end of the piston rod of the first cylinder. The third compression spring is fitted onto the third guide rod, with its upper end contacting the lower surface of the rolled edge plate and its lower end contacting the upper surface of the lower mold body. After the edge curling is completed, the upper mold is lifted upward by the mold closing drive mechanism. Since the forming head will continue to be pulled downward under the reset action of the first compression spring, if the roll plate moves upward at this time due to its ability to extend and retract, the curled edge of the semi-finished carton opening will loosen. At this time, the first cylinder of the lower mold body retracts, pulling the third guide rod, so that the third compression spring on the third guide rod does not rebound and reset temporarily, thus pulling the edge curling plate to prevent it from moving upward. When the upper mold is fully opened, the bottom support extends upward under the reset action of the second elastic element and is above the forming cavity, so that the finished carton is pushed upward. After the finished carton is pushed out, the first cylinder of the lower mold body extends, releasing the third guide rod and the edge curling plate connected to it, allowing the edge curling plate to return to its original position under the reset action of the third compression spring.

[0012] In another preferred embodiment, a second cylinder is provided inside the upper mold body. The piston rod of the second cylinder extends downwards. A fifth guide hole communicating with the upper mold cavity is provided inside the upper mold body. The piston rod of the second cylinder passes through the fifth guide hole, with its end positioned within the upper mold cavity. The upper surface of the forming head is connected to the end of the piston rod of the second cylinder. The forming head has an air passage connected to an external adsorption device inside, and multiple suction holes communicating with the air passage are provided on the lower surface of the forming head. This configuration allows the forming head to extend and retract vertically within the upper mold cavity. When the upper and lower molds open, the external adsorption device is activated to evacuate the air passage of the forming head, creating a negative pressure zone at each suction hole. The forming head then adsorbs the already rolled cardboard box. The second cylinder then retracts upwards, causing the forming head and the adsorbed cardboard box to move upwards, preventing the rolled edge of the semi-finished cardboard box from loosening due to upward movement of the roll plate.

[0013] In a further preferred embodiment, the third elastic element includes a third guide rod, a third limiting block, and a third compression spring. The rolled edge plate has a through-hole, with the third guide rod positioned within it. The third limiting block is mounted on the upper end of the third guide rod and engages with the upper opening edge of the third guide hole. The lower end of the third guide rod connects to the upper surface of the lower mold body. The third compression spring is fitted onto the third guide rod, with its upper end contacting the lower surface of the rolled edge plate and its lower end contacting the upper surface of the lower mold body. When the upper and lower molds are in the closed state, neither the forming head nor the base can move downwards. At this time, the upper mold body continues to move downwards along the forming head, compressing the third compression spring and causing the rolled edge plate to move downwards along the outer wall of the first boss. When the upper and lower molds are in the open state, the third compression spring returns to its original length, allowing the rolled edge plate to move upwards along the outer wall of the first boss. However, the limiting action of the third limiting block prevents the third compression spring from further lengthening, thus preventing the rolled edge plate from moving upwards. In a better embodiment, the third guide hole is a countersunk hole.

[0014] In a further preferred embodiment, the upper surface of the lower mold body is provided with a third limiting hole corresponding to the third guide hole, and the lower end of the third compression spring is located in the third limiting hole. This arrangement limits the lower end of the third compression spring within the third limiting hole, making the third compression spring more stable during extension and contraction.

[0015] In a preferred embodiment, the second elastic element includes a second guide rod, a second compression spring, and a second limiting block. The lower mold body has a second guide hole communicating with the lower mold cavity. The second guide rod passes through the second guide hole, and its upper end connects to the lower surface of the base. The second limiting block is installed at the lower end of the second guide rod, and it engages with the lower opening edge of the second guide hole. The second compression spring is fitted onto the second guide rod, with its upper end contacting the upper surface of the base and its lower end contacting the bottom of the lower mold cavity. During the mold closing process between the upper and lower molds, when neither the forming head nor the base can move downwards, the second compression spring is compressed within the lower mold cavity. The second guide rod moves downwards along the second guide hole, causing the base to move downwards until it is blocked by the lower mold cavity and can no longer move downwards. During the mold opening process between the upper and lower molds, the second compression spring returns to its original length, causing the second guide rod to move upward along the second guide hole, thus driving the base to move upward. However, under the limiting action of the second limiting block, the second compression spring is prevented from continuing to lengthen, thus preventing the base from moving upward further. In a more preferred embodiment, the second guide hole is a countersunk hole.

[0016] In a preferred embodiment, the lower mold body is provided with two opposing stop blocks, both of which are located outside the edge-rolling plate. When the upper and lower molds are in the open state, the upper surface of the stop blocks is higher than the upper surface of the edge-rolling plate. To solve the problem of the folding sequence of the cardboard box, when two opposite edges of the cardboard contact the two opposing stop blocks, the two opposite edges of the cardboard fold inward first. Then, as the upper mold body continues to move downward, the bottom support retracts into the lower mold cavity, causing the other two opposite edges of the cardboard to contact the upper surface of the edge-rolling plate (i.e., the upper opening edge of the guide hole). The other two opposite edges of the cardboard will then naturally fold inward as well.

[0017] In a preferred embodiment, the edge-rolling plate is equipped with an edge-rolling heating tube. By heating the edge-rolling plate with the edge-rolling heating tube, as the opening edge of the semi-finished paper box gradually inserts upward into the annular edge-rolling groove, the heating of the edge-rolling plate can further accelerate the gradual outward bending of the opening edge of the semi-finished paper box.

[0018] In a preferred embodiment, the cross-sectional area of ​​the lower part of the molding head gradually decreases from top to bottom, and the cross-sectional area of ​​the molding cavity also gradually decreases from top to bottom. This arrangement ensures that when the lower part of the molding head is within the molding cavity, the lower part of the molding head matches the molding cavity.

[0019] In a preferred embodiment, the upper surface of the base is provided with an upwardly protruding second boss, and the lower surface of the forming head is provided with a downwardly opening molding groove, which corresponds to and cooperates with the second boss; when the upper mold and the lower mold are in the closed mold state, the second boss is in the molding groove.

[0020] Typically, the upper mold base is connected to the power output end of the mold closing drive mechanism. The mold closing drive mechanism can be a cylinder, a hydraulic cylinder, or a structure that combines a motor and a transmission linkage.

[0021] Compared with the prior art, the present invention has the following advantages:

[0022] This paper box folding and curling mold can fold and curl the paper box in one go, forming it in one step, saving time and effort, and greatly improving the efficiency of paper box folding and curling. Attached Figure Description

[0023] Figure 1 This is a three-dimensional schematic diagram (top view) of the upper and lower molds in the mold-opening state in specific embodiment 1 of the present invention.

[0024] Figure 2 This is a three-dimensional schematic diagram (from a bottom view) of the upper and lower molds in the mold-opening state in specific embodiment 1 of the present invention.

[0025] Figure 3 This is a schematic diagram of the upper and lower molds in the open state in specific embodiment 1 of the present invention;

[0026] Figure 4 yes Figure 3 A schematic diagram of the structure in which the opening edge of the semi-finished paper box is gradually inserted into the upper annular crimping groove;

[0027] Figure 5 yes Figure 4 Enlarged diagram of A in the middle;

[0028] Figure 6 yes Figure 5 A schematic diagram of the structure in which the opening edge of a semi-finished paper box gradually inserts upwards into the annular rolled edge groove;

[0029] Figure 7 This is a schematic diagram of the upper and lower molds in the closed state in specific embodiment 1 of the present invention;

[0030] Figure 8 yes Figure 7 Enlarged diagram of B in the diagram;

[0031] Figure 9 This is a schematic diagram of the structure of a cardboard box gradually folded and rolled into shape in specific embodiment 1 of the present invention;

[0032] Figure 10 This is a schematic diagram of the structure of a specific embodiment 2 of the present invention;

[0033] Figure 11 yes Figure 10 A schematic diagram of the upper and lower molds in the closed state. Detailed Implementation

[0034] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0035] Example 1

[0036] like Figure 1-9As shown, the paper box folding and edge-rolling forming mold in this embodiment includes an upper mold 1 and a lower mold 2, as well as a mold closing drive mechanism (not shown in the figure) capable of driving the upper mold 1 and the lower mold 2 to perform opening and closing actions. The upper mold 1 includes an upper mold base 11, an upper mold body 12, and a forming head 13. The upper mold body 12 is mounted on the upper mold base 11 and has an upper heating pipe 121. The lower mold 2 includes a lower mold base 21, a lower mold body 22, a base support 23, and an edge-rolling plate 24. The lower mold body 22 is mounted on the lower mold base 21 and has a lower heating pipe 221. The lower part of the upper mold body 12 has an opening. The upper mold cavity 122 faces downwards, and the forming head 13 is installed in the upper mold cavity 122 through the first elastic element 3. The depth of the upper mold cavity 122 is the same as the upper height of the forming head 13. The upper surface of the lower mold body 22 is provided with an upwardly protruding first boss 222. The interior of the first boss 222 is provided with an upwardly opening forming cavity 223. The interior of the lower mold body 22 is provided with a lower mold cavity 224, which is located below and communicates with the forming cavity 223. The lower part 136 of the forming head 13 matches the forming cavity 223. The bottom support 23 is installed through the second elastic element 4. The forming head 13 is installed in the lower mold cavity 224. The center of the rolled edge plate 24 is provided with a guide through hole 241 corresponding to the first boss 222. The rolled edge plate 24 is fitted onto the first boss 222 through the guide through hole 241, and the rolled edge plate 24 is installed on the lower mold body 22 through the third elastic element 5. The height of the rolled edge plate 24 is greater than the height of the first boss 222. The upper part of the forming head 13 matches the guide through hole 241. The upper opening edge of the guide through hole 241 is provided with an upward-facing lower annular rolled edge groove 242, and the lower opening edge of the upper mold cavity 122 is provided with a downward-facing upper annular rolled edge groove. The edge groove 123, the upper annular edge curling groove 123 and the lower annular edge curling groove 242 are correspondingly matched; when the upper mold 1 and the lower mold 2 are in the mold opening state, the upper surface of the bottom support 23 is higher than the upper surface of the edge curling plate 24, and the upper surface of the edge curling plate 24 is higher than the upper opening edge of the forming cavity 223; when the upper mold 1 and the lower mold 2 are in the mold closing process, there is an annular gap 131 between the upper part of the forming head 13 and the inner wall of the guide through hole 241, which allows the cardboard to pass through, the lower end face of the upper mold body 12 is in contact with the upper surface of the edge curling plate 24, and the annular gap 131 is connected to the upper annular edge curling groove 123.

[0037] The forming head 13 is installed in the upper mold cavity 122 via the first elastic member 3, so that the forming head 13 is connected to the upper mold cavity 122 via the first elastic member 3, and the forming head 13 can extend and retract vertically in the upper mold cavity 122. The bottom support 23 is installed in the lower mold cavity 224 via the second elastic member 4, so that the bottom support 23 is connected to the lower mold cavity 224 via the second elastic member 4, and the bottom support 23 can extend and retract vertically in the lower mold cavity 224 and the forming cavity 223. The rolled edge plate 24 is installed on the lower mold body 22 via the third elastic member 5, so that the rolled edge plate 24 is connected to the lower mold body 22 via the third elastic member 5, and the rolled edge plate 24 can extend and retract vertically along the outer wall of the first boss 222.

[0038] The working process of the above-mentioned cardboard box folding and edge-rolling forming mold is as follows: First, the upper mold body 12 is heated by the upper heating pipe 121, and the lower mold body 22 is heated by the lower heating pipe 221; then, the cut cardboard (both the inner and outer surfaces of the cardboard are coated with a waterproof adhesive layer) is conveyed to the upper surface of the bottom support 23. The upper mold 1 is driven to press down by the mold closing drive mechanism, which drives the lower surface of the forming head 13 to descend and gradually clamp the cardboard piece when it contacts the upper surface of the bottom support 23. The upper mold body 12 continues to move downward, and the bottom support 23 retracts downward into the forming cavity 223, so that the four sides of the cardboard contact the upper surface of the edge-rolling plate 24 (i.e., the upper opening edge of the guide through hole 241). The four sides will fold inward to form a semi-finished paper box. At this time, the lower part 136 of the forming head 13 is not yet in the forming cavity 223, and the lower end face of the upper mold body 12 has not yet contacted the upper surface of the edge-rolling plate 24. The opening edge of the semi-finished paper box will naturally move towards the outer wall of the forming head 13 and insert into the upper annular edge-rolling groove 123. Then, the upper mold body 12 continues to move downward until the forming head 13 completely presses the bottom support 23 back into the lower mold cavity 224. The lower part 136 of the forming head 13 is in the forming cavity 223. Under the obstruction of the lower mold cavity 224, the bottom support 23 cannot move downward in the lower mold cavity 224, and the forming head 13 cannot move downward in the forming cavity 223. The movement causes the upper surface of the base 23 and the inner wall of the forming cavity 223 to form a box-like body. The semi-finished paper box is completely held tightly by the forming head 13 and the base 23 in the box-like body. Under the heating of the upper mold body 12 and the lower mold body 22, the four corners of the semi-finished paper box are thermoformed together. At this time, the upper part of the four sides of the semi-finished paper box is in the annular gap 131. The lower end face of the upper mold body 12 begins to contact the upper surface of the edge-rolling plate 24. The lower annular edge-rolling groove 242 of the edge-rolling plate 24 and the upper annular edge-rolling groove 123 of the upper mold body 12 correspond to each other to form an annular edge-rolling groove 6 with an opening facing downward. Then, since the height of the edge-rolling plate 24 is greater than the height of the first boss 222, the annular gap The gap 131 is connected to the annular crimping groove 6. Since the semi-finished paper box, which is completely clamped, has no downward movement space in the forming cavity 223, the upper mold body 12 continues to move downward under the action of the first elastic member 3, causing the crimping plate 24 to move downward along the outer wall of the first boss 222. The length of the four sides of the semi-finished paper box in the annular gap 131 gradually becomes shorter. Under the guidance of the annular crimping groove 6, the opening edge of the semi-finished paper box gradually inserts upward into the annular crimping groove 6, so that the opening edge of the semi-finished paper box gradually bends outward to perform the crimping operation. Finally, the upper mold 1 is driven to rise upward by the mold closing drive mechanism, so that the crimped paper box is demolded to obtain the finished paper box.

[0039] The elastic force of the first elastic element 3 is greater than that of the second elastic element 4, and the elastic force of the third elastic element 5 is greater than that of the second elastic element 4. Designing the elastic forces of the first elastic element 3 and the third elastic element 5 to be relatively large provides sufficient pressure and support, ensuring stable positioning and fixation of the forming head 13, base 23, and edge-rolling plate 24, guaranteeing the stability of the mold during operation and forming. It also allows for a certain pressure fit with components such as the forming head 13 and edge-rolling plate 24, ensuring appropriate pressure and deformation of the semi-finished cardboard box during edge-rolling, thereby achieving accurate edge-rolling and ensuring proper support and positioning of the semi-finished cardboard box during forming. Typically, the elastic force of the first elastic element 3 is greater than that of the third elastic element 5.

[0040] The first elastic element 3 includes a first guide rod 31, a first compression spring 32, and a first limiting block 33. The upper mold body 12 has a first guide hole 124 communicating with the upper mold cavity 122. The first guide rod 31 passes through the first guide hole 124, and the lower end of the first guide rod 31 is connected to the upper surface of the forming head 13. The first limiting block 33 is installed on the upper end of the first guide rod 31 and is engaged with the upper opening edge of the first guide hole 124. The first compression spring 32 is fitted onto the first guide rod 31, and the upper end of the first compression spring 32 contacts the bottom of the groove in the upper mold cavity 122, while the lower end of the first compression spring 32 contacts the upper surface of the forming head 13. When the upper mold 1 and lower mold 2 are in the closed state, neither the forming head 13 nor the base 23 can move downwards. At this time, the upper mold body 12 continues to move downwards along the forming head 13, and the first compression spring 32 is compressed, causing the lower end of the upper mold body 12 to move downwards and contact the upper surface of the rolled edge plate 24. When the upper mold 1 and lower mold 2 are in the open state, the first compression spring 32 returns to its original length, causing the upper mold body 12 to move upwards along the first guide rod 31. However, under the limiting action of the first limiting block 33, the first compression spring 32 is restricted from continuing to lengthen, preventing the upper mold body 12 from moving upwards.

[0041] The upper surface of the forming head 13 is provided with a first limiting hole 132 corresponding to the first guide hole 124, and the lower end of the first compression spring 32 is located in the first limiting hole 132. With this arrangement, the lower end of the first compression spring 32 is limited in the first limiting hole 132, making the first compression spring 32 more stable when it extends and retracts.

[0042] The third elastic element 5 includes a first cylinder 51, a third guide rod 52, a third limiting block 53, and a third compression spring 54. The interior of the rolled edge plate 24 is provided with a third guide hole 243 that runs vertically through it. The lower mold body 22 is provided with a fourth guide hole 225 corresponding to the third guide hole 243. The first cylinder 51 is mounted on the lower mold base 21, with the piston rod of the first cylinder 51 extending upwards. The third guide rod 52 is located in the fourth guide hole 225 and the third guide hole 243. The third limiting block 53 is mounted on the upper end of the third guide rod 52 and engages with the upper opening edge of the third guide hole 243. The lower end of the third guide rod 52 is connected to the end of the piston rod of the first cylinder 51. The third compression spring 54 is fitted onto the third guide rod 52, with the upper end of the third compression spring 54 contacting the lower surface of the rolled edge plate 24 and the lower end of the third compression spring 54 contacting the upper surface of the lower mold body 22. After the edge is rolled, the upper mold 1 is lifted upward by the mold closing drive mechanism. Since the forming head 13 will continue to be pulled downward under the reset action of the first compression spring 32, if the roll plate moves upward at this time due to its ability to extend and retract, the rolled edge of the semi-finished carton will loosen. At this time, the first cylinder 51 of the lower mold body 22 retracts, pulling the third guide rod 52, so that the third compression spring 54 on the third guide rod 52 does not rebound and reset temporarily, thereby pulling the edge rolling plate 24 to prevent it from moving upward. When the upper mold 1 is fully opened, the bottom support 23 extends upward under the rebound reset of the second elastic element 4 and is above the forming cavity 223, so that the finished carton is pushed upward. After the finished carton is pushed out, the first cylinder 51 of the lower mold body 22 extends, releasing the third guide rod 52 and the edge rolling plate 24 connected to it, allowing the edge rolling plate 24 to return to its original position under the rebound action of the third compression spring 54.

[0043] The second elastic element 4 includes a second guide rod 41, a second compression spring 42, and a second limiting block 43. The lower mold body 22 has a second guide hole 226 communicating with the lower mold cavity 224. The second guide rod 41 passes through the second guide hole 226, and the upper end of the second guide rod 41 is connected to the lower surface of the base 23. The second limiting block 43 is installed at the lower end of the second guide rod 41 and is engaged with the lower opening edge of the second guide hole 226. The second compression spring 42 is fitted onto the second guide rod 41, and the upper end of the second compression spring 42 contacts the upper surface of the base 23, while the lower end of the second compression spring 42 contacts the bottom of the groove in the lower mold cavity 224. During the mold closing process of the upper mold 1 and lower mold 2, neither the forming head 13 nor the base support 23 can move downwards. At this time, the second compression spring 42 is compressed in the lower mold cavity 224, and the second guide rod 41 moves downwards along the second guide hole 226, driving the base support 23 downwards until it is blocked by the lower mold cavity 224 and can no longer move downwards. During the mold opening process of the upper mold 1 and lower mold 2, the second compression spring 42 returns to its original length, causing the second guide rod 41 to move upwards along the second guide hole 226, driving the base support 23 upwards. However, under the limiting action of the second limiting block 43, the second compression spring 42 is prevented from continuing to lengthen, so that the base support 23 cannot continue to move upwards. In a more preferred embodiment, the second guide hole 226 is a countersunk hole.

[0044] The lower mold body 22 is provided with two opposing stop blocks 227, both of which are located outside the edge-rolling plate 24. When the upper mold 1 and the lower mold 2 are in the open state, the upper surface of the stop block 227 is higher than the upper surface of the edge-rolling plate 24. In order to solve the problem of the folding order of the cardboard, when the two opposite sides of the cardboard come into contact with the two opposing stop blocks 227, the two opposite sides of the cardboard fold inward first. Then, as the upper mold body 12 continues to move downward, the bottom support 23 retracts downward into the lower mold cavity 224, so that the other two opposite sides of the cardboard come into contact with the upper surface of the edge-rolling plate 24 (i.e., the upper opening edge of the guide through hole 241). The other two opposite sides of the cardboard will then naturally fold inward.

[0045] The cross-sectional area of ​​the lower part 136 of the molding head 13 gradually decreases from top to bottom, and the cross-sectional area of ​​the molding cavity 223 also gradually decreases from top to bottom. With this arrangement, when the lower part 136 of the molding head 13 is in the molding cavity 223, the lower part 136 of the molding head 13 matches the molding cavity 223.

[0046] The edge-curling plate 24 is equipped with an edge-curling heating tube 244. The edge-curling plate 24 is heated by the edge-curling heating tube 244. When the opening edge of the semi-finished paper box is gradually inserted into the annular edge-curling groove 6, the heating of the edge-curling plate 24 can further accelerate the gradual outward bending of the opening edge of the semi-finished paper box.

[0047] The upper surface of the base 23 is provided with an upward protruding second boss 231, and the lower surface of the forming head 13 is provided with a downward opening mold groove 133, which corresponds to and cooperates with the second boss 231. When the upper mold 1 and the lower mold 2 are in the mold closing state, the second boss 231 is in the mold groove 133.

[0048] Typically, the upper mold base 11 is connected to the power output end of the mold closing drive mechanism. The mold closing drive mechanism can be a cylinder, a hydraulic cylinder, or a structure that combines a motor and a transmission link.

[0049] Example 2

[0050] like Figure 10-11 As shown, the difference between the cardboard box folding and curling forming mold in this embodiment and that in Embodiment 1 is:

[0051] The upper mold body 12 is equipped with a second cylinder 125, with the piston rod of the second cylinder 125 extending downwards. The upper mold body 12 also has a fifth guide hole 126 communicating with the upper mold cavity 122. The piston rod of the second cylinder 125 passes through the fifth guide hole 126, with its end positioned within the upper mold cavity 122. The upper surface of the forming head 13 is connected to the end of the piston rod of the second cylinder 125. The forming head 13 has an air passage 134 connected to an external adsorption device, and its lower surface has multiple suction holes 135 communicating with the air passage 134. This configuration allows the forming head 13 to extend and retract vertically within the upper mold cavity 122. When the upper mold 1 and the lower mold 2 are opened, the external adsorption device is activated to evacuate the air passage 134 of the forming head 13, so that a negative pressure zone is formed at each air suction hole 135. The forming head 13 adsorbs the already rolled paper box, and then the second cylinder 125 retracts upward, driving the forming head 13 and the paper box it adsorbs to move upward, so as to prevent the roll plate from moving upward and causing the rolled edge of the semi-finished paper box to loosen.

[0052] The third elastic element 5 includes a third guide rod 52, a third limiting block 53, and a third compression spring 54. The rolled edge plate 24 has a through-hole 243 inside, with the third guide rod 52 positioned within it. The third limiting block 53 is mounted on the upper end of the third guide rod 52 and engages with the upper opening edge of the third guide hole 243. The lower end of the third guide rod 52 is connected to the upper surface of the lower mold body 22. The third compression spring 54 is fitted onto the third guide rod 52, with its upper end contacting the lower surface of the rolled edge plate 24 and its lower end contacting the upper surface of the lower mold body 22. When the upper mold 1 and lower mold 2 are in the closed state, neither the forming head 13 nor the base 23 can move downwards. At this time, the upper mold body 12 continues to move downwards along the forming head 13, compressing the third compression spring 54 and causing the rolled edge plate 24 to move downwards along the outer wall of the first boss 222. When the upper mold 1 and lower mold 2 are in the open state, the third compression spring 54 returns to its original length, causing the rolled edge plate 24 to move upward along the outer wall of the first boss 222. However, under the limiting action of the third limiting block 53, the third compression spring 54 is restricted from continuing to lengthen, preventing the rolled edge plate 24 from moving upward further. In a more preferred embodiment, the third guide hole 243 is a countersunk hole.

[0053] The upper surface of the lower mold body 22 is provided with a third limiting hole 228 corresponding to the third guide hole 243, and the lower end of the third compression spring 54 is located in the third limiting hole 228. With this arrangement, the lower end of the third compression spring 54 is limited in the third limiting hole 228, making the third compression spring 54 more stable when it extends and retracts.

[0054] 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 invention are included within the scope of protection of this invention. Those skilled in the art can 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 invention or exceed the scope defined in these claims, all of which should fall within the scope of protection of this invention.

Claims

1. A paper box folding and edge-rolling forming mold, comprising an upper mold and a lower mold, and a mold-closing drive mechanism capable of driving the upper mold and the lower mold to perform opening and closing actions, the upper mold comprising an upper mold base, an upper mold body, and a forming head, the upper mold body being mounted on the upper mold base, and an upper heating tube being provided in the upper mold body; the lower mold comprising a lower mold base, a lower mold body, and a base support, the lower mold body being mounted on the lower mold base, and a lower heating tube being provided in the lower mold body; the lower part of the upper mold body is provided with a downward-opening upper mold cavity, the forming head being mounted in the upper mold cavity via a first elastic element, the depth of the upper mold cavity being the same as the upper height of the forming head; the upper surface of the lower mold body is provided with an upward-protruding first boss, the interior of the first boss being provided with an upward-opening forming cavity, the interior of the lower mold body being provided with a lower mold cavity, the lower mold cavity being located below and communicating with the forming cavity, the lower part of the forming head matching the forming cavity, and the base support being mounted in the lower mold cavity via a second elastic element; characterized in that: The lower mold also includes a rolled edge plate and two opposing stop blocks, both of which are located outside the rolled edge plate. When the upper and lower molds are in the open state, the upper surface of the stop blocks is higher than the upper surface of the rolled edge plate. The center of the rolled edge plate has a guide hole corresponding to the first boss. The rolled edge plate is fitted onto the first boss through the guide hole, and the rolled edge plate is mounted on the lower mold body through a third elastic element. The elastic force of the first elastic element is greater than that of the second elastic element, and the elastic force of the third elastic element is greater than that of the second elastic element. Elasticity; the edge-rolling plate is equipped with an edge-rolling heating tube, and the height of the edge-rolling plate is greater than the height of the first boss. The upper part of the forming head matches the guide through hole; the upper opening edge of the guide through hole is provided with an upward-facing lower annular edge-rolling groove, and the lower opening edge of the upper mold cavity is provided with a downward-facing upper annular edge-rolling groove, which corresponds to and fits with the lower annular edge-rolling groove; when the upper mold and lower mold are in the mold-opening state, the upper surface of the base is higher than the upper surface of the edge-rolling plate, and the upper surface of the edge-rolling plate is higher than the upper opening edge of the forming cavity; when the upper mold... During the mold closing process, there is an annular gap between the upper part of the forming head and the inner wall of the guide hole, allowing the cardboard to pass through. The lower end face of the upper mold body contacts and fits with the upper surface of the edge-rolling plate, and the annular gap communicates with the upper annular edge-rolling groove. When the cardboard is placed on the base, the two opposite edges of the cardboard first contact the two opposite stop blocks and fold inward. Then, as the upper mold body continues to move downward, the base retracts into the lower mold cavity, causing the other two opposite edges of the cardboard to contact the upper surface of the edge-rolling plate and subsequently fold inward naturally. The paper box is folded and then made into a semi-finished paper box. Under the heating of the upper and lower molds, the four corners of the semi-finished paper box are thermoformed together. At this time, the upper part of the four sides of the semi-finished paper box is in the annular gap. The lower annular curling groove of the curling plate and the upper annular curling groove of the upper mold are matched to form an annular curling groove with the opening facing downward. Under the guidance of the annular curling groove, the opening edge of the semi-finished paper box is gradually inserted into the annular curling groove and gradually bent outward to perform the curling operation. The folding and curling of the paper box are completed in one mold closing.

2. The paper box folding and edge-rolling forming mold as described in claim 1, characterized in that: The first elastic element includes a first guide rod, a first compression spring, and a first limiting block. The upper mold body has a first guide hole communicating with the upper mold cavity. The first guide rod passes through the first guide hole, and the lower end of the first guide rod is connected to the upper surface of the forming head. The first limiting block is installed on the upper end of the first guide rod, and the first limiting block is engaged with the upper opening edge of the first guide hole. The first compression spring is fitted onto the first guide rod, and the upper end of the first compression spring contacts the bottom of the groove of the upper mold cavity, while the lower end of the first compression spring contacts the upper surface of the forming head.

3. The paper box folding and edge-rolling forming mold as described in claim 2, characterized in that: The upper surface of the forming head is provided with a first limiting hole corresponding to the first guide hole, and the lower end of the first compression spring is located in the first limiting hole.

4. The paper box folding and edge-rolling forming mold as described in claim 2, characterized in that: The third elastic element includes a first cylinder, a third guide rod, a third limiting block, and a third compression spring. The interior of the rolled edge plate is provided with a third guide hole that runs vertically through it. The lower mold body is provided with a fourth guide hole corresponding to the third guide hole. The first cylinder is mounted on the lower mold base, with the piston rod of the first cylinder extending upwards. The third guide rod is located in both the fourth and third guide holes. The third limiting block is mounted on the upper end of the third guide rod and engages with the upper opening edge of the third guide hole. The lower end of the third guide rod is connected to the end of the piston rod of the first cylinder. The third compression spring is fitted onto the third guide rod, with its upper end contacting the lower surface of the rolled edge plate and its lower end contacting the upper surface of the lower mold body.

5. The paper box folding and edge-rolling forming mold as described in claim 1, characterized in that: The upper mold body is equipped with a second cylinder inside, with the piston rod of the second cylinder extending downwards. The upper mold body is equipped with a fifth guide hole communicating with the upper mold cavity. The piston rod of the second cylinder passes through the fifth guide hole and the end of the piston rod of the second cylinder is placed in the upper mold cavity. The upper surface of the forming head is connected to the end of the piston rod of the second cylinder. The interior of the forming head is equipped with an air passage connected to an external adsorption device. The lower surface of the forming head is equipped with multiple suction holes communicating with the air passage.

6. The paper box folding and edge-rolling forming mold as described in claim 5, characterized in that: The third elastic element includes a third guide rod, a third limiting block, and a third compression spring. The interior of the rolled edge plate is provided with a third guide hole that runs vertically through it. The third guide rod is located in the third guide hole. The third limiting block is installed on the upper end of the third guide rod and engages with the upper opening edge of the third guide hole. The lower end of the third guide rod is connected to the upper surface of the lower mold body. The third compression spring is fitted on the third guide rod. The upper end of the third compression spring contacts the lower surface of the rolled edge plate, and the lower end of the third compression spring contacts the upper surface of the lower mold body.

7. The paper box folding and edge-rolling forming mold as described in claim 1, characterized in that: The second elastic element includes a second guide rod, a second compression spring, and a second limiting block. The lower mold body has a second guide hole communicating with the lower mold cavity. The second guide rod passes through the second guide hole, and the upper end of the second guide rod is connected to the lower surface of the base. The second limiting block is installed at the lower end of the second guide rod and is engaged with the lower opening edge of the second guide hole. The second compression spring is fitted onto the second guide rod, and the upper end of the second compression spring contacts the upper surface of the base, while the lower end of the second compression spring contacts the bottom of the groove in the lower mold cavity.

8. The paper box folding and edge-rolling forming mold as described in claim 1, characterized in that: The cross-sectional area of ​​the lower part of the forming head gradually decreases from top to bottom, and the cross-sectional area of ​​the forming cavity gradually decreases from top to bottom; The upper surface of the base is provided with an upwardly protruding second boss, and the lower surface of the forming head is provided with a downwardly opening molding groove, which corresponds to and cooperates with the second boss; when the upper mold and the lower mold are in the mold-closed state, the second boss is in the molding groove.

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