CN221292478U - Paper box folding hemming forming die - Google Patents

Abstract

The utility model relates to a paper box folding hemming forming die which comprises an upper die and a lower die, wherein the upper die comprises an upper die seat, an upper die body and a forming head, and the upper die body is arranged on the upper die seat; the lower die comprises a lower die seat, a lower die body, a bottom bracket and a edge rolling plate, and the lower die body is arranged on the lower die seat; the lower part of the upper die body is provided with an upper die cavity, and the forming head is arranged in the upper die cavity through a first elastic piece; the upper surface of the lower die body is provided with a first boss, a forming cavity is arranged in the first boss, a lower die cavity is arranged in the lower die body, the lower die cavity is positioned below the forming cavity and is communicated with the forming cavity, the lower part of the forming head is matched with the forming cavity, and the bottom bracket is arranged in the lower die cavity through a second elastic piece; when the upper die and the lower die are in an open die state, the upper surface of the bottom support is higher than the upper surface of the hemming plate, and the upper surface of the hemming plate is higher than the upper end opening edge of the forming cavity. The paper box folding and hemming forming die can perform hemming and hemming operation on the paper box at one time, saves time and labor, and improves the folding and hemming efficiency of the paper box.

Description

Paper box folding hemming forming die

Technical Field

The utility model relates to a paper box forming die, in particular to a paper box folding hemming forming die.

Background

Paper packaging boxes are a type of container used for containing goods. At present, paper packaging boxes are generally formed by automatic folding through a box folding machine. For example, publication No. CN205202318U discloses a box folding machine, which comprises a workbench and a bracket arranged on the workbench, wherein a pressing die is arranged on the workbench, the pressing die comprises a bottom die fixed on the workbench, a pressing cover connected with a power cylinder piston rod on the bracket and positioned above the bottom die, and folding pieces movably arranged on the workbench and positioned in front of, behind, left of and right of the bottom die. The paper board for the packaging box can be conveniently placed on the bottom die, the pressing cover is driven to be pressed down by the power cylinder above the paper board, four sides of the paper board are folded downwards, and folded paper board folding corners are folded to corresponding side surfaces by the movement of the front folding piece, the rear folding piece or the left folding piece and the right folding piece which are opposite to each other, so that the box folding operation is completed. However, the folding box machine only adopts a plurality of steps to fold the paper board into a semi-finished paper box, does not relate to edge folding and edge curling of the opening edge of the paper box, and also needs to convey the semi-finished paper box to other edge folding mechanisms for edge folding, then conveys the folded semi-finished paper box to the next station for heating and edge curling, the subsequent edge folding and edge curling operation is complicated, the folding and edge curling efficiency is low, more conveying time of the semi-finished paper box is required, secondary heating is required for edge curling, and the energy consumption is high.

Disclosure of utility model

The utility model aims to solve the technical problem of providing a paper box folding hemming forming die which can perform hemming and hemming operation on a paper box at one time, saves time and labor and improves folding hemming efficiency of the paper box.

In order to solve the technical problems, the utility model adopts the following technical scheme:

The paper box folding and hemming forming die comprises an upper die, a lower die and a die clamping driving mechanism capable of driving the upper die and the lower die to open and close, wherein the upper die comprises an upper die seat, an upper die body and a forming head, the upper die body is arranged on the upper die seat, and an upper heating pipe is arranged in the upper die body; the lower die comprises a lower die seat, a lower die body and a bottom bracket, wherein the lower die body is arranged on the lower die seat, and a lower heating pipe is arranged in the lower die body; the method is characterized in that: the lower part of the upper die body is provided with an upper die cavity with a downward opening, the forming head is arranged in the upper die cavity through a first elastic piece, and the depth of the upper die cavity is the same as the height of the upper part of the forming head; the upper surface of the lower die body is provided with a first boss protruding upwards, a forming cavity with an upward opening is arranged in the first boss, a lower die cavity is arranged in the lower die body, the lower die cavity is positioned below the forming cavity and is communicated with the forming cavity, the lower part of the forming head is matched with the forming cavity, and the collet is arranged in the lower die cavity through a second elastic piece; the lower die further comprises a hemming plate, a guide through hole corresponding to the first boss is formed in the center of the hemming plate, the hemming plate is sleeved on the first boss through the guide through hole, the hemming plate is mounted on the lower die body through a third elastic piece, the height of the hemming plate is larger than that of the first boss, and the upper portion of the forming head is matched with the guide through hole; a lower annular hemming groove with an upward opening is arranged on the upper end opening edge of the guide through hole, an upper annular hemming groove with a downward opening is arranged on the lower end opening edge of the upper die cavity, and the upper annular hemming groove is correspondingly matched with the lower annular hemming groove; when the upper die and the lower die are in an open die state, the upper surface of the bottom support is higher than the upper surface of the hemming plate, and the upper surface of the hemming plate is higher than the upper end opening edge of the forming cavity; when the upper die and the lower die are in the die assembly process, an annular gap for the paperboard to pass through is formed between the upper part of the forming head and the inner wall of the guide through hole, the lower end surface of the upper die body is in contact fit with the upper surface of the edge rolling plate, and the annular gap is communicated with the upper annular edge rolling groove.

The forming head is arranged in the upper die cavity through the first elastic piece, so that the forming head is connected with the upper die cavity through the first elastic piece, and the forming head can stretch out and draw back up and down in the upper die cavity. The bottom bracket is arranged in the lower die cavity through the second elastic piece, so that the bottom bracket is connected with the lower die cavity through the second elastic piece, and the bottom bracket can stretch out and draw back up and down in the lower die cavity and the forming die cavity. Above-mentioned hemming plate passes through the third elastic component and installs on lower die body for the hemming plate passes through the third elastic component and is connected with lower die body, and the hemming plate can be followed the outer wall of first boss and stretched out and draw back from top to bottom.

The working process of the paper box folding hemming forming die is as follows: heating the upper die body through an upper heating pipe and heating the lower die body through a lower heating pipe; then, conveying the cut paper board (the waterproof glue layers are compounded on the inner surface and the outer surface of the paper board) to the upper surface of the collet, driving the upper die to start to press down through a die clamping driving mechanism, driving the lower surface of the forming head to descend to be in contact with the upper surface of the collet to gradually clamp the paper sheet, continuously enabling the upper die body to move downwards, retracting the collet downwards into the forming cavity, enabling four sides of the paper board to be in contact with the upper surface of the hemming plate (namely, the upper end opening edge of the guide through hole), inwards folding the four sides of the paper board to form a semi-finished paper box, wherein the lower part of the forming head is not positioned in the forming cavity, the lower end surface of the upper die body is not in contact with the upper surface of the hemming plate, and the opening edge of the semi-finished paper box is drawn towards the outer side wall of the forming head and inserted into the upper annular hemming groove; then, the upper die body continues to move downwards until the forming head completely presses the bottom support back into the lower die cavity, the lower part of the forming head is positioned in the forming die cavity, the bottom support can not move downwards in the lower die cavity under the blocking of the lower die cavity, the forming head can not move downwards in the forming die cavity any more, the upper surface of the bottom support and the inner wall of the forming die cavity form a box-shaped body, the semi-finished paper box is completely held tightly by the forming head and the bottom support in the box-shaped body, four corners of the semi-finished paper box are mutually attached to carry out thermoforming under the heating of the upper die body and the lower die body, at the moment, the upper parts of four sides of the semi-finished paper box are positioned in annular gaps, the lower end face of the upper die body and the upper surface of the edge rolling plate are contacted, and the lower annular edge rolling groove of the edge rolling plate and the upper annular edge rolling groove of the upper die body are correspondingly matched to form an annular edge rolling groove with a downward opening; next, because the height of the edge rolling plate is larger than that of the first boss, the annular gap is communicated with the annular edge rolling groove, and because the fully-held semi-finished paper box does not have a downward movement space in the forming cavity, the upper die body continues to move downwards under the action of the first elastic piece, the edge rolling plate is driven to move downwards along the outer wall of the first boss, the four sides of the semi-finished paper box in the annular gap are gradually shortened, and the opening edge of the semi-finished paper box is gradually inserted into the annular edge rolling groove upwards under the guidance of the annular edge rolling groove, so that the opening edge of the semi-finished paper box is gradually bent outwards to carry out edge rolling operation; and finally, driving the upper die to lift upwards through a die assembly driving mechanism, so that the curled paper box is demoulded, and a finished paper box is manufactured.

In a preferred embodiment, the elastic force of the first elastic member is greater than the elastic force of the second elastic member, and the elastic force of the third elastic member is greater than the elastic force of the second elastic member. The elastic force of the first elastic piece and the elastic force of the third elastic piece are designed to be relatively large, so that enough pressure and supporting force can be provided, the forming head, the collet and the hemming plate can be stably positioned and fixed, and the stability of the die in the operation and forming processes is ensured; and the semi-finished paper box can form certain press fit with the forming head, the hemming plate and other parts, so that the semi-finished paper box can be properly pressed and deformed in the hemming process, an accurate hemming forming effect is realized, and the semi-finished paper box can be properly supported and positioned in the forming process. Typically, the elastic force of the first elastic member is greater than the elastic force of the third elastic member.

In a preferred scheme, the first elastic piece comprises a first guide rod, a first compression spring and a first limiting block, a first guide hole communicated with the upper die cavity is formed in the upper die body, the first guide rod penetrates through the first guide hole, the lower end of the first guide rod is connected with the upper surface of the forming head, the first limiting block is arranged at the upper end of the first guide rod, and the first limiting block is in snap fit with the edge of the upper end opening of the first guide hole; the first compression spring is sleeved on the first guide rod, the upper end of the first compression spring is in contact fit with the bottom of the upper die cavity, and the lower end of the first compression spring is in contact fit with the upper surface of the forming head. When the upper die and the lower die are in a die closing state, the forming head and the bottom support can not move downwards any more, at the moment, the upper die body moves downwards continuously along the forming head, and the first compression spring is compressed, so that the lower end face of the upper die body moves downwards and is in contact fit with the upper surface of the edge rolling plate. When the upper die and the lower die are in the die opening state, the first compression spring is reset to restore a certain length, so that the upper die body moves upwards along the first guide rod, but under the limiting effect of the first limiting block, the first compression spring is limited to continue to lengthen, and the upper die body cannot continue to move upwards. In a more preferred scheme, the first guide hole is a counter bore.

In a further preferred scheme, 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 positioned in the first limiting hole. Through this kind of setting, with the lower extreme of first compression spring spacing in first spacing hole, make first compression spring more stable when flexible.

In a further preferred scheme, the third elastic piece comprises a first air cylinder, a third guide rod, a third limiting block and a third compression spring, a third guide hole which is vertically penetrated is formed in the hemming plate, a fourth guide hole corresponding to the third guide hole is formed in the lower die body, the first air cylinder is installed on the lower die base, the extending direction of a piston rod of the first air cylinder is upward, the third guide rod is positioned in the fourth guide hole and the third guide hole, and the third limiting block is installed on the upper end of the third guide rod and is in snap fit with the edge of an upper end opening in the third guide hole; the lower end of the third guide rod is connected with the tail end of a piston rod of the first cylinder; the third compression spring is sleeved on the third guide rod, the upper end of the third compression spring is in contact fit with the lower surface of the hemming plate, and the lower end of the third compression spring is in contact fit with the upper surface of the lower die body. After the hemming is completed, the upper die is driven to be lifted upwards by the die clamping driving mechanism, and the forming head continues to be pulled downwards under the reset action of the first compression spring, so that if the material rolling plate moves upwards due to up-and-down expansion at the moment, the curled edge of the opening of the semi-finished paper box is loosened; at this time, through the first cylinder shrink of lower die body, pull the third guide bar, make the third compression spring on the third guide bar not kick-back reset temporarily, and then pull the edge rolling board and do not upwards move, wait until the time when last mould is opened completely, the collet upwards stretches out and is in the top of shaping chamber under the kick-back reset of second elastic component for finished product carton is ejecting upwards, the first cylinder of lower die body just extends after the finished product carton is ejecting, loosen the third guide bar and the edge rolling board of being connected with it, let the edge rolling board resume original position under the resilience effect of third compression spring.

In another preferred scheme, the inside of last die body is equipped with the second cylinder, and the piston rod direction of stretching out of second cylinder is equipped with the communicating fifth guiding hole of last die cavity in the inside of last die body, the piston rod of second cylinder pass fifth guiding hole and make the piston rod end of second cylinder be in last die cavity, the upper surface of shaping head and the piston rod end-to-end connection of second cylinder, the inside of shaping head is equipped with the air flue of being connected with external adsorption equipment, is equipped with a plurality of suction holes with the air flue intercommunication on the lower surface of shaping head. By this arrangement, it is achieved that the forming head can be extended and retracted up and down in the upper die cavity. When the upper die and the lower die are opened, external adsorption equipment is started, the air passage of the forming head is vacuumized, negative pressure areas are formed at the air suction holes, the curled paper boxes are adsorbed by the forming head, the second air cylinder is contracted upwards, the forming head and the adsorbed paper boxes are driven to move upwards, and the phenomenon that the rolled edges of the opening of the semi-finished paper boxes are loosened due to upward movement of the material rolling plate is avoided.

In a further preferred scheme, the third elastic piece comprises a third guide rod, a third limiting block and a third compression spring, a third guide hole which is vertically penetrated is formed in the hemming plate, the third guide rod is positioned in the third guide hole, and the third limiting block is arranged at the upper end of the third guide rod and is in snap fit with the edge of an opening at the upper end in the third guide hole; the lower end of the third guide rod is connected with the upper surface of the lower die body; the third compression spring is sleeved on the third guide rod, the upper end of the third compression spring is in contact fit with the lower surface of the hemming plate, and the lower end of the third compression spring is in contact fit with the upper surface of the lower die body. When the upper die and the lower die are in a die closing state, the forming head and the bottom support can not move downwards any more, at the moment, the upper die body continues to move downwards along the forming head, and the third compression spring is compressed, so that the hemming plate moves downwards along the outer wall of the first boss. When the upper die and the lower die are in the die opening state, the third compression spring is reset to restore a certain length, so that the hemming plate moves upwards along the outer wall of the first boss, but the third compression spring is limited to continue to lengthen under the limiting action of the third limiting block, so that the hemming plate cannot continue to move upwards. In a more preferred scheme, the third guide hole is a counter bore.

In a still further preferred scheme, a third limiting hole corresponding to the third guiding hole is formed in the upper surface of the lower die body, and the lower end of the third compression spring is located in the third limiting hole. Through this kind of setting, with the lower extreme of third compression spring spacing in the spacing hole of third, make third compression spring more stable when flexible.

In a preferred scheme, the second elastic piece comprises a second guide rod, a second compression spring and a second limiting block, a second guide hole communicated with the lower die cavity is formed in the lower die body, the second guide rod penetrates through the second guide hole, the upper end of the second guide rod is connected with the lower surface of the bottom support, the second limiting block is arranged at the lower end of the second guide rod, and the second limiting block is in snap fit with the opening edge of the lower end of the second guide hole; the second compression spring is sleeved on the second guide rod, the upper end of the second compression spring is in contact fit with the upper surface of the bottom bracket, and the lower end of the second compression spring is in contact fit with the bottom of the lower die cavity. When the upper die and the lower die are in the die assembly process, the forming head and the collet can not move downwards any more, at the moment, the second compression spring is compressed in the lower die cavity, the second guide rod moves downwards along the second guide hole to drive the collet to move downwards until the collet is blocked by the lower die cavity and can not move downwards any more. When the upper die and the lower die are opened, the second compression spring is reset to restore a certain length, so that the second guide rod moves upwards along the second guide hole to drive the bottom bracket to move upwards, but under the limiting effect of the second limiting block, the second compression spring is limited to be continuously lengthened, and the bottom bracket cannot continuously move upwards. In a more preferred scheme, the second guide hole is a counter bore.

In the preferred scheme, two blocking blocks which are oppositely arranged are arranged on the lower die body, and the two blocking blocks are positioned at the outer side of the edge rolling plate; when the upper die and the lower die are in the die opening state, the upper surface of the baffle block is higher than the upper surface of the hemming plate. In order to solve the sequence problem of folding the paper box, when two opposite sides of the paper board are contacted with two opposite baffle blocks, the two opposite sides of the paper board are folded inwards in advance, and then the bottom bracket is retracted downwards into the lower die cavity along with the upper die body, so that the other two opposite sides of the paper board are contacted with the upper surface of the edge rolling plate (namely the upper end opening edge of the guide through hole), and then the other two opposite sides of the paper board are folded inwards naturally.

In the preferred scheme, a hemming heating pipe is arranged in the hemming plate. The hemming plate is heated through the hemming heating pipe, and when the opening edge of the semi-finished paper box is gradually inserted into the annular hemming groove upwards, the opening edge of the semi-finished paper box can be further accelerated to be gradually bent outwards by the heating of the hemming plate.

In a preferred embodiment, the cross-sectional area of the lower portion of the molding head is gradually reduced from top to bottom, and the cross-sectional area of the molding cavity is gradually reduced from top to bottom. With this arrangement, the lower portion of the forming head mates with the forming cavity when the lower portion of the forming head is in the forming cavity.

In the preferred scheme, a second boss protruding upwards is arranged on the upper surface of the bottom support, a pressing die groove with a downward opening is arranged on the lower surface of the forming head, and the pressing die groove is correspondingly matched with the second boss; when the upper die and the lower die are in a die clamping state, the second boss is positioned in the die pressing groove.

In general, the upper die holder is connected to a power output end of the die clamping driving mechanism, and the die clamping driving mechanism may be a cylinder, an oil cylinder, or a motor and a transmission link rod.

Compared with the prior art, the utility model has the following advantages:

the paper box folding and hemming forming die can perform hemming and hemming operation on the paper box at one time, form the paper box at one time, save time and labor and greatly improve the folding and hemming efficiency of the paper box.

Drawings

Fig. 1 is a schematic view (top view) showing a perspective state in which an upper die and a lower die are in an open state in embodiment 1 of the present utility model;

fig. 2 is a schematic diagram of the upper die and the lower die in a three-dimensional state (bottom view) in the open state in embodiment 1 of the present utility model;

FIG. 3 is a schematic diagram showing the structure of the upper and lower molds in the open state in embodiment 1 of the present utility model;

FIG. 4 is a schematic view of the semi-finished carton of FIG. 3 with the open rim progressively inserted into the upper annular hemming slot;

FIG. 5 is an enlarged schematic view of A in FIG. 4;

FIG. 6 is a schematic view of the semi-finished carton of FIG. 5 with the open rim progressively inserted upwardly into the annular hemming groove;

FIG. 7 is a schematic view showing a structure in which an upper die and a lower die are in a clamped state in embodiment 1 of the present utility model;

FIG. 8 is an enlarged schematic view of B in FIG. 7;

FIG. 9 is a schematic view showing the structure of the paper board in the embodiment 1 of the utility model which is gradually folded and curled into the paper box;

Fig. 10 is a schematic structural view of embodiment 2 of the present utility model;

fig. 11 is a schematic view showing a structure in which the upper die and the lower die in fig. 10 are in a clamped state.

Detailed Description

The utility model is described in detail below with reference to the drawings and the specific embodiments.

Example 1

As shown in fig. 1 to 9, the folding and hemming forming die for the paper box in the embodiment comprises an upper die 1, a lower die 2 and a die clamping driving mechanism (not labeled in the figure) capable of driving the upper die 1 and the lower die 2 to open and close, wherein the upper die 1 comprises an upper die holder 11, an upper die body 12 and a forming head 13, the upper die body 12 is arranged on the upper die holder 11, and an upper heating pipe 121 is arranged in the upper die body 12; the lower die 2 comprises a lower die seat 21, a lower die body 22, a bottom bracket 23 and a hemming plate 24, wherein the lower die body 22 is arranged on the lower die seat 21, and a lower heating pipe 221 is arranged in the lower die body 22; the lower part of the upper die body 12 is provided with an upper die cavity 122 with a downward opening, the forming head 13 is arranged in the upper die cavity 122 through the first elastic piece 3, and the depth of the upper die cavity 122 is the same as the upper part of the forming head 13; the upper surface of the lower die body 22 is provided with a first boss 222 protruding upwards, a forming cavity 223 with an upward opening is arranged in the first boss 222, a lower die cavity 224 is arranged in the lower die body 22, the lower die cavity 224 is positioned below the forming cavity 223 and is communicated with the forming cavity 223, the lower part 136 of the forming head 13 is matched with the forming cavity 223, and the bottom bracket 23 is arranged in the lower die cavity 224 through a second elastic piece 4; the center of the edge rolling plate 24 is provided with a guide through hole 241 corresponding to the first boss 222, the edge rolling plate 24 is sleeved on the first boss 222 through the guide through hole 241, the edge rolling plate 24 is arranged on the lower die body 22 through the third elastic piece 5, the height of the edge rolling plate 24 is larger than that of the first boss 222, and the upper part of the forming head 13 is matched with the guide through hole 241; a lower annular hemming groove 242 with an upward opening is arranged on the upper end opening edge of the guide through hole 241, an upper annular hemming groove 123 with a downward opening is arranged on the lower end opening edge of the upper die cavity 122, and the upper annular hemming groove 123 is correspondingly matched with the lower annular hemming groove 242; when the upper die 1 and the lower die 2 are in the die-opening state, the upper surface of the bottom bracket 23 is higher than the upper surface of the hemming plate 24, and the upper surface of the hemming plate 24 is higher than the upper end opening edge of the forming cavity 223; when the upper die 1 and the lower die 2 are in die assembly, an annular gap 131 for the paper board to pass through is arranged between the upper part of the forming head 13 and the inner wall of the guide through hole 241, the lower end surface of the upper die body 12 is in contact fit with the upper surface of the edge rolling plate 24, and the annular gap 131 is communicated with the upper annular edge rolling groove 123.

The above-described molding head 13 is mounted in the upper cavity 122 by the first elastic member 3 such that the molding head 13 is connected to the upper cavity 122 by the first elastic member 3, and the molding head 13 can be vertically expanded and contracted in the upper cavity 122. The shoe 23 is mounted in the lower cavity 224 by the second elastic member 4 such that the shoe 23 is connected to the lower cavity 224 by the second elastic member 4 and the shoe 23 can be vertically expanded and contracted in the lower cavity 224 and the molding cavity 223. The hemming plate 24 is mounted on the lower die body 22 through the third elastic member 5, such that the hemming plate 24 is connected to the lower die body 22 through the third elastic member 5, and the hemming plate 24 can be extended and retracted up and down along the outer wall of the first boss 222.

The working process of the paper box folding hemming forming die is as follows: the upper die body 12 is heated by the upper heating pipe 121 and the lower die body 22 is heated by the lower heating pipe 221; then, the cut paper board (the waterproof glue layers are compounded on the inner surface and the outer surface of the paper board) is conveyed to the upper surface of the bottom support 23, the upper die 1 is driven by the die clamping driving mechanism to start to press down, the lower surface of the forming head 13 is driven to be in contact with the upper surface of the bottom support 23 to gradually clamp the paper sheet, the upper die body 12 is continuously moved downwards, the bottom support 23 is retracted downwards into the forming cavity 223, four sides of the paper board are in contact with the upper surface of the hemming plate 24 (namely, the upper end opening edge of the guide through hole 241), the four sides of the paper board are folded inwards to form a semi-finished paper box, at the moment, the lower part 136 of the forming head 13 is not in the forming cavity 223, the lower end surface of the upper die body 12 is not in contact with the upper surface of the hemming plate 24, and the opening edge of the semi-finished paper box is folded towards the outer side wall of the forming head 13 and is inserted into the upper annular hemming groove 123; then, the upper die body 12 continues to move downwards until the forming head 13 completely presses the bottom support 23 back into the lower die cavity 224, the lower part 136 of the forming head 13 is positioned in the forming cavity 223, the bottom support 23 can not move downwards in the lower die cavity 224 under the blocking of the lower die cavity 224, the forming head 13 can not move downwards in the forming cavity 223 any more, the upper surface of the bottom support 23 and the inner wall of the forming cavity 223 form a box-shaped body, the semi-finished product paper box is completely held tightly by the forming head 13 and the bottom support 23 in the box-shaped body, four corners of the semi-finished product paper box are mutually attached to each other for thermal forming under the heating of the upper die body 12 and the lower die body 22, at the moment, the upper parts of four sides of the semi-finished product paper box are positioned in the annular gaps 131, the lower end face of the upper die body 12 and the upper surface of the edge rolling plate 24 are contacted, and the lower annular edge rolling groove 242 of the edge rolling plate 24 and the upper annular edge rolling groove 123 of the upper die body 12 correspondingly cooperate to form an annular edge rolling groove 6 with a downward opening; next, since the height of the edge rolling plate 24 is greater than the height of the first boss 222, the annular gap 131 is communicated with the annular edge rolling groove 6, and since the fully-held semi-finished paper box has no downward movement space in the forming cavity 223, the upper die body 12 continues to move downwards under the action of the first elastic piece 3, the edge rolling plate 24 is driven to move downwards along the outer wall of the first boss 222, the four sides of the semi-finished paper box in the annular gap 131 are gradually shortened, and the opening edge of the semi-finished paper box is gradually inserted upwards into the annular edge rolling groove 6 under the guidance of the annular edge rolling groove 6, so that the opening edge of the semi-finished paper box is gradually outwards bent for edge rolling operation; and finally, driving the upper die 1 to lift upwards through a die closing driving mechanism, and demoulding the curled paper box to obtain a finished paper box.

The elastic force of the first elastic member 3 is greater than the elastic force of the second elastic member 4, and the elastic force of the third elastic member 5 is greater than the elastic force of the second elastic member 4. The elastic force of the first elastic member 3 and the third elastic member 5 is designed to be relatively large, so that enough pressure and supporting force can be provided, the forming head 13, the collet 23 and the hemming plate 24 can be stably positioned and fixed, and the stability of the die in the operation and forming process is ensured; and the semi-finished paper box can form certain press fit with the forming head 13, the edge rolling plate 24 and other parts, so that the semi-finished paper box can be properly pressed and deformed in the edge rolling process, an accurate edge rolling forming effect is realized, and proper support and positioning of the semi-finished paper box in the forming process are ensured. In general, the elastic force of the first elastic member 3 is greater than that of the third elastic member 5.

The first elastic member 3 comprises a first guide rod 31, a first compression spring 32 and a first limiting block 33, a first guide hole 124 communicated with the upper die cavity 122 is formed in the upper die body 12, the first guide rod 31 penetrates through the first guide hole 124, the lower end of the first guide rod 31 is connected with the upper surface of the forming head 13, the first limiting block 33 is mounted at the upper end of the first guide rod 31, and the first limiting block 33 is in snap fit with the edge of the upper end opening of the first guide hole 124; the first compression spring 32 is sleeved on the first guide rod 31, the upper end of the first compression spring 32 is in contact fit with the bottom of the upper die cavity 122, and the lower end of the first compression spring 32 is in contact fit with the upper surface of the forming head 13. When the upper die 1 and the lower die 2 are in the die-closing state, the forming head 13 and the bottom bracket 23 can not move downwards any more, at this time, the upper die body 12 continues to move downwards along the forming head 13, and the first compression spring 32 is compressed, so that the lower end surface of the upper die body 12 moves downwards and contacts and cooperates with the upper surface of the edge rolling plate 24. When the upper die 1 and the lower die 2 are in the die opening state, the first compression spring 32 is reset to restore a certain length, so that the upper die body 12 moves upwards along the first guide rod 31, but under the limiting action of the first limiting block 33, the first compression spring 32 is limited to continue to lengthen, so that the upper die body 12 cannot continue to move upwards.

The upper surface of the forming head 13 is provided with a first limiting hole 132 corresponding to the first guiding 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 restrained in the first restraining hole 132, so that the first compression spring 32 is more stable when expanding and contracting.

The third elastic member 5 comprises a first air cylinder 51, a third guide rod 52, a third limiting block 53 and a third compression spring 54, a third guide hole 243 which penetrates up and down is formed in the hemming plate 24, a fourth guide hole 225 corresponding to the third guide hole 243 is formed in the lower die body 22, the first air cylinder 51 is mounted on the lower die holder 21, a piston rod of the first air cylinder 51 extends upwards, the third guide rod 52 is positioned in the fourth guide hole 225 and the third guide hole 243, and the third limiting block 53 is mounted on the upper end of the third guide rod 52 and is in snap fit with the edge of an upper end opening in the third guide hole 243; the lower end of the third guide rod 52 is connected with the tail end of the piston rod of the first cylinder 51; the third compression spring 54 is sleeved on the third guide rod 52, the upper end of the third compression spring 54 is in contact fit with the lower surface of the edge rolling plate 24, and the lower end of the third compression spring 54 is in contact fit with the upper surface of the lower die body 22. After the hemming is completed, the upper die 1 is driven to be lifted upwards by the die clamping driving mechanism, and the forming head 13 continues to be pulled downwards under the reset action of the first compression spring 32, so that if the material rolling plate moves upwards due to up-and-down expansion at the moment, the curled edge of the opening of the semi-finished paper box is loosened; at this time, the first cylinder 51 of the lower die body 22 contracts to pull the third guide rod 52, so that the third compression spring 54 on the third guide rod 52 does not rebound and returns to the original position temporarily, and further, the edge rolling plate 24 is pulled to move upwards, until the upper die 1 is completely opened, the bottom support 23 extends upwards and is positioned above the forming cavity 223 under the rebound and return action of the second elastic member 4, so that the finished paper box is ejected upwards, after the finished paper box is ejected, the first cylinder 51 of the lower die body 22 extends, the third guide rod 52 and the edge rolling plate 24 connected with the third guide rod are released, and the edge rolling plate 24 returns to the original position under the rebound action of the third compression spring 54.

The second elastic member 4 comprises a second guide rod 41, a second compression spring 42 and a second limiting block 43, a second guide hole 226 communicated with the lower die cavity 224 is formed in the lower die body 22, the second guide rod 41 passes through the second guide hole 226, the upper end of the second guide rod 41 is connected with the lower surface of the bottom support 23, the second limiting block 43 is mounted at the lower end of the second guide rod 41, and the second limiting block 43 is in snap fit with the edge of the lower end opening of the second guide hole 226; the second compression spring 42 is sleeved on the second guide rod 41, the upper end of the second compression spring 42 is in contact fit with the upper surface of the bottom bracket 23, and the lower end of the second compression spring 42 is in contact fit with the bottom of the lower die cavity 224. When the upper die 1 and the lower die 2 are in the process of die assembly, the forming head 13 and the shoe 23 can not move downwards any more, at this time, the second compression spring 42 is compressed in the lower die cavity 224, and the second guide rod 41 moves downwards along the second guide hole 226 to drive the shoe 23 to move downwards until the shoe 23 is blocked by the lower die cavity 224 and can not move downwards any more. When the upper die 1 and the lower die 2 are opened, the second compression spring 42 is reset to restore a certain length, so that the second guide rod 41 moves upwards along the second guide hole 226 to drive the shoe 23 to move upwards, but the second compression spring 42 is limited to continue to lengthen under the limiting action of the second limiting block 43, so that the shoe 23 cannot continue to move upwards. In a more preferred embodiment, the second guide hole 226 is a counter bore.

Two blocking blocks 227 are arranged on the lower die body 22 in an opposite mode, and the two blocking blocks 227 are positioned on the outer side of the hemming plate 24; when the upper die 1 and the lower die 2 are in the open state, the upper surface of the stopper 227 is higher than the upper surface of the hemming plate 24. To address the sequence of folding the carton, when two opposite sides of the carton are brought into contact with the two opposing stops 227, the two opposite sides of the carton are folded inwardly in advance, and as the upper die body 12 continues to move downwardly, the shoe 23 is retracted downwardly into the lower die cavity 224 so that the other two opposite sides of the carton are brought into contact with the upper surface of the hemming plate 24 (i.e., the upper end opening edge of the guide through hole 241), and the other two opposite sides of the carton are then folded naturally inwardly as well.

The cross-sectional area of the lower portion 136 of the forming head 13 is gradually reduced from top to bottom, and the cross-sectional area of the forming cavity 223 is gradually reduced from top to bottom. With this arrangement, the lower portion 136 of the forming head 13 mates with the forming cavity 223 when the lower portion 136 of the forming head 13 is in the forming cavity 223.

The hemming plate 24 has a hemming heating tube 244 provided therein. The hemming plate 24 is heated by the hemming heating tube 244, and when the opening edge of the semi-finished paper box is gradually inserted upward into the annular hemming groove 6, the heating of the hemming plate 24 can further accelerate the opening edge of the semi-finished paper box to be gradually bent outward.

The upper surface of the bottom support 23 is provided with a second boss 231 protruding upwards, the lower surface of the forming head 13 is provided with a pressing mold groove 133 with a downward opening, and the pressing mold groove 133 is correspondingly matched with the second boss 231; when the upper die 1 and the lower die 2 are in the die-closing state, the second boss 231 is in the die-pressing groove 133.

In general, the upper die holder 11 is connected to a power output end of the mold clamping driving mechanism, and the mold clamping driving mechanism may be a cylinder or an oil cylinder, or may be a motor or a transmission link.

Example 2

As shown in fig. 10 to 11, the carton folding hemming forming die in this embodiment is different from embodiment 1 in that:

The inside of the upper die body 12 is provided with a second air cylinder 125, the extending direction of a piston rod of the second air cylinder 125 is downward, the inside of the upper die body 12 is provided with a fifth guide hole 126 communicated with the upper die cavity 122, the piston rod of the second air cylinder 125 passes through the fifth guide hole 126 and enables the tail end of the piston rod of the second air cylinder 125 to be positioned in the upper die cavity 122, the upper surface of the forming head 13 is connected with the tail end of the piston rod of the second air cylinder 125, the inside of the forming head 13 is provided with an air channel 134 connected with external adsorption equipment, and the lower surface of the forming head 13 is provided with a plurality of air suction holes 135 communicated with the air channel 134. With this arrangement, the molding head 13 can be vertically extended and contracted in the upper cavity 122. When the upper die 1 and the lower die 2 are opened, external adsorption equipment is started, the air passage 134 of the forming head 13 is vacuumized, negative pressure areas are formed at the air suction holes 135, curled paper boxes are adsorbed by the forming head 13, the second air cylinder 125 is contracted upwards, the forming head 13 and the adsorbed paper boxes are driven to move upwards, and the phenomenon that the rolled edges of the opening of the semi-finished paper boxes are loosened due to upward movement of a coiling plate is avoided.

The third elastic piece 5 comprises a third guide rod 52, a third limiting block 53 and a third compression spring 54, a third guide hole 243 which penetrates up and down is arranged in the hemming plate 24, the third guide rod 52 is positioned in the third guide hole 243, and the third limiting block 53 is arranged on the upper end of the third guide rod 52 and is in snap fit with the edge of the upper end opening in the third guide hole 243; the lower end of the third guide rod 52 is connected with the upper surface of the lower die body 22; the third compression spring 54 is sleeved on the third guide rod 52, the upper end of the third compression spring 54 is in contact fit with the lower surface of the edge rolling plate 24, and the lower end of the third compression spring 54 is in contact fit with the upper surface of the lower die body 22. When the upper die 1 and the lower die 2 are in the die-closing state, the forming head 13 and the shoe 23 can not move downward any more, at this time, the upper die body 12 continues to move downward along the forming head 13, and the third compression spring 54 is compressed, so that the hemming plate 24 moves downward along the outer wall of the first boss 222. When the upper die 1 and the lower die 2 are in the open state, the third compression spring 54 is reset to restore a certain length, so that the hemming plate 24 moves upwards along the outer wall of the first boss 222, but under the limiting action of the third limiting block 53, the third compression spring 54 is limited to continue to lengthen, so that the hemming plate 24 cannot continue to move upwards. In a more preferred embodiment, the third guiding hole 243 is a counter bore.

The upper surface of the lower die body 22 is provided with a third limiting hole 228 corresponding to the third guiding 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 restrained in the third restraining hole 228, so that the third compression spring 54 is more stable when expanding and contracting.

In addition, it should be noted that, in the specific embodiments described in the present specification, names of various parts and the like may be different, and all equivalent or simple changes of the structures, features and principles described in the conception of the present utility model are included in the protection scope of the present utility model. Those skilled in the art may make various modifications or additions to the described embodiments or substitutions in a similar manner without departing from the scope of the utility model as defined in the accompanying claims.

Claims (10)

1. The paper box folding and hemming forming die comprises an upper die, a lower die and a die clamping driving mechanism capable of driving the upper die and the lower die to open and close, wherein the upper die comprises an upper die seat, an upper die body and a forming head, the upper die body is arranged on the upper die seat, and an upper heating pipe is arranged in the upper die body; the lower die comprises a lower die seat, a lower die body and a bottom bracket, wherein the lower die body is arranged on the lower die seat, and a lower heating pipe is arranged in the lower die body; the method is characterized in that: the lower part of the upper die body is provided with an upper die cavity with a downward opening, the forming head is arranged in the upper die cavity through a first elastic piece, and the depth of the upper die cavity is the same as the height of the upper part of the forming head; the upper surface of the lower die body is provided with a first boss protruding upwards, a forming cavity with an upward opening is arranged in the first boss, a lower die cavity is arranged in the lower die body, the lower die cavity is positioned below the forming cavity and is communicated with the forming cavity, the lower part of the forming head is matched with the forming cavity, and the collet is arranged in the lower die cavity through a second elastic piece; the lower die further comprises a hemming plate, a guide through hole corresponding to the first boss is formed in the center of the hemming plate, the hemming plate is sleeved on the first boss through the guide through hole, the hemming plate is mounted on the lower die body through a third elastic piece, the height of the hemming plate is larger than that of the first boss, and the upper portion of the forming head is matched with the guide through hole; a lower annular hemming groove with an upward opening is arranged on the upper end opening edge of the guide through hole, an upper annular hemming groove with a downward opening is arranged on the lower end opening edge of the upper die cavity, and the upper annular hemming groove is correspondingly matched with the lower annular hemming groove; when the upper die and the lower die are in an open die state, the upper surface of the bottom support is higher than the upper surface of the hemming plate, and the upper surface of the hemming plate is higher than the upper end opening edge of the forming cavity; when the upper die and the lower die are in the die assembly process, an annular gap for the paper board to pass through is formed between the upper part of the forming head and the inner wall of the guide through hole, the lower end face of the upper die body is in contact fit with the upper surface of the edge rolling plate, and the annular gap is communicated with the upper annular edge rolling groove.

2. The carton folding hemming forming die of claim 1 wherein: the elastic force of the first elastic piece is larger than that of the second elastic piece, and the elastic force of the third elastic piece is larger than that of the second elastic piece.

3. A carton folding hemming forming die as claimed in claim 1 or claim 2 wherein: the first elastic piece comprises a first guide rod, a first compression spring and a first limiting block, a first guide hole communicated with the upper die cavity is formed in the upper die body, the first guide rod penetrates through the first guide hole, the lower end of the first guide rod is connected with the upper surface of the forming head, the first limiting block is arranged at the upper end of the first guide rod, and the first limiting block is in snap fit with the edge of the opening at the upper end of the first guide hole; the first compression spring is sleeved on the first guide rod, the upper end of the first compression spring is in contact fit with the bottom of the upper die cavity, and the lower end of the first compression spring is in contact fit with the upper surface of the forming head.

4. A carton folding hemming die as claimed in claim 3 wherein: 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 positioned in the first limiting hole.

5. A carton folding hemming die as claimed in claim 3 wherein: the third elastic piece comprises a first air cylinder, a third guide rod, a third limiting block and a third compression spring, a third guide hole which is vertically communicated is formed in the hemming plate, a fourth guide hole corresponding to the third guide hole is formed in the lower die body, the first air cylinder is installed on the lower die base, a piston rod of the first air cylinder extends upwards, the third guide rod is positioned in the fourth guide hole and the third guide hole, and the third limiting block is installed at the upper end of the third guide rod and is in snap fit with the edge of an opening at the upper end in the third guide hole; the lower end of the third guide rod is connected with the tail end of a piston rod of the first cylinder; the third compression spring is sleeved on the third guide rod, the upper end of the third compression spring is in contact fit with the lower surface of the hemming plate, and the lower end of the third compression spring is in contact fit with the upper surface of the lower die body.

6. A carton folding hemming forming die as claimed in claim 1 or claim 2 wherein: the inside of last die body is equipped with the second cylinder, and the piston rod direction of stretching out of second cylinder is equipped with the communicating fifth guiding hole of upper die cavity down, the piston rod of second cylinder pass the fifth guiding hole and make the piston rod end of second cylinder be in the upper die cavity, the upper surface of shaping head and the piston rod end-to-end connection of second cylinder, the inside of shaping head is equipped with the air flue of being connected with external adsorption equipment, is equipped with a plurality of inhalation ports with air flue intercommunication on the lower surface of shaping head.

7. The carton folding hemming forming die of claim 6 wherein: the third elastic piece comprises a third guide rod, a third limiting block and a third compression spring, a third guide hole which is vertically penetrated is formed in the hemming plate, the third guide rod is positioned in the third guide hole, and the third limiting block is arranged at the upper end of the third guide rod and is in snap fit with the edge of an opening at the upper end in the third guide hole; the lower end of the third guide rod is connected with the upper surface of the lower die body; the third compression spring is sleeved on the third guide rod, the upper end of the third compression spring is in contact fit with the lower surface of the hemming plate, and the lower end of the third compression spring is in contact fit with the upper surface of the lower die body.

8. The carton folding hemming forming die of claim 1 wherein: the second elastic piece comprises a second guide rod, a second compression spring and a second limiting block, a second guide hole communicated with the lower die cavity is formed in the lower die body, the second guide rod penetrates through the second guide hole, the upper end of the second guide rod is connected with the lower surface of the bottom bracket, the second limiting block is arranged at the lower end of the second guide rod, and the second limiting block is in snap fit with the edge of the opening of the lower end of the second guide hole; the second compression spring is sleeved on the second guide rod, the upper end of the second compression spring is in contact fit with the upper surface of the bottom bracket, and the lower end of the second compression spring is in contact fit with the bottom of the lower die cavity.

9. The carton folding hemming forming die of claim 1 wherein: two blocking blocks which are oppositely arranged are arranged on the lower die body, and the two blocking blocks are positioned on the outer side of the edge rolling plate; when the upper die and the lower die are in the die opening state, the upper surface of the baffle block is higher than the upper surface of the hemming plate.

10. The carton folding hemming forming die of claim 1 wherein:

a hemming heating pipe is arranged in the hemming plate;

The sectional area of the lower part of the forming head gradually becomes smaller from top to bottom, and the sectional area of the forming cavity gradually becomes smaller from top to bottom;

The upper surface of the bottom support is provided with a second boss protruding upwards, the lower surface of the forming head is provided with a pressing die groove with a downward opening, and the pressing die groove is correspondingly matched with the second boss; when the upper die and the lower die are in a die clamping state, the second boss is positioned in the die pressing groove.