Telescopic hemming internal expansion device, hemming equipment and hemming method

Abstract

The present invention relates to a telescopic hemming device, hemming equipment and hemming method for a pulp molded container cover. It solves the defects of the prior art such as unreasonable design. The telescopic hemming device for the pulp molded container cover includes: a fixed air supply seat; a rotating shaft in an upright state; the rotating shaft passes through the fixed air supply seat and the rotating shaft can rotate relative to the fixed air supply seat; a hemming positioning seat fixed to the top of the rotating shaft; a plurality of telescopic hemming blocks; the telescopic hemming blocks are evenly distributed in a circle with the axis of the hemming positioning seat, and the telescopic hemming blocks translate on a plane perpendicular to the axis of the hemming positioning seat. The advantages of the present application are: the pulp container cover after hemming processing can be quickly removed and the inner diameter of the inner convex part will not expand during the removal process, ultimately ensuring the sealing of the pulp molded cover on the cup.

Description

Technical Field

[0001] The invention belongs to the technical field of pulp molded cup cover processing, and in particular relates to a telescopic hemming inner expansion device, hemming equipment and hemming method for a pulp molded container cover. Background Art

[0002] The pulp molded cup cover is used to cover the cup to seal it.

[0003] In the existing pulp molded cup cover processing process, some inventors have designed inner convex buckles on the inner wall of the side wing of the cup cover. The inner convex buckles are formed by integral molding during the manufacture of the pulp molded cup cover or by subsequent rolling molding.

[0004] For example, a Chinese patent discloses a servo forming device for controlling the feeding of pulp cup lid ring buckles, patent number CN201922057581.3, including a workbench, on which one or more main wheel assemblies, one or more pressing assemblies cooperating with the main wheel assembly, and one or more secondary wheel assemblies are arranged, the pressing assemblies are arranged above the main wheel assembly by a supporting cantilever mounted on the workbench, the main wheel assembly includes a servo motor, a rotating main shaft, and a pressing main wheel, the pressing assemblies include a pressing drive mechanism and a pressing block, the pressing block is connected and driven by the pressing drive mechanism, the secondary wheel assembly includes a translation drive mechanism, a pressing secondary wheel driven by the translation drive mechanism to form a ring buckle close to the side of the cup lid blank, the translation drive mechanism is provided with a torque sensor that can detect the torque of the pressing secondary wheel extruding the side of the cup lid blank, the servo proportional valve is connected to a controller, the controller is connected to the torque sensor and controls the operation of the servo proportional valve according to the detection data of the torque sensor.

[0005] The above scheme is to use pulp molded cup lids to be further rolled after being processed and formed. The above scheme has the following disadvantages:

[0006] Since the side wings of the cup lid are rolled to form an inner convex portion, when the robot removes the cup lid, the inner diameter of the inner convex portion will expand radially during the upward removal process, which makes it difficult for the robot to pick up the material. At the same time, the inner convex portion of the cup lid is radially expanded, resulting in a decrease in subsequent sealing performance, and the design is unreasonable. Summary of the invention

[0007] The purpose of the present invention is to provide a telescopic hemming device, hemming equipment and hemming method for a pulp molded container cover that can solve the above technical problems.

[0008] In order to achieve the above object, the present invention adopts the following technical solutions:

[0009] The telescopic hemming inner expansion device of the pulp molding container cover comprises:

[0010] Fixed air supply seat;

[0011] A rotating shaft is in an upright state; the rotating shaft passes through the fixed air supply seat and the rotating shaft can rotate relative to the fixed air supply seat;

[0012] A rolling locating seat, fixed on the top of the rotating shaft;

[0013] There are several telescopic inner expansion blocks; the telescopic inner expansion blocks are evenly distributed in a circle around the axis of the roll edge positioning seat, and the telescopic inner expansion blocks translate on a plane perpendicular to the axis of the roll edge positioning seat;

[0014] The pneumatic drive mechanism includes at least one first air circuit arranged on the fixed air supply seat, and at least one second air circuit arranged on the rolling positioning seat. Each of the first air circuit and the second air circuit is connected and drives the telescopic inner expansion block to translate on a plane perpendicular to the axis of the rolling positioning seat through gas.

[0015] In the above-mentioned telescopic rolling inner expansion device for the pulp molded container cover, there are four telescopic inner expansion blocks, two first gas circuits, two second gas circuits, and the gas supplied by each of the second gas circuits drives two of the four telescopic inner expansion blocks to translate on a plane perpendicular to the axial centerline of the rolling positioning seat.

[0016] In the above-mentioned telescopic rolling and internal expansion device of the pulp molded container cover, a centering sleeve is provided on the top of the fixed air supply seat and is rotatably pressed against the fixed air supply seat, a third air path connected to the first air path is provided in the centering sleeve, a third air nozzle connected to the third air path is provided on the outer peripheral surface of the centering sleeve, and a second air nozzle connected to the second air path is provided on the outer peripheral surface of the rolling positioning seat, and one of the third air nozzles and one of the second air nozzles are connected via an air guide pipe.

[0017] In the telescopic hemming device for the cover of a pulp molded container, a flange is provided on the top of the rotating shaft, the hemming positioning seat is fixed to the upper surface of the flange, and the centering spacer is fixed to the lower surface of the flange.

[0018] In the telescopic hemming and inner expansion device of the above-mentioned pulp molded container cover, a plurality of cylindrical locating pins are provided on the flange, and a plurality of radial grooves are provided on the cross section of the centering spacer. The inner groove wall of the radial groove is a circular arc groove surface. The cylindrical locating pin is inserted into the radial groove and a partial cylindrical surface of the cylindrical locating pin matches and fits the circular arc groove surface.

[0019] In the telescopic rolling and internal expansion device of the above-mentioned pulp molded container cover, a plurality of radial slide grooves are provided on the top of the rolling positioning seat, and a sliding block is provided on the lower surface of each of the telescopic internal expansion blocks. The sliding block is movably installed in the radial slide groove, and a closed air chamber is provided between the lower surface of the sliding block and the bottom of the radial slide groove, and the second air path is connected to at least one of the closed air chambers.

[0020] The present application also provides a multi-station hemming device for a pulp molded container cover, comprising a fixed frame, on which a plurality of telescopic hemming inner expansion devices for the pulp molded container cover are rotatably arranged.

[0021] In the above-mentioned multi-station rolling device for pulp molded container cover, the device also includes an elastic downward pressing device located above the telescopic rolling inner expansion device of the pulp molded container cover, and also includes a rolling device located on the side of the telescopic rolling inner expansion device of the pulp molded container cover.

[0022] In the above-mentioned multi-station hemming device for pulp molded container covers, there are eight telescopic hemming inner expansion devices for the pulp molded container covers, and the telescopic hemming inner expansion devices for the pulp molded container covers rotate synchronously in the same direction, there are eight elastic downward pressing devices, and the eight elastic downward pressing devices are arranged on a lifting frame, and the lifting frame is connected to the lifting drive.

[0023] In the above-mentioned multi-station hemming device for pulp molded container covers, the eight telescopic hemming inner expansion devices of the pulp molded container covers are distributed in three rows, wherein the number of telescopic hemming inner expansion devices of the pulp molded container covers in the middle row is less than that in the other two rows, and the number of telescopic hemming inner expansion devices of the pulp molded container covers in the other two rows is equal;

[0024] There are eight rolling devices, which are distributed in three rows. The two rolling devices located in the middle are in the same straight line as the telescopic rolling inner expansion devices of the pulp molded container covers in the middle row, and the rolling devices in the remaining two rows are located one by one on the outside of the telescopic rolling inner expansion devices of the pulp molded container covers in the corresponding rows.

[0025] In the above-mentioned multi-station hemming equipment for pulp molded container covers, the two hemming devices in the center row move relative to each other or move away from each other; and the hemming devices in the remaining two rows move relative to each other or move away from each other.

[0026] In the above-mentioned multi-station hemming equipment for pulp molded container covers, the hemming device comprises a translation seat and a hemming wheel arranged on the translation seat.

[0027] The present application also provides a method for rolling a pulp molded container cover, using the multi-station rolling device for the pulp molded container cover, and the rolling method comprises the following steps:

[0028] S1. Place the cover, and put the cover of the pulp molded container to be rolled with the cover opening facing downward on the telescopic inner expansion blocks gathered together;

[0029] S2, tightening, the telescopic inner expansion block is radially translated outward along the axis of the rolling edge positioning seat, so that the outer peripheral surface of the telescopic inner expansion block abuts against the inner wall of the pulp molded container cover, and in the process of the telescopic inner expansion block abutting against the inner wall of the pulp molded container cover, the elastic downward pressure device presses down on the top surface of the pulp molded container cover;

[0030] S3, rolling, the rolling device is driven by the translation driving force to approach the corresponding pulp molded container cover, the rotation direction of the pulp molded container cover is opposite to the rotation direction of the rolling device, that is, rolling and pressing the inner convex part on the inner wall of the pulp molded container cover;

[0031] S4, removing the cover, the telescopic inner expansion block is radially translated inward along the axis of the rolling edge positioning seat, so that a gap is formed between the inner wall of the inner convex part and the outer peripheral surface of the telescopic inner expansion block, and then the pulp molded container cover is removed.

[0032] Compared with the existing technology, the advantages of this application are:

[0033] An inward-expanding telescopic structure is adopted. When the telescopic inner expansion blocks converge, the pulp molded container cover is directly put on the converged telescopic inner expansion blocks, and then expands radially outward and inward on the inner wall of the pulp molded container cover. When the rolling process is completed, the telescopic inner expansion blocks converge radially inward. At this time, the outer peripheral surface of the telescopic inner expansion block and the inner wall of the processed pulp molded container cover form a gap greater than or equal to the inner diameter of the inner convex part, so that the pulp molded container cover after the rolling process can be quickly removed and the inner diameter of the inner convex part will not expand during the removal process, ultimately ensuring the sealing of the pulp molded cover on the cup, and the anti-slip performance is further improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 The invention is a schematic diagram of the three-dimensional structure of a telescopic hemming inner expansion device for a pulp molded container cover provided by the present invention.

[0035] Figure 2 It is a structural schematic diagram of a fixed air supply seat combined with a centering spacer provided by the present invention.

[0036] Figure 3 It is a schematic diagram of the rotating shaft structure provided by the present invention.

[0037] Figure 4 It is a structural schematic diagram of the hemming positioning seat provided by the present invention.

[0038] Figure 5 It is a structural schematic diagram of the hemming positioning seat provided by the present invention from another viewing angle.

[0039] Figure 6 It is a schematic diagram of a partial cross-sectional structure of a roll edge positioning seat provided by the present invention.

[0040] Figure 7 It is a schematic structural diagram of the eight-station internal expansion device provided by the present invention.

[0041] Figure 8 It is a structural schematic diagram of embodiment 2 provided by the present invention.

[0042] Fig. 9 yes Figure 8 Schematic diagram of the local explosion structure.

[0043] Fig.10 It is a schematic diagram of the container cover structure after the hemming provided by the present invention.

[0044] Fig.11 It is a simplified structural schematic diagram of the air-driven hemming device provided by the present invention.

[0045] Fig.12 It is a flowchart of the hemming method provided by the present invention.

[0046] In the figure, a telescopic hemming and internal expansion device A for a pulp molded container cover, a fixed air supply seat 1, a flat bottom depression 10, a first air nozzle 11, a rotating shaft 2, a flange 20, a through groove 200, an upper convex portion 201, a cylindrical positioning pin 21, a hemming and positioning seat 3, a second air nozzle 30, a radial slide groove 31, a sliding block 32, a closed air chamber 33, a telescopic internal expansion block 4, a ventilation air pipe 40, a centering spacer 5, a third air nozzle 50, a radial groove 51, an arc groove surface 52, a fixed frame 6, a servo motor 7, a device body 8, a cantilever frame 80, an elastic downward pressing device B, a lifting frame B0, a lifting drive B01, a pressing block B1, a connecting shaft B2, an anti-drop cap B3, a spring B4, a hemming device C, a hemming wheel C3, and a translation seat C4. DETAILED DESCRIPTION

[0047] The following are specific embodiments of the invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments. Embodiment 1

[0048] like Figure 1 As shown, the telescopic hemming inner expansion device of the pulp molded container cover comprises a fixed air supply seat 1, a rotating shaft 2, a hemming positioning seat 3, a telescopic inner expansion block 4 and a pneumatic drive mechanism. The outer contour of the telescopic inner expansion block 4 imitates the inner wall shape of the pulp molded container cover. The outer arc circumference of the telescopic inner expansion block 4 is provided with an inner concave molding groove for molding the inner convex part of the container cover.

[0049] The fixed air supply seat 1 of this embodiment is cylindrical to facilitate the penetration of the rotating shaft 2.

[0050] The rotating shaft 2 is in an upright state; the rotating shaft 2 penetrates the fixed air supply seat 1 and the rotating shaft 2 can rotate relative to the fixed air supply seat 1. The rotating shaft 2 and the fixed air supply seat 1 are matched with a small gap so that the rotating shaft can rotate freely.

[0051] The upper end of the rotating shaft 2 extends above the upper end of the fixed air supply seat 1 , and the lower end of the rotating shaft 2 extends below the lower end of the fixed air supply seat 1 .

[0052] The hemming positioning seat 3 is fixed on the top of the rotating shaft 2. The hemming positioning seat 3 rotates with the rotating shaft 2 to facilitate hemming processing.

[0053] Several telescopic inner expansion blocks 4 are evenly distributed in a circle with the axis of the rolling edge positioning seat 3, and the telescopic inner expansion block 4 translates on a plane perpendicular to the axis of the rolling edge positioning seat 3.

[0054] The telescopic inner expansion block 4 converges toward the axis of the hemming positioning seat 3 and surrounds to form a ring, and moves outward to expand the inner wall of the pulp molding container cover.

[0055] The pneumatic drive mechanism includes at least one first air circuit arranged on the fixed air supply seat 1, and at least one second air circuit arranged on the rolling positioning seat 3. Each first air circuit is connected to a second air circuit and drives the telescopic inner expansion block 4 to translate on a plane perpendicular to the axis of the rolling positioning seat 3 through gas.

[0056] The present embodiment adopts an inward expansion telescopic structure. When the telescopic inner expansion blocks 4 converge, the pulp molded container cover is directly put on the converged telescopic inner expansion blocks 4, and then expands radially outward and inward on the inner wall of the pulp molded container cover. When the rolling process is completed, the telescopic inner expansion blocks 4 converge radially inward. At this time, the outer peripheral surface of the telescopic inner expansion block 4 and the processed inner wall of the pulp molded container cover form a gap greater than or equal to the inner diameter of the inner convex part, so that the pulp molded container cover after the rolling process can be quickly removed and the inner diameter of the inner convex part will not expand during the removal process, ultimately ensuring the sealing of the pulp molded cover on the cup, and the anti-slip performance is further improved.

[0057] Secondly, the above method can also improve the qualified rate of the hemming processing of the pulp molded container cover and significantly reduce the scrap rate.

[0058] In addition, the inner expansion method of the present application can make the inner convex height of the inner convex part of the pulp molded container cover uniform after the hemming process. In contrast, in the background technology, due to the clearance fit between the cup cover and the lower mold, the rolling of the roller applies radial force to the cup cover in the circumferential direction. Due to the low structural strength of the cup cover itself, the inner convex height of the inner convex part will be inconsistent during the rolling process, which is not conducive to sealing.

[0059] like Fig.11 As shown, in this embodiment, there are 2-4 telescopic inner expansion blocks 4. In a preferred embodiment, there are four telescopic inner expansion blocks 4, and there are two first gas circuits and two second gas circuits. The gas supplied by each second gas circuit drives two of the four telescopic inner expansion blocks 4 to translate on a plane perpendicular to the axis of the rolling positioning seat 3.

[0060] Furthermore, if Figure 1-Figure 6 and Fig.11 As shown, a centering spacer 5 which rotates against the fixed air supply seat 1 is provided on the top of the fixed air supply seat 1, a third air path connected to the first air path is provided in the centering spacer 5, a third air nozzle 50 connected to the third air path is provided on the outer peripheral surface of the centering spacer 5, and a second air nozzle 30 connected to the second air path is provided on the outer peripheral surface of the rolling positioning seat 3, and a third air nozzle 50 and a second air nozzle 30 are connected through a conductive air pipe 40.

[0061] Specifically, a flange 20 is provided on the top of the rotating shaft 2, the roll edge positioning seat 3 is fixed on the upper surface of the flange 20, and the centering spacer 5 is fixed on the lower surface of the flange 20. In addition, a plurality of cylindrical positioning pins 21 are provided on the flange 20, and a plurality of radial grooves 51 are provided on the cross section of the centering spacer 5. The inner groove wall of the radial groove 51 is a circular arc groove surface 52. The cylindrical positioning pin 21 is inserted into the radial groove 51, and the part of the cylindrical surface of the cylindrical positioning pin 21 matches the circular arc groove surface. The outer side of the radial groove 51 is connected to the outside.

[0062] The radial groove 51 on the centering sleeve 5 cooperates with the cylindrical positioning pin 21 so that the axis line of the centering sleeve 5 coincides with the axis line of the rotating shaft 2, so that the third air path in the centering sleeve 5 and the first air path are connected without eccentricity, ensuring the smoothness of the airflow and the stability and smoothness of the rotation of the rotating shaft.

[0063] Secondly, a flat-bottomed depression 10 is provided at the bottom of the rolling edge positioning seat 3, an upper protrusion 201 matching the flat-bottomed depression 10 is provided on the flange 20, a through groove 200 is provided on the upper surface of the flange 20, the upper end surface of the cylindrical positioning pin 21 is a plane, and the upper end of the cylindrical positioning pin 21 extends out of the through groove 200 and abuts against the bottom plane of the flat-bottomed depression 10.

[0064] like Figure 1-Figure 6 and Fig.11As shown, a plurality of radial grooves 31 are provided on the top of the rolling positioning seat 3, and a sliding block 32 is provided on the lower surface of each telescopic inner expansion block 4. The sliding block 32 is movably installed in the radial groove 31, and a closed air chamber 33 is provided between the lower surface of the sliding block 32 and the bottom of the radial groove 31, and the second air path is connected to at least one closed air chamber 33. The telescopic inner expansion block 4 is any one of a fan-shaped block or a semicircular block, and its shape is determined according to the total number of designs. When there are four telescopic inner expansion blocks 4, the second air path is designed as two paths, both of which are annular structures and the two second air paths are not connected to each other, and one second air path is connected to two closed air chambers 33. When the external air pressure enters the closed air chamber 33, the telescopic inner expansion block 4 moves radially outward due to the action of the air pressure. How to achieve reset can be achieved by designing a reset spring (not shown in the figure) at the outer end or both sides of the telescopic inner expansion block 4 to achieve reset.

[0065] The first air path is an annular structure, and the first air path is arranged on the top surface of the fixed air supply seat 1. The number of the first air paths is set according to the number of the telescopic inner expansion blocks 4. Taking the above-mentioned four telescopic inner expansion blocks 4 as an example, the first air paths at this time are distributed in two ways inside and outside and are different from each other. Each first air path is connected to the first air nozzle 11 respectively, and the two third air paths arranged inside the centering spacer 5 are in a large and a small annular structure. A third air path is connected to a first air path. Regarding the connection method here, a number of connecting holes distributed circumferentially and distributed along the axial direction of the centering spacer 5 are provided on the wall thickness of the lower end of the centering spacer 5. There are two circles of connecting holes distributed inside and outside, and each circle has a number of connecting holes. Each circle of connecting holes connects a third air path with a first air path.

[0066] The lower end surface of the centering spacer 5 is sealed with the upper end surface of the fixed air supply seat 1, which can be hard sealed, soft sealed, or a combination of hard and soft sealed. The soft seal is a sealing ring. Embodiment 2

[0067] like Figure 7-Figure 9 As shown, this embodiment provides a multi-station hemming device for pulp molded container covers, including a fixed frame 6, and a telescopic hemming inner expansion device A for pulp molded container covers of the first embodiment rotatably arranged on the fixed frame 6.

[0068] The fixing frame 6 is fixed on the device body 8 .

[0069] In order to ensure that the rolling edge does not jump up, the equipment of this embodiment also includes an elastic downward pressing device B located above the telescopic rolling edge expansion device of the pulp molding container cover, and also includes a rolling edge device C located on the side of the telescopic rolling edge expansion device A of the pulp molding container cover.

[0070] The number of the elastic pressing devices B and the number of the hemming devices C are set according to the number of the telescopic hemming inner expansion devices A of the pulp molded container cover.

[0071] This embodiment takes eight as an example, that is, there are eight telescopic hemming and inner expansion devices A of the pulp molded container cover and the telescopic hemming and inner expansion devices A of the pulp molded container cover rotate synchronously in the same direction to achieve synchronous and same-direction rotation, and adopts a transmission method in which the same synchronous belt is engaged with the lower end of the rotating shaft, and the synchronous belt is driven by a servo motor 7.

[0072] There are eight elastic pressing devices B, which are arranged on a lifting frame B0, and the lifting frame B0 is connected to a lifting driver B01. The lifting driver B01 is any one of an air cylinder, an oil cylinder and a linear motor.

[0073] like Figure 7-Figure 9 As shown, each elastic downward pressing device B comprises a pressing block B1, and a flexible sheet is arranged on the lower surface of the pressing block B1, and the flexible sheet is, for example, sponge or silica gel, etc. A connecting shaft B2 is arranged at the center of the upper surface of the pressing block B1, and the upper end of the connecting shaft B2 is penetrated through the shaft hole of the lifting frame B0, and an anti-drop cap B3 is sleeved on the upper end of the connecting shaft B2, and the anti-drop cap B3 fits the upper surface of the lifting frame B0, and a spring B4 is sleeved on the connecting shaft B2, and the lower end of the spring B4 acts on the upper surface of the pressing block B1, and the upper end of the spring B4 acts on the lower surface of the lifting frame B0.

[0074] The lifting driver B01 is fixed on the cantilever frame 80 of the equipment body 8, and the hemming device C is arranged on the equipment body 8, that is, a platform is provided on the equipment body 8, and the hemming device C and the fixing frame 6 are respectively arranged on the platform.

[0075] In order to make the layout more reasonable, the telescopic curling and expansion devices A of the eight pulp molded container covers of the present embodiment are distributed in three rows, wherein the number of telescopic curling and expansion devices A in the middle row of pulp molded container covers is less than that in the other two rows, and the number of telescopic curling and expansion devices A in the other two rows of pulp molded container covers is equal; that is, the number in the middle row is two, and the number in the other two rows is three respectively.

[0076] There are eight hemming devices C, which are distributed in three rows. The two hemming devices C located in the middle are in the same straight line as the telescopic hemming inner expansion devices A of the pulp molded container covers in the middle row, and the remaining two rows of hemming devices C are located one by one on the outside of the telescopic hemming inner expansion devices A of the pulp molded container covers in the corresponding rows.

[0077] The two hemming devices C in the middle row move relative to each other or move away from each other; the hemming devices C in the remaining two rows move relative to each other or move away from each other.

[0078] The hemming device C includes a translation seat C4 and a hemming wheel C3 arranged on the translation seat. The translation seat C4 is driven by a linear drive assembly.

[0079] like Figure 7-Figure 9 and Fig.12 As shown, the hemming method of the pulp molded container cover comprises the following steps:

[0080] S1, placing the cover, putting the cover of the pulp molded container to be rolled up with the cover opening facing downward on the telescopic inner expansion blocks 4 gathered together, that is, at this time, two adjacent telescopic inner expansion blocks 4 lean against each other;

[0081] S2, tightening, the telescopic inner expansion block 4 is radially translated outward along the axis of the hemming positioning seat 3, so that the outer peripheral surface of the telescopic inner expansion block 4 abuts against the inner wall of the pulp molded container cover. In the process of the telescopic inner expansion block 4 abutting against the inner wall of the pulp molded container cover, the elastic pressing device B presses down on the top surface of the pulp molded container cover;

[0082] S3, rolling, the rolling device C is driven by the translation driving force to approach the corresponding pulp molded container cover, and the rotation direction of the pulp molded container cover (i.e., the rotation direction of the rotating shaft 2) and the rolling device C (i.e., the rotation direction of the rolling wheel C3) are opposite, that is, an inner convex portion is rolled on the inner wall of the pulp molded container cover;

[0083] S4, remove the cover, the telescopic inner expansion block 4 is radially translated inward along the axis of the roll edge positioning seat 3, so that a gap is formed between the inner wall of the inner convex part and the outer peripheral surface of the telescopic inner expansion block 4, and then the pulp molded container cover is removed.

[0084] Pulp molded container lid after piping is attached Fig.10 .

[0085] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A telescopic hemming device for a pulp molded container cover, characterized in that: The device comprises: A fixed air supply seat (1); The rotating shaft (2) is in an upright state; the rotating shaft (2) passes through the fixed air supply seat (1) and the rotating shaft (2) can rotate relative to the fixed air supply seat (1); A rolling edge positioning seat (3) fixed to the top of the rotating shaft (2); There are a plurality of telescopic inner expansion blocks (4); the outer arc circumferential surface of the telescopic inner expansion block (4) is provided with an inner concave forming groove; the telescopic inner expansion blocks (4) are evenly distributed in a circle around the axis of the roll edge positioning seat (3), and the telescopic inner expansion blocks (4) translate on a plane perpendicular to the axis of the roll edge positioning seat (3); A pneumatic drive mechanism, comprising at least one first air path provided on the fixed air supply seat (1), and at least one second air path provided on the roll edge positioning seat (3), wherein each of the first air path and the second air path are connected and drive the telescopic inner expansion block (4) to translate on a plane perpendicular to the axis of the roll edge positioning seat (3) through gas; A plurality of radial slide grooves (31) are provided on the top of the rolling edge positioning seat (3), a sliding block (32) is provided on the lower surface of each of the telescopic inner expansion blocks (4), the sliding block (32) is movably installed in the radial slide groove (31), a closed air chamber (33) is provided between the lower surface of the sliding block (32) and the bottom of the radial slide groove (31), and the second air path is connected to at least one of the closed air chambers (33); A centering sleeve (5) is provided on the top of the fixed air supply seat (1) for rotating against the fixed air supply seat (1); a third air path connected to the first air path is provided inside the centering sleeve (5); a third air nozzle (50) connected to the third air path is provided on the outer peripheral surface of the centering sleeve (5); a second air nozzle (30) connected to the second air path is provided on the outer peripheral surface of the rolling edge positioning seat (3); and one of the third air nozzles (50) and one of the second air nozzles (30) are connected via a communication air pipe (40).

2. The telescopic hemming inner expansion device for pulp molded container cover according to claim 1, characterized in that: There are four telescopic inner expansion blocks (4), two first gas paths, and two second gas paths, and the gas supplied by each of the second gas paths drives two of the four telescopic inner expansion blocks (4) to translate on a plane perpendicular to the axis of the rolling edge positioning seat (3).

3. The telescopic hemming inner expansion device for pulp molded container cover according to claim 1, characterized in that: A flange (20) is provided on the top of the rotating shaft (2), the rolled edge positioning seat (3) is fixed to the upper surface of the flange (20), and the centering spacer (5) is fixed to the lower surface of the flange (20).

4. The telescopic hemming inner expansion device for pulp molded container cover according to claim 3, characterized in that: The flange (20) is provided with a plurality of cylindrical positioning pins (21), and the cross section of the centering spacer (5) is provided with a plurality of radial grooves (51), the inner groove wall of the radial groove (51) is a circular arc groove surface (52), the cylindrical positioning pin (21) is inserted into the radial groove (51), and a part of the cylindrical surface of the cylindrical positioning pin (21) matches and matches the circular arc groove surface.

5. A multi-station hemming device for pulp molded container lids, comprising a fixing frame (6), characterized in that: A plurality of telescopic hemming and inner expansion devices (A) for pulp molded container covers according to any one of claims 1 to 4 are rotatably arranged on the fixing frame (6).

6. The multi-station hemming equipment for pulp molded container lids according to claim 5, characterized in that: The device also includes an elastic downward pressing device (B) located above the telescopic rolling and expanding device of the pulp molded container cover, and also includes a rolling device (C) located on the side of the telescopic rolling and expanding device (A) of the pulp molded container cover.

7. The multi-station hemming equipment for pulp molded container lids according to claim 6, characterized in that: The telescopic hem expansion devices (A) of the pulp molded container cover are eight and the telescopic hem expansion devices (A) of the pulp molded container cover rotate synchronously in the same direction. The eight elastic downward pressing devices (B) are eight and the eight elastic downward pressing devices (B) are arranged on a lifting frame, and the lifting frame is connected to a lifting drive.

8. The multi-station hemming equipment for pulp molded container lids according to claim 7, characterized in that: The eight telescopic hem expansion devices (A) of the pulp molded container covers are arranged in three rows, wherein the number of the telescopic hem expansion devices (A) of the pulp molded container covers in the middle row is less than that in the other two rows, and the number of the telescopic hem expansion devices (A) of the pulp molded container covers in the other two rows is equal; There are eight said hemming devices (C), and the eight said hemming devices (C) are distributed in three rows, wherein the two said hemming devices (C) located in the middle position are in the same straight line with the telescopic hemming inner expansion devices (A) of the pulp molded container covers in the middle row, and the said hemming devices (C) in the remaining two rows are located one by one on the outside of the telescopic hemming inner expansion devices (A) of the pulp molded container covers in the corresponding rows.

9. The multi-station hemming equipment for pulp molded container lids according to claim 8, characterized in that: The two hemming devices (C) in the middle row move relative to each other or move away from each other; the hemming devices (C) in the remaining two rows move relative to each other or move away from each other.

10. The multi-station hemming equipment for pulp molded container lids according to claim 8, characterized in that: The hemming device (C) comprises a translation seat (C4) and a hemming wheel (C3) arranged on the translation seat.

11. A method for rolling a pulp molded container cover, using the multi-station rolling device for pulp molded container covers according to any one of claims 5 to 10, characterized in that: The hemming method comprises the following steps: S1, placing the cover, with the cover opening of the pulp molded container to be rolled facing downward, on the gathered telescopic inner expansion blocks (4); S2, tightening, the telescopic inner expansion block (4) is radially translated outward along the axis of the roll edge positioning seat (3), so that the outer peripheral surface of the telescopic inner expansion block (4) abuts against the inner wall of the pulp molded container cover, and in the process of the telescopic inner expansion block (4) abutting against the inner wall of the pulp molded container cover, the elastic downward pressing device (B) is pressed down on the top surface of the pulp molded container cover; S3, rolling, the rolling device (C) is driven by the translation driving force to approach the corresponding pulp molded container cover, the rotation direction of the pulp molded container cover is opposite to the rotation direction of the rolling device (C), that is, the inner convex portion is rolled on the inner wall of the pulp molded container cover; S4, removing the cover, the telescopic inner expansion block (4) is radially translated inwardly along the axis of the roll edge positioning seat (3), so that a gap is formed between the inner wall of the inner convex portion and the outer peripheral surface of the telescopic inner expansion block (4), and then the pulp molded container cover is removed.

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