A grooving unit and grooving method for a digital printing production line

Abstract

The present invention discloses a grooving unit for a digital printing production line, which includes a machine body and two grooving devices. A working cavity is provided inside the machine body, and the two grooving devices are relatively arranged at both ends of the working cavity; the grooving device includes a variable-speed grooving mechanism and an auxiliary grooving mechanism. The variable-speed grooving mechanism includes a grooving module and a variable-speed driving module. The grooving module includes a first rotating shaft and a plurality of conveying rollers. The plurality of conveying rollers are installed on the first rotating shaft at intervals. The conveying roller includes a conveying roller part installed on the first rotating shaft and a grooving roller part rotatably sleeved on the conveying roller part. The variable-speed driving module is used to drive the grooving roller part to rotate uniformly or variably on the conveying roller part; the auxiliary grooving mechanism includes a second rotating shaft and positioning rollers. The second rotating shaft is correspondingly arranged below the first rotating shaft, and the positioning rollers are installed on the second rotating shaft at intervals. The grooving unit and grooving method for the digital printing production line according to the present invention have high grooving efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of corrugated cardboard production, and in particular to a grooving unit and a grooving method for a digital printing production line. Background Art

[0002] Corrugated cardboard is a kind of packaging cardboard widely used in digital printing. In a digital printing production line, existing corrugated cardboard is generally made into continuous sheet-like corrugated cardboard, and then scored and grooved according to the required dimensions, and finally corrugated cardboard of a predetermined specification is made. Therefore, the equipment for grooving corrugated cardboard is an important part of corrugated cardboard production. After the corrugated cardboard is roll-pressed and scored by a scoring mechanism, it is necessary to groove the two ends of the scored lines formed on the corrugated cardboard respectively to distinguish the areas of the corrugated cardboard. The unscored part is the box body component part, and the grooved part is the cover plate part. Then the corrugated cardboard can be first folded along the scored line, the box body is formed by folding the box body component part, and then several cover plates at the two ends of the cover plate part are folded inward to form the top surface and the bottom surface of the box body by stacking. Therefore, the grooving accuracy and grooving efficiency of the corrugated cardboard grooving equipment have a very important impact on the processing of corrugated cardboard in the digital printing production line.

[0003] However, for the existing corrugated cardboard grooving equipment in the digital printing production line, the grooving structure for grooving the corrugated cardboard operates by always maintaining a constant speed rotation. After grooving the corrugated cardboard, there is a long idling time. When several corrugated cardboards are sequentially placed on the grooving equipment, the distance between adjacent corrugated cardboards needs to be relatively long, corresponding to the long idling time. However, the efficiency of this grooving method is low and cannot meet the needs of users. Summary of the Invention

[0004] The purpose of the present invention is to provide a grooving unit and a grooving method for a digital printing production line. The grooving unit can groove the two ends of the corrugated cardboard respectively through two grooving devices, and has high grooving efficiency.

[0005] To achieve the above purpose, the present invention provides the following technical solutions:

[0006] A grooving unit for a digital printing production line, comprising a machine body and two grooving devices. A working cavity is provided inside the machine body, and the two grooving devices are relatively arranged at both ends of the working cavity, and the two ends of the indentation line of the corrugated cardboard are grooved by the two grooving devices respectively. The grooving device includes a variable-speed grooving mechanism and an auxiliary grooving mechanism corresponding to the variable-speed grooving mechanism. The variable-speed grooving mechanism includes a grooving module and a variable-speed driving module. The grooving module includes a first rotating shaft and a plurality of conveying rollers. The first rotating shaft is rotatably installed at one end inside the working cavity, and the plurality of conveying rollers are installed on the first rotating shaft at intervals. The conveying roller includes a conveying roller part installed on the first rotating shaft and a grooving roller part rotatably sleeved on the conveying roller part. A grooving knife is provided on the grooving roller part. The variable-speed driving module is used to drive the grooving roller part to rotate at a constant speed during grooving and rotate at a variable speed during idling on the conveying roller part. The auxiliary grooving mechanism includes a second rotating shaft and a plurality of positioning rollers. The second rotating shaft is correspondingly arranged below the first rotating shaft and is rotatably installed at one end inside the working cavity. The plurality of positioning rollers are installed on the second rotating shaft at intervals. Each positioning roller corresponds to a conveying roller. A knife groove is provided on the positioning roller corresponding to the grooving knife on the grooving roller part. The corrugated cardboard is grooved by the cooperation of the grooving knife and the knife groove.

[0007] As a further technical solution of the present invention: The variable-speed driving module includes a third rotating shaft, a plurality of driving rollers installed on the third rotating shaft at intervals, and a variable-speed driving member. The third rotating shaft is correspondingly arranged above the first rotating shaft and is rotatably installed at one end inside the working cavity. A driving gear is provided on each driving roller. The driving gear corresponds to a grooving roller part on a conveying roller. A transmission gear is provided on the grooving roller part. The transmission gear is correspondingly meshed with the driving gear. The variable-speed driving member is used to rotate the third rotating shaft, so that the variable-speed driving member drives the third rotating shaft to rotate, and the driving gear drives the transmission gear to rotate, thereby driving the grooving roller part to rotate at a constant speed, accelerate or decelerate on the conveying roller part.

[0008] As a further technical solution of the present invention: The conveying roller part forms a pressing conveying section on one side of the grooving roller part. The positioning roller is correspondingly provided with a pressing conveying section corresponding to the pressing conveying section. When the corrugated cardboard passes between the positioning roller and the conveying roller, and rotates along with the rotation of the first rotating shaft and the second rotating shaft, the two sides of the corrugated cardboard are adhered to drive the corrugated cardboard to be conveyed.

[0009] As a further technical solution of the present invention: The grooving unit includes a conveying unit, which is arranged between two grooving devices. The conveying unit includes two fourth rotating shafts arranged oppositely. The two fourth rotating shafts are rotatably arranged in the middle of the working cavity. A number of auxiliary rollers are spaced on each fourth rotating shaft. Each auxiliary roller on one fourth rotating shaft corresponds to an auxiliary roller on the other fourth rotating shaft, so that the corrugated cardboard with grooving completed at the head end can penetrate between the two fourth rotating shafts. Each indentation line of the corrugated cardboard that needs to be grooved passes through between two corresponding auxiliary rollers of the two fourth rotating shafts during the process of being conveyed to the grooving device located at the rear end of the working cavity. The two auxiliary rollers are relatively attached to the two sides of the corrugated cardboard.

[0010] As a further technical solution of the present invention: A synchronous transmission mechanism is arranged between the two grooving devices and the conveying unit, and the two grooving devices and the conveying unit are driven to operate synchronously through the synchronous transmission mechanism.

[0011] As a further technical solution of the present invention: The synchronous transmission mechanism includes a synchronous driving part, transmission wheels respectively arranged at corresponding ends of each first rotating shaft, second rotating shaft and fourth rotating shaft, a number of auxiliary wheels for assisting in transmission, and transmission belts correspondingly sleeved on each transmission wheel and auxiliary wheel. The synchronous driving part is used to drive any one of the first rotating shaft, second rotating shaft or fourth rotating shaft to rotate, and the transmission wheels, auxiliary wheels and transmission belts cooperate with each other to drive the remaining first rotating shaft, second rotating shaft and fourth rotating shaft to rotate synchronously.

[0012] As a further technical solution of the present invention: Guide card strips are arranged along the shaft bodies of the first rotating shaft, second rotating shaft, third rotating shaft and fourth rotating shaft. The conveying rollers, positioning rollers, driving rollers and auxiliary rollers are all provided with mounting openings at the centers for mounting on the corresponding rotating shafts, and are all provided with card slots corresponding to the guide card strips on the mounting openings, so that the conveying rollers, positioning rollers, driving rollers and auxiliary rollers can respectively move along the guide card strips on the first rotating shaft, second rotating shaft, third rotating shaft and fourth rotating shaft.

[0013] As a further technical solution of the present invention: The grooving unit includes a shifting mechanism. The shifting mechanism includes a number of synchronous shifting units. Each synchronous shifting unit is used to drive a corresponding conveying roller and a positioning roller on the two grooving devices, the driving roller for driving the conveying roller, and two corresponding auxiliary rollers on the conveying unit to move synchronously along the first rotating shaft, second rotating shaft, third rotating shaft and fourth rotating shaft respectively, so as to perform position adjustment to adapt to the positions of the indentation lines that need to be grooved on corrugated cardboard of different specifications.

[0014] As a further technical solution of the present invention: The synchronous shifting unit includes two shifting plates arranged oppositely and a first shifting transmission structure. On both sides of one shifting plate, two conveying rollers, two driving rollers corresponding to the two grooving devices, and auxiliary rollers on a fourth rotating shaft are relatively supported. On both sides of the other shifting plate, two positioning rollers corresponding to the two grooving devices and auxiliary rollers on another fourth rotating shaft are relatively supported. The first shifting transmission structure includes a first displacement driving motor, a transmission lead screw, and two screw jacks oppositely arranged on the transmission lead screw. The transmission lead screw is erected vertically. The first displacement driving motor is arranged above the transmission lead screw to drive the transmission lead screw to rotate. Each screw jack is provided with a first driving lead screw. A first moving part is arranged on the first driving lead screw. Each first driving lead screw correspondingly passes through the shifting plates of the other synchronous shifting units. The first moving part thereon is connected to the corresponding shifting plate, so that the rotation of the transmission lead screw drives the first driving lead screw to rotate, and the first moving part drives the connected shifting plate to move along the first driving lead screw, thereby driving the corresponding conveying rollers, positioning rollers, driving rollers, and auxiliary rollers to move synchronously along the first rotating shaft, the second rotating shaft, the third rotating shaft, and the fourth rotating shaft respectively.

[0015] The grooving method of the grooving unit includes the following steps:

[0016] When the size of the corrugated cardboard changes or the distance between the corrugated cardboards is adjusted, resulting in a change in the length of the conveying gap between the corrugated cardboards, it is adjusted by adjusting the speed of the variable-speed driving module to drive the grooving roller part to rotate at a variable speed. When the size of the corrugated cardboard is smaller or the distance between the corrugated cardboards is reduced, the variable-speed driving module drives the grooving roller part to rotate at an accelerated speed idly. When the size of the corrugated cardboard is larger or the distance between the corrugated cardboards is increased, the variable-speed driving module drives the grooving roller part to rotate at a decelerated speed idly, so as to adapt to the conveying interval between the corrugated cardboards.

[0017] After adjusting the grooving device according to the size of the corrugated cardboard and the length of the conveying gap between the corrugated cardboards, several corrugated cardboards are sequentially input from one end of the working chamber. While the corrugated cardboards are being conveyed to the other end of the working chamber, the grooving device is used to groove both ends of the indentation lines of the corrugated cardboards.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows: The present invention provides a grooving unit and a grooving method for a digital printing production line. The two grooving devices are used to groove both ends of the corrugated cardboard respectively. According to the size specifications of the corrugated cardboard and the conveying interval between the corrugated cardboards, the variable-speed driving module is used to drive the grooving roller part to rotate at a constant speed during grooving and at a variable speed during idling on the conveying roller part, thereby reducing the idling time. The spacing of the corrugated cardboards can be adjusted, and the speed of the variable-speed driving module to drive the grooving roller part to rotate at a variable speed can be adjusted for adjustment to adapt to corrugated cardboards of different size specifications, effectively improving the grooving efficiency. Brief Description of the Drawings

[0019] Figure 1 It is a schematic diagram of the first perspective of a grooving unit for a digital printing production line.

[0020] Figure 2 It is a schematic diagram of the second perspective of a grooving unit for a digital printing production line.

[0021] Figure 3 It is Figure 2 the first partial view of

[0022] Figure 4 It is Figure 2 the second partial view of

[0023] Figure 5 It is a partial view of the first shifting drive structure.

[0024] Figure 6 It is a schematic diagram of the grooving unit for a digital printing production line after removing the first rotating shaft, the second rotating shaft, the third rotating shaft and the fourth rotating shaft.

[0025] Figure 7 It is Figure 6 the first partial view of

[0026] Figure 8 It is a schematic diagram of the synchronous drive mechanism. Detailed Description of the Invention

[0027] The following will describe in detail the specific embodiments of the present invention with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only for the purpose of illustration and explanation of the present invention, and are not intended to limit the protection scope of the present invention.

[0028] Please refer to Figure 1 、 Figure 2 A grooving unit for a digital printing production line includes a machine body 10, two groups of grooving devices 20 and a conveying unit 30 arranged between the two groups of grooving devices 20. A working cavity 11 is provided in the machine body 10. The two groups of grooving devices 20 are relatively arranged at both ends of the working cavity 11, and the conveying unit 30 is arranged in the middle of the working cavity 11. The two groups of grooving devices 20 are used to groove both ends of the crease line of the corrugated cardboard respectively, and the conveying unit 30 conveys the corrugated cardboard.

[0029] Refer to Figure 1 、 Figure 3 and Figure 7, the grooving device 20 is installed on the machine body 10 and includes a variable-speed grooving mechanism 21 and an auxiliary grooving mechanism 22 corresponding to the variable-speed grooving mechanism 21. The variable-speed grooving mechanism 21 includes a grooving module 40 and a variable-speed driving module 50. The grooving module 40 includes a first rotating shaft 41 and a plurality of conveying rollers 42. One end of the first rotating shaft 41 is rotatably installed in the working cavity 11, and a plurality of conveying rollers 42 are installed on the first rotating shaft 41 at intervals. The conveying roller 42 includes a conveying roller part 421 installed on the first rotating shaft 41 and a grooving roller part 422 rotatably sleeved on the conveying roller part 421. A grooving knife 423 is arranged along the edge of the grooving roller part 422. The length of the grooving knife 423 is greater than or equal to the length of the cut groove formed by grooving. The variable-speed driving module 50 is used to drive the grooving roller part 422 to rotate at a constant speed during grooving and rotate at a variable speed during idling on the conveying roller part 421, thereby reducing the idling time and being able to adjust the placement spacing of the corrugated cardboard, making the grooving efficiency higher;The auxiliary grooving mechanism 22 includes a second rotating shaft 221 and a plurality of positioning rollers 222. The second rotating shaft 221 is correspondingly arranged below the first rotating shaft 41 and is rotatably installed at one end within the working chamber 11. The plurality of positioning rollers 222 are installed on the second rotating shaft 221 at intervals. Each positioning roller 222 corresponds to a conveying roller 42. A positioning ring member 201 is installed on the positioning roller 222 corresponding to the grooving knife 423 on the grooving roller portion 422. A knife groove 202 is formed on the positioning ring member 201, so as to form the knife groove 202 on the positioning roller 222, for the grooving device 20 located at the front end of the working chamber 11 to groove the starting end of the indentation line of the corrugated paperboard, and the grooving device 20 located at the rear end of the working chamber 11 to groove the ending end of the indentation line of the corrugated paperboard. A plurality of corrugated paperboards are sequentially input between the first rotating shaft 41 and the second rotating shaft 221 of the grooving device 20. Each indentation line of the corrugated paperboard that needs to be grooved passes through between the corresponding positioning roller 222 and the conveying roller 42 during the conveying process. When grooving the starting end or the ending end of a corrugated paperboard, the variable-speed driving module 50 drives the grooving roller portion 422 to rotate at a constant speed, driving the grooving knife 423 to rotate into the knife groove 202 at a predetermined grooving position. Through the cooperation of the grooving knife 423 and the knife groove 202, the starting end or the ending end of the indentation line is grooved. Before the next corrugated paperboard is conveyed to the grooving device 20, according to the size of the corrugated paperboard and the length of the conveying gap between adjacent corrugated paperboards, the variable-speed driving module 50 drives the grooving roller portion 422 to rotate at a variable speed, so that while the next corrugated paperboard is conveyed into the grooving device 20, the grooving knife 423 returns to the predetermined grooving position along with the rotation of the grooving roller portion 422. The variable-speed driving module 50 drives the grooving roller portion 422 to rotate at a constant speed again, and through the cooperation of the grooving knife 423 and the knife groove 202, the starting end or the ending end of the indentation line of the next corrugated paperboard is grooved. In this way, the above process is repeated to complete the grooving of both ends of the indentation lines of a plurality of corrugated paperboards, and the variable-speed driving module 50 can be used to drive the grooving roller portion 422 to rotate at a variable speed to adapt to the conveying intervals of different corrugated paperboards to be grooved on the grooving device, so as to adjust the conveying intervals of the corrugated paperboards to be grooved on the grooving device.;

[0030] The variable speed drive module 50 includes a third rotating shaft 51, a plurality of driving rollers 52 spacedly mounted on the third rotating shaft 51, and a variable speed driving member 53. The third rotating shaft 51 is correspondingly disposed above the first rotating shaft 41 and is rotatably mounted at one end within the working chamber 11. A driving gear 521 is provided on each driving roller 52. The driving gear 521 is correspondingly arranged with a grooved roller portion 422 on a conveying roller 42. A transmission gear 501 is provided on the grooved roller portion 422, and the transmission gear 501 is correspondingly meshed with the driving gear 521. The variable speed driving member 53 is disposed outside the working chamber 11 and is used to rotate the third rotating shaft 51. For the variable speed driving member 53 to drive the third rotating shaft 51 to rotate, the driving gear 521 drives the transmission gear 501 to rotate, thereby driving the grooved roller portion 422 to rotate uniformly, accelerate or decelerate on the conveying roller portion 421.

[0031] Further, a pressing and conveying section 401 is formed on one side of the grooved roller portion 422 of the conveying roller portion 421. The positioning roller 222 is correspondingly provided with a pressing and conveying section 402 for the pressing and conveying section 401. When the corrugated cardboard passes between the positioning roller 222 and the conveying roller 42, it rotates along with the rotation of the first rotating shaft 41 and the second rotating shaft 221, and adheres to both sides of the corrugated cardboard to improve the conveying stability.

[0032] Further, referring to Figure 1 、 Figure 6 and Figure 7 The conveying unit 30 includes two relatively arranged fourth rotating shafts 31. The two fourth rotating shafts 31 are rotatably disposed in the middle of the working chamber 11. A plurality of auxiliary rollers 32 are spacedly provided on each fourth rotating shaft 31. Each auxiliary roller 32 on one fourth rotating shaft 31 corresponds to an auxiliary roller 32 on the other fourth rotating shaft 31. For the corrugated cardboard with the slotting completed at the head end to pass between the two fourth rotating shafts 31. Each score line that needs to be slotted on the corrugated cardboard passes between two auxiliary rollers 32 corresponding to the two fourth rotating shafts 31 during the process of being conveyed to the slotting device 20 located at the rear end of the working chamber 11. The two auxiliary rollers 32 relatively adhere to both sides of the corrugated cardboard to improve the conveying stability.

[0033] Further, referring to Figure 8, a synchronous transmission mechanism 60 is provided between the two groups of grooving devices 20 and the conveying unit 30, and the two groups of grooving devices 20 and the conveying unit 30 are driven to operate synchronously through the synchronous transmission mechanism 60; the synchronous transmission mechanism 60 includes a synchronous driving member 61, transmission wheels 62 respectively arranged at corresponding ends of each first rotating shaft 41, second rotating shaft 221 and fourth rotating shaft 31, a plurality of auxiliary wheels 63 for assisting in transmission, and transmission belts 64 correspondingly sleeved on each transmission wheel 62 and auxiliary wheel 63. The synchronous driving member 61 is used to drive any one of the first rotating shaft 41, second rotating shaft 221 or fourth rotating shaft 31 to rotate, and the transmission wheels 62, auxiliary wheels 63 and transmission belts 64 cooperate with each other to drive the remaining first rotating shaft 41, second rotating shaft 221 and fourth rotating shaft 31 to rotate synchronously.

[0034] Further, referring to Figure 1 , Figure 3 , guiding clamping strips 601 are arranged along the shaft bodies of the first rotating shaft 41, second rotating shaft 221, third rotating shaft 51 and fourth rotating shaft 31. The conveying rollers 42, positioning rollers 222, driving rollers 52 and auxiliary rollers 32 are all provided with mounting openings at the centers for mounting on the corresponding rotating shafts, and are all provided with clamping grooves corresponding to and engaging with the guiding clamping strips 601 on the mounting openings, so that the conveying rollers 42, positioning rollers 222, driving rollers 52 and auxiliary rollers 32 can respectively move along the guiding clamping strips 601 on the first rotating shaft 41, second rotating shaft 221, third rotating shaft 51 and fourth rotating shaft 31.

[0035] Further, referring to Figure 1 , Figure 4 , Figure 5 and Figure 6 , the grooving unit includes a displacement mechanism 70, and the displacement mechanism 70 includes a plurality of synchronous displacement units 701. Each synchronous displacement unit 701 is used to drive a corresponding conveying roller 42 and a positioning roller 222 on the two groups of grooving devices 20, the driving roller 52 for driving the conveying roller 42, and two corresponding auxiliary rollers 32 on the conveying unit 30 to move synchronously along the first rotating shaft 41, second rotating shaft 221, third rotating shaft 51 and fourth rotating shaft 31 respectively, so as to adjust their positions, so as to adapt to the positions of the indentation lines that need to be grooved on corrugated cardboard of different specifications.

[0036] The synchronous shifting unit 701 includes two relatively arranged shifting plates 71, and a first shifting transmission structure 72 or a second transmission structure 73. On both sides of one shifting plate 71, two corresponding conveying rollers 42, two driving rollers 52 on two grooving devices 20, and auxiliary rollers 32 on a fourth rotating shaft 31 are relatively supported. On both sides of the other shifting plate 71, two corresponding positioning rollers 222 on two grooving devices 20 and auxiliary rollers 32 on another fourth rotating shaft 31 are relatively supported. The first shifting transmission structure 72 includes a first displacement driving motor 721, a transmission lead screw 722, and two lead screw elevators 723 relatively arranged on the transmission lead screw 722. The transmission lead screw 722 is erected, and the first displacement driving motor 721 is arranged above the transmission lead screw 722 to drive the transmission lead screw 722 to rotate. A first driving lead screw 724 is arranged on each lead screw elevator 723, and a first movable member 725 is arranged on the first driving lead screw 724. Each first driving lead screw 724 correspondingly passes through the shifting plate 71 of the remaining synchronous shifting units 701, and the first movable member 725 thereon is connected to the corresponding shifting plate 71, so that the rotation of the transmission lead screw 722 drives the first driving lead screw 724 to rotate, and the first movable member 725 drives the connected shifting plate 71 to move along the first driving lead screw 724, thereby driving the corresponding conveying rollers 42, positioning rollers 222, driving rollers 52, and auxiliary rollers 32 to move synchronously along the first rotating shaft 41, the second rotating shaft 221, the third rotating shaft 51, and the fourth rotating shaft 31 respectively.

[0037] Further, the second transmission structure 73 includes two relatively arranged second driving lead screws 731, a synchronous belt structure 732 arranged between one ends of the two second driving lead screws 731 to drive the second driving lead screws 731 to rotate, and a second displacement driving motor 733 used to drive the synchronous belt structure 732 to operate. A second movable member 734 is arranged on each second driving lead screw 731. Each second driving lead screw 731 is rotatably arranged in the working cavity 11. The second driving lead screw 731 correspondingly passes through the shifting plate 71 of the remaining synchronous shifting units 701, and the second movable member 734 thereon is connected to the corresponding shifting plate 71, so that the second displacement driving motor 733 drives the synchronous belt structure 732 to operate, drives the second driving lead screws 731 to rotate, and the second movable member 734 drives the connected shifting plate 71 to move along the second driving lead screw 731.

[0038] Further, the shifting mechanism 70 includes two sets of guide rail groups. The two sets of guide rail groups are relatively fixed on the top and bottom of the working cavity 11. Each guide rail group includes two relatively arranged positioning guide rails 702. Each shifting plate 71 is correspondingly arranged above or below a guide rail group. Two sliders 703 are relatively arranged at one end of the shifting plate 71 facing the corresponding guide rail group. Each slider 703 is slidably and correspondingly installed on a positioning guide rail 702, thereby enhancing the stability of the shifting plate 71 during movement.

[0039] Furthermore, a height adjusting structure 101 for adjusting the installation height of the second rotating shaft 221 in the working cavity 11 is provided below the second rotating shaft 221 in the working cavity 11.

[0040] The grooving method of the grooving unit is as follows:

[0041] Before conveying the corrugated cardboard, adjust the grooving device according to the size of the corrugated cardboard, the position of the indentation line, and the conveying gap length between the corrugated cardboards.

[0042] When the size of the corrugated cardboard changes and the position of the indentation line changes, several synchronous shifting units 701 of the shifting mechanism 70 drive the corresponding conveying rollers 42, positioning rollers 222, driving rollers 52, and auxiliary rollers 32 to move synchronously along the first rotating shaft 41, the second rotating shaft 221, the third rotating shaft 51, and the fourth rotating shaft 31 respectively, so that the positions of the conveying rollers 42, positioning rollers 222, driving rollers 52, and auxiliary rollers 32 are aligned with the position of the indentation line on the corrugated cardboard.

[0043] When the size of the corrugated cardboard changes or the distance between the corrugated cardboards is adjusted, resulting in a change in the conveying gap length between the corrugated cardboards, adjust by adjusting the speed of the variable-speed drive module 50 to drive the grooving roller part 422 to rotate at a variable speed. When the size of the corrugated cardboard is small, the variable-speed drive module 50 drives the grooving roller part 422 to accelerate and idle, and when the size of the corrugated cardboard is large, the variable-speed drive module 50 drives the grooving roller part 422 to decelerate and idle, so as to adapt to the change in the size of the corrugated cardboard and the conveying interval between the corrugated cardboards.

[0044] After adjusting the grooving device according to the size of the corrugated cardboard, the position of the indentation line, and the conveying gap length between the corrugated cardboards, several corrugated cardboards are sequentially input from one end of the working cavity 11. While the corrugated cardboard is being conveyed to the other end of the working cavity 11, the grooving device 20 grooves both ends of the indentation line of the corrugated cardboard.

[0045] In addition, it can be understood that the grooving device can also directly groove the corrugated cardboard without an indentation line.

[0046] In summary, in a grooving unit and a grooving method for a digital printing production line according to the present invention, two grooving devices 20 respectively groove both ends of a corrugated cardboard, and according to the size specification of the corrugated cardboard and the conveying interval between corrugated cardboards, a variable-speed drive module 50 is used to drive the grooving roller part 422 to rotate at a constant speed during grooving and at a variable speed during idling on the conveying roller part 421, thereby reducing the idling time, being able to adjust the placement interval of the corrugated cardboards, and being able to adjust the speed at which the variable-speed drive module 50 drives the grooving roller part 422 to rotate variably for adjustment to adapt to corrugated cardboards of different size specifications, effectively improving the grooving efficiency.

[0047] As long as it does not violate the idea of the present invention, any combination of various different embodiments of the present invention shall be regarded as the content disclosed in the present invention; within the scope of the technical concept of the present invention, various simple modifications of the technical solution and any combination of different embodiments that do not violate the idea of the present invention shall be within the protection scope of the present invention.

Claims

1. A grooving unit for a digital printing production line, characterized in that: It includes a machine body (10) and two groups of grooving devices (20). A working cavity (11) is provided inside the machine body (10). The two groups of grooving devices (20) are relatively arranged at both ends of the working cavity (11). The two ends of the indentation line of the corrugated cardboard are grooved by the two groups of grooving devices (20) respectively. The grooving device (20) includes a variable-speed grooving mechanism (21) and an auxiliary grooving mechanism (22) arranged corresponding to the variable-speed grooving mechanism (21). The variable-speed grooving mechanism (21) includes a grooving module (40) and a variable-speed driving module (50). The grooving module (40) includes a first rotating shaft (41) and a plurality of conveying rollers (42). The first rotating shaft (41) is rotatably installed at one end inside the working cavity (11). The plurality of conveying rollers (42) are installed on the first rotating shaft (41) at intervals. The conveying roller (42) includes a conveying roller part (421) installed on the first rotating shaft (41) and a grooving roller part (422) rotatably sleeved on the conveying roller part (421). A grooving knife (423) is provided on the grooving roller part (422). The variable-speed driving module (50) is used to drive the grooving roller part (422) to rotate at a constant speed during grooving and rotate at a variable speed during idling on the conveying roller part (421). The auxiliary grooving mechanism (22) includes a second rotating shaft (221) and a plurality of positioning rollers (222). The second rotating shaft (221) is correspondingly arranged below the first rotating shaft (41) and is rotatably installed at one end inside the working cavity (11). The plurality of positioning rollers (222) are installed on the second rotating shaft (221) at intervals. Each positioning roller (222) corresponds to a conveying roller (42). A knife groove (202) is provided on the positioning roller (222) corresponding to the grooving knife (423) on the grooving roller part (422). The corrugated cardboard is grooved by the cooperation of the grooving knife (423) and the knife groove (202). The variable-speed driving module (50) includes a third rotating shaft (51), a plurality of driving rollers (52) installed on the third rotating shaft (51) at intervals, and a variable-speed driving part (53). The third rotating shaft (51) is correspondingly arranged above the first rotating shaft (41) and is rotatably installed at one end inside the working cavity (11). A driving gear (521) is provided on each driving roller (52). The driving gear (521) is arranged corresponding to a grooving roller part (422) on a conveying roller (42). A transmission gear (501) is provided on the grooving roller part (422). The transmission gear (501) is correspondingly meshed with the driving gear (521). The variable-speed driving part (53) is used to rotate the third rotating shaft (51). For the variable-speed driving part (53) to drive the third rotating shaft (51) to rotate, the driving gear (521) drives the transmission gear (501) to rotate, so as to drive the grooving roller part (422) to rotate at a constant speed, accelerate or decelerate on the conveying roller part (421).

2. The grooving unit according to claim 1, wherein: The conveying roller part (421) is formed with a pressing and conveying section (401) on one side of the grooving roller part (422). The positioning roller (222) is provided with a pressing and conveying section (402) corresponding to the pressing and conveying section (401). When the corrugated cardboard passes between the positioning roller (222) and the conveying roller (42), the pressing and conveying section (401) and the pressing and conveying section (402) rotate along with the rotation of the first rotating shaft (41) and the second rotating shaft (221), fitting the two sides of the corrugated cardboard and driving the corrugated cardboard to be conveyed.

3. The grooving unit according to claim 1, wherein: The grooving unit includes a conveying unit (30). The conveying unit (30) is arranged between two groups of grooving devices (20). The conveying unit (30) includes two relatively arranged fourth rotating shafts (31). The two fourth rotating shafts (31) are rotatably arranged in the middle of the working cavity (11). A plurality of auxiliary rollers (32) are arranged at intervals on each fourth rotating shaft (31). Each auxiliary roller (32) on one fourth rotating shaft (31) corresponds to an auxiliary roller (32) on the other fourth rotating shaft (31), so that the corrugated cardboard with grooving completed at the head end can penetrate between the two fourth rotating shafts (31). Each scoring line of the corrugated cardboard that needs to be grooved passes between two auxiliary rollers (32) corresponding to the two fourth rotating shafts (31) during the process of being conveyed to the grooving device (20) located at the rear end of the working cavity (11). The two auxiliary rollers (32) are relatively fitted to the two sides of the corrugated cardboard.

4. The grooving unit according to claim 3, characterized in that: A synchronous transmission mechanism (60) is arranged between the two groups of grooving devices (20) and the conveying unit (30). The synchronous transmission mechanism (60) drives the two groups of grooving devices (20) and the conveying unit (30) to operate synchronously.

5. The grooving unit according to claim 4, wherein: The synchronous transmission mechanism (60) includes a synchronous driving part (61), transmission wheels (62) respectively arranged at corresponding ends of each first rotating shaft (41), second rotating shaft (221) and fourth rotating shaft (31), and a transmission belt (64) sleeved on each transmission wheel (62) and auxiliary wheel (63) corresponding to a plurality of auxiliary wheels (63) for auxiliary transmission. The synchronous driving part (61) is used to drive any one of the first rotating shaft (41), second rotating shaft (221) or fourth rotating shaft (31) to rotate. The transmission wheels (62), auxiliary wheels (63) and transmission belt (64) cooperate with each other to drive the remaining first rotating shaft (41), second rotating shaft (221) and fourth rotating shaft (31) to rotate synchronously.

6. The grooving unit according to claim 3, wherein: Guide card strips (601) are provided along the shaft bodies on the first rotating shaft (41), the second rotating shaft (221), the third rotating shaft (51) and the fourth rotating shaft (31). Mounting openings for mounting to the corresponding rotating shafts are provided at the centers of the conveying rollers (42), the positioning rollers (222), the driving rollers (52) and the auxiliary rollers (32), and card slots corresponding to the guide card strips (601) are provided on the mounting openings, so that the conveying rollers (42), the positioning rollers (222), the driving rollers (52) and the auxiliary rollers (32) can move along the guide card strips (601) on the first rotating shaft (41), the second rotating shaft (221), the third rotating shaft (51) and the fourth rotating shaft (31) respectively.

7. The grooving unit according to claim 6, characterized in that: The grooving unit includes a shifting mechanism (70), and the shifting mechanism (70) includes a plurality of synchronous shifting units (701). Each synchronous shifting unit (701) is used to drive a corresponding conveying roller (42) and a positioning roller (222) on two grooving devices (20), the driving roller (52) for driving the conveying roller (42), and two corresponding auxiliary rollers (32) on the conveying unit (30) to move synchronously along the first rotating shaft (41), the second rotating shaft (221), the third rotating shaft (51) and the fourth rotating shaft (31) respectively, so as to perform position adjustment to adapt to the positions of the creasing lines that need to be grooved on corrugated cardboard of different specifications.

8. The grooving unit according to claim 7, characterized in that: The synchronous shifting unit (701) includes two relatively arranged shifting plates (71) and a first shifting transmission structure (72). On both sides of one shifting plate (71), two corresponding conveying rollers (42), two driving rollers (52) on two grooving devices (20), and auxiliary rollers (32) on a fourth rotating shaft (31) are relatively supported. On both sides of the other shifting plate (71), two corresponding positioning rollers (222) on two grooving devices (20) and auxiliary rollers (32) on another fourth rotating shaft (31) are relatively supported. The first shifting transmission structure (72) includes a first displacement driving motor (721), a transmission lead screw (722), and two lead screw lifters (723) relatively arranged on the transmission lead screw (722). The transmission lead screw (722) is erected, and the first displacement driving motor (721) is arranged above the transmission lead screw (722) to drive the transmission lead screw (722) to rotate. Each lead screw lifter (723) is provided with a first driving lead screw (724), and a first movable part (725) is arranged on the first driving lead screw (724). Each first driving lead screw (724) correspondingly passes through the shifting plates (71) of the remaining synchronous shifting units (701), and the first movable part (725) thereon is connected to the corresponding shifting plate (71), so that the rotation of the transmission lead screw (722) drives the first driving lead screw (724) to rotate, and the first movable part (725) drives the connected shifting plate (71) to move along the first driving lead screw (724), thereby driving the corresponding conveying rollers (42), positioning rollers (222), driving rollers (52), and auxiliary rollers (32) to synchronously move along the first rotating shaft (41), the second rotating shaft (221), the third rotating shaft (51), and the fourth rotating shaft (31) respectively.

9. The grooving method of the grooving unit according to claim 1, comprising the following steps: When the size of the corrugated cardboard changes or the distance between the corrugated cardboards is adjusted, resulting in a change in the conveying gap length between the corrugated cardboards, adjustment is made by adjusting the speed at which the grooving roller part rotates variably driven by the variable speed drive module. When the size of the corrugated cardboard is smaller or the distance between the corrugated cardboards is reduced, the variable speed drive module (50) drives the grooving roller part (422) to accelerate and idle. When the size of the corrugated cardboard is larger or the distance between the corrugated cardboards is increased, the variable speed drive module (50) drives the grooving roller part (422) to decelerate and idle, so as to adapt to the conveying interval between the corrugated cardboards. After the grooving device is adjusted according to the size of the corrugated cardboard and the conveying gap length between the corrugated cardboards, several corrugated cardboards are sequentially input from one end of the working chamber (11). While the corrugated cardboards are being conveyed to the other end of the working chamber (11), the two ends of the indentation lines of the corrugated cardboards are grooved by the grooving device (20).

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