Workpiece circulation printing line

Abstract

The utility model provides a workpiece circulation printing line, and relates to the technical field of plastic part processing, the workpiece circulation printing line comprises a workbench, a guide rail, a transmission tool and a driving mechanism, the workbench is provided with a feeding and discharging station, a screen printing station, a first curing station, a transfer printing station and a second curing station; the guide rail is arranged on the workbench and sequentially passes through the feeding and discharging station, the screen printing station, the first curing station, the transfer printing station and the second curing station to form a closed loop. The multiple conveying tools are movably arranged on the guide rail, and the conveying tools are used for bearing workpieces to flow among the stations. According to the workpiece circulation printing line, the guide rail and the driving mechanism are arranged on the workbench, and the guide rail penetrates through all the machining stations in a closed loop mode, so that when the driving mechanism drives the conveying tool to move on the guide rail, machining operation is carried out on all the machining stations in sequence, feeding and discharging on the same side are achieved, and printing machining is completed after one-time circulation; therefore, a circulating operation line is formed, and printing processing efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of plastic parts processing, in particular to a workpiece circulation printing line. Background Art

[0002] Silkscreen and pad printing are two common printing techniques used in modern manufacturing for plastic parts, widely used in electronics, home appliances, automotive parts, and other fields. Silkscreen printing involves transferring ink to the surface of a plastic part via a screen. The core equipment for this process includes a screen printer, screen, and scraper. Silkscreen printing is suitable for flat or slightly curved plastic parts, offering advantages such as rich colors and strong wear resistance. The production of the screen requires sophisticated platemaking technology to ensure the clarity and accuracy of the pattern. Pad printing is an indirect printing process that transfers ink from a pattern on a steel or copper plate to the surface of a plastic part via a silicone pad. Pad printers are the core equipment for this process and are primarily available in single-color, two-color, and multi-color versions. They are capable of accurately reproducing complex patterns on irregular surfaces and small components. The pad printing process is suitable for curved, concave, convex, and other irregular surfaces and is widely used in products such as small electronic accessories and toys.

[0003] Prior art discloses a screen printing mechanism for plastic parts, with authorization number CN221678265U. This mechanism uses a conveyor belt to transport workpieces to a screen printing station, where they are positioned and then screen-printed. Dust removal is performed during the transfer process to improve the printing effect. However, this solution makes it difficult to form a circulating production line for screen printing plastic parts. Large-scale printing operations require a large area and suffer from low printing efficiency. Utility Model Content

[0004] In view of this, the utility model proposes a workpiece circulation printing line, which arranges guide rails and driving mechanisms on the workbench, and makes the guide rails pass through each processing station in a closed loop, so that when the driving mechanism drives the transmission tooling to move on the guide rails, it passes through each processing station in succession to perform processing operations, realizing loading and unloading on the same side, and completing the printing processing after one cycle, thereby forming a circulation operation line and improving the printing processing efficiency.

[0005] The technical solution of the present invention is achieved as follows: The present invention provides a workpiece circulation printing line, including a workbench, a guide rail, a transmission tooling and a driving mechanism, wherein:

[0006] The workbench is equipped with loading and unloading stations, screen printing station, first curing station, pad printing station and second curing station;

[0007] The guide rail is set on the workbench and passes through the loading and unloading station, screen printing station, first curing station, pad printing station and second curing station in sequence to form a closed loop;

[0008] There are multiple transfer fixtures, all of which are movably arranged on the guide rails. The transfer fixtures are used to carry workpieces and transfer them between various workstations.

[0009] The driving mechanism is arranged on the workbench, and the driving mechanism includes a flexible transmission member, and the flexible transmission member is connected to all the transmission toolings to drive all the transmission toolings to move synchronously on the guide rail.

[0010] On the basis of the above technical solution, preferably, a defective part rejection station is further provided on the workbench, and the defective part rejection station is arranged between the second curing station and the loading and unloading station.

[0011] On the basis of the above technical solution, preferably, the driving mechanism also includes at least two changing wheels, which are all arranged on the workbench and are all connected to the flexible transmission member for driving the flexible transmission member to move through the changing wheels and change the moving direction of the transmission tooling.

[0012] Further preferably, the driving mechanism further includes a bracket and a driving part, wherein,

[0013] The number of the brackets is the same as the number of the direction-changing wheels, and all of them are fixed on the workbench, and the direction-changing wheels are arranged on the brackets in a one-to-one correspondence;

[0014] The driving part is fixed on one of the brackets and is connected to the direction-changing wheel on the bracket in a transmission manner.

[0015] On the basis of the above technical solution, preferably, the transmission tooling includes a base and a carrier plate, wherein:

[0016] The base is slidably arranged on the guide rail;

[0017] The carrier plate is fixed on the base. A plurality of accommodating grooves are provided on the carrier plate. The accommodating grooves are used to accommodate the workpieces flowing on the printing line.

[0018] Further preferably, the base includes a pedestal and a pulley, wherein:

[0019] The base is arranged on the guide rail;

[0020] There are multiple pulleys, all of which are arranged at the bottom of the base. The multiple pulleys are respectively located on both sides of the guide rail in the length direction and are in contact with the outside of the guide rail.

[0021] More preferably, an annular limiting groove is provided on the pulley, and the guide rail extends into the annular limiting groove of each pulley to limit the movement direction of the pulley.

[0022] On the basis of the above technical solution, preferably, it further includes a workstation positioning component, which is arranged on a workbench and is used to contact the transfer tooling and lock the transfer tooling at the workstation.

[0023] Further preferably, the workstation positioning assembly includes a cylinder, a transmission mechanism and a positioning part, wherein:

[0024] One end of the cylinder is hinged to the workbench;

[0025] The transmission mechanism is arranged on the workbench and is hinged to the other end of the cylinder;

[0026] The positioning part is arranged on the transmission mechanism, and the transmission mechanism is used for driving the positioning part to rotate through the transmission mechanism by the extension and contraction of the cylinder, so as to contact and leave the transmission tooling.

[0027] More preferably, a positioning groove is provided on the transmission tooling, and the positioning portion is adapted to the positioning groove so that the transmission tooling is locked after the positioning portion is inserted into the positioning groove.

[0028] The workpiece circulation printing line of the utility model has the following beneficial effects compared with the prior art:

[0029] (1) By arranging a guide rail and a driving mechanism on the workbench, and making the guide rail pass through each processing station in a closed loop, the driving mechanism drives the transmission tooling to move on the guide rail, and successively passes through each processing station for processing operations, realizing loading and unloading on the same side, and completing the printing process after one cycle, thereby forming a circular operation line and improving the printing process efficiency;

[0030] (2) By setting a workstation positioning component and correspondingly setting a positioning groove on the transfer tooling base, the positioning part on the workstation positioning component contacts the transfer tooling and locks its position to avoid printing failures caused by deviation and reduce the failure rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0032] Figure 1 A three-dimensional diagram of a workpiece circulation printing line according to the present invention;

[0033] Figure 2 It is a side view of the workpiece circulation printing line of the present invention;

[0034] Figure 3 for Figure 1 A is an enlarged schematic diagram;

[0035] Figure 4 This is a schematic diagram of the base structure of the workpiece circulation printing line of the present utility model;

[0036] Figure 5 It is a partially enlarged structural schematic diagram of the workpiece circulation printing line of the present invention. DETAILED DESCRIPTION

[0037] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0038] like Figure 1-5 As shown, the workpiece circulation printing line of the present invention includes a workbench 1, a guide rail 2, a transmission tool 3 and a driving mechanism 4.

[0039] The workbench 1 is provided with a loading and unloading station 101, a screen printing station 102, a first curing station 103, a pad printing station 104 and a second curing station 105. The workbench 1 is directly set on the ground, and its table top is parallel to the ground. In order to ensure stable and high-quality printing operations, a protective cover can be built on the table top of the workbench 1 using a glass plate.

[0040] Two robotic arms are set on the workbench 1, one of which is set on the outside of the loading and unloading station 101, and grabs the workpiece through vacuum negative pressure to perform loading and unloading operations. The other robotic arm is set on the pad printing station 104 to perform pattern pad printing operations. A screen printing machine is set on the outside of the screen printing station 102, and the screen printing machine directly extends the screen printing frame to the screen printing station 102 to perform screen printing operations on the workpiece of the screen printing station 102. The first curing station 103 and the second curing station 105 can be used to quickly cure the printed pattern by setting a light curing lamp or a fan. The screen printing station 102 and the pad printing station 104 can be adapted to different pattern printing requirements, and compared with a single printing method, the combination of the two printing methods has a better printing effect.

[0041] The guide rail 2 is arranged on the workbench 1 and passes through the loading and unloading station 101, the screen printing station 102, the first curing station 103, the pad printing station 104 and the second curing station 105 in sequence to form a closed loop.

[0042] In this embodiment, the guide rail 2 forms a closed square frame on the workbench 1, and the equipment on the circulation line is all arranged on the workbench 1, among which the silk screen printing and pad printing equipment are all arranged in the square frame formed by the guide rail 2. The loading and unloading station 101, the silk screen printing station 102, the first curing station 103, the pad printing station 104 and the second curing station 105 are arranged in sequence along the guide rail 2, so that the workpiece can reach each station in sequence for processing during the circulation process.

[0043] There are multiple transfer toolings 3, and they are all movably arranged on the guide rail 2. The transfer tooling 3 is used to carry the workpiece and flow between various stations. In this embodiment, multiple workpieces can be carried on the transfer tooling 3 at the same time to realize batch printing operations. The transfer tooling 3 can be on the guide rail 2 and pass through the loading and unloading station 101, the screen printing station 102, the first curing station 103, the pad printing station 104 and the second curing station 105 in sequence. Taking a certain transfer tooling 3 as an example, at the loading and unloading station 101, the workpiece is placed in the transfer tooling 3 and moves on the guide rail 2 with the transfer tooling 3, and is screen-printed, cured, pad-printed, and cured in sequence, and finally returns to the loading and unloading station 101 to unload the printed workpiece and load it again to realize a cyclic printing operation. The same station setting for loading and unloading can also reduce the production line cost, compress the space occupied by equipment, and arrange the equipment in a distributed manner at stations, which is also more convenient for equipment inspection and maintenance.

[0044] In addition, in order to ensure that each workstation can be in working condition when the transfer tooling 3 moves synchronously, the number of transfer tooling 3 should be no less than the number of workstations. In order to provide the production line with subsequent equipment function expansion, multiple empty workstations can also be set on the workbench 1.

[0045] The driving mechanism 4 is arranged on the workbench 1, and the driving mechanism 4 includes a flexible transmission member 41. The flexible transmission member 41 is connected to all the transmission tooling 3 for driving all the transmission tooling 3 to move synchronously on the guide rail 2. In this embodiment, since the guide rail 2 is not arranged in a straight line, but is formed by a completely square closed loop, the driving mechanism 4 needs to drive all the transmission tooling 3 to move through the flexible transmission member 41 to adapt to the shape of the guide rail 2. It should be noted that the four corners of the square of the guide rail 2 are set to be rounded to cooperate with the movement of the transmission tooling 3 and the driving mechanism 4.

[0046] In this embodiment, a defective part rejection station 106 is also provided on the workbench 1, and the defective part rejection station 106 is arranged between the second curing station 105 and the loading and unloading station 101. The defective part rejection station 106 can remove the workpiece with offset printing pattern after the transfer tooling 3 enters the defective part rejection station 106. Specifically, the defective part rejection station 106 is provided with a three-axis module for multi-directional movement, so as to use a negative pressure suction cup to grab the defective parts, remove them from the circulation line, and send them to the recovery tray for recycling.

[0047] It should be noted that before the defective part rejection station 106, an inspection station is also set up. An industrial camera is set up on the inspection station. The camera takes the image of the workpiece, and the algorithm performs comparative analysis to determine the pattern offset and judge whether it needs to be rejected.

[0048] The driving mechanism 4 also includes at least two changing wheels 42 , which are all arranged on the workbench 1 and are connected to the flexible transmission member 41 for driving the flexible transmission member 41 to move through the changing wheels 42 and change the moving direction of the transmission tooling 3 .

[0049] In this embodiment, since the guide rail 2 is configured as a square frame with rounded corners, the number of the changing wheels 42 needs to be set to at least four. The changing wheels 42 are preferably sprockets, and the flexible transmission member 41 is a chain. By connecting the transmission tooling 3 with a certain section of the flexible transmission member 41, the transmission connection between the flexible transmission member 41 and the transmission tooling 3 is realized, and all the transmission tooling 3 can be driven to move synchronously and cyclically on the guide rail 2.

[0050] As a preferred embodiment, the driving mechanism 4 also includes a bracket 43 and a driving part 44. The number of the brackets 43 is the same as the number of the changing wheels 42, and all are fixed on the workbench 1. The changing wheels 42 are arranged on the brackets 43 in a one-to-one correspondence. The driving part 44 is fixed on one of the brackets 43 and is connected to the changing wheel 42 on the bracket 43 in transmission.

[0051] There are four brackets 43, which are respectively fixed on the inner sides of the four rounded corners of the square frame formed by the guide rail 2 and are located at the axis of the rounded corners of the square frame. Four changing wheels 42 are also selected. The changing wheels 42 are set on the brackets 43 through the rotating shaft, and support the flexible transmission member 41 so that the flexible transmission member 41 moves along the guide rail 2. The driving part 44 is preferably a motor, which is set on one of the four brackets 43 and can be directly installed inside the workbench 1. The rotating shaft is driven by the output end of the motor to drive the changing wheel 42 to rotate, and then drive the flexible transmission member 41 to move, so that all the transmission tooling 3 move together.

[0052] In this embodiment, the transmission tooling 3 includes a base 31 and a carrier plate 32. The base 31 is slidably set on the guide rail 2, and the carrier plate 32 is fixed on the base 31. The carrier plate 32 is provided with a plurality of accommodating grooves, and the accommodating grooves are used to accommodate workpieces flowing on the printing line.

[0053] Specifically, eight receiving slots are provided on the carrier plate 32 , and the eight receiving slots are divided into two rows and evenly spaced. During the loading and unloading process, the robot arm can directly grab the workpiece and place it into or out of the receiving slot.

[0054] As a preferred embodiment, the base 31 includes a base 311 and a pulley 312. The base 311 is set on the guide rail 2. There are multiple pulleys 312, and they are all set at the bottom of the base 311. The multiple pulleys 312 are respectively located on both sides of the length direction of the guide rail 2 and are all in contact with the outside of the guide rail 2.

[0055] Specifically, there are four pulleys 312, which are symmetrically distributed. In order to prevent the pulley 312 from getting stuck when turning on the guide rail 2, the pulley 312 is not completely pressed against the guide rail 2, but a certain margin is left, and the distance between two adjacent pulleys 312 is set to be smaller to increase its turning radius.

[0056] In addition, an annular limiting groove is provided on the pulley 312 , and the guide rail 2 extends into the annular limiting groove of each pulley 312 to limit the movement direction of the pulley 312 .

[0057] The annular limit groove is set to prevent the pulley 312 from detaching from the guide rail 2 due to the margin set between the pulley 312 and the guide rail 2, and the cross-section of the annular groove on the pulley 312 is set in a V shape, so that it can have a certain offset ability and reduce hard friction when turning.

[0058] Since the pulley 312 does not press the guide rail 2, after the transfer tooling 3 reaches a certain station, especially the silk screen station 102 and the pad printing station 104, there may be a certain offset, which affects the printing quality. Therefore, in this embodiment, a station positioning component 5 is also provided. The station positioning component 5 is provided on the workbench 1. The station positioning component 5 is used to contact the transfer tooling 3 and lock the transfer tooling 3 at its station.

[0059] The workstation positioning component 5 contacts the transfer tool 3 and locks its position to avoid printing failure caused by deviation and reduce the failure rate.

[0060] Specifically, the workstation positioning assembly 5 includes a cylinder 51, a transmission mechanism 52 and a positioning portion 53. One end of the cylinder 51 is hinged on the workbench 1. The transmission mechanism 52 is arranged on the workbench 1 and is hinged to the other end of the cylinder 51. The positioning portion 53 is arranged on the transmission mechanism 52. The transmission mechanism 52 is used to extend and retract the cylinder 51 through the transmission mechanism 52 to drive the positioning portion 53 to rotate so as to contact and leave the transmission tooling 3.

[0061] For the transfer fixtures 3 on the same straight line, a cylinder 51 may be provided to synchronously push the multiple positioning parts 53 to rotate, so as to achieve simultaneous positioning of the multiple transfer fixtures 3, thereby reducing equipment costs.

[0062] The transmission mechanism 52 is preferably a crossbar for transmission. The crossbar can be directly set on the workbench 1 and can rotate along the circumferential direction. The cylinder 51 drives the crossbar to rotate, thereby driving the positioning part 53 to rotate synchronously.

[0063] In addition, a positioning groove is provided on the transmission tooling 3, and the positioning portion 53 is adapted to the positioning groove so that the positioning portion 53 can lock the transmission tooling 3 after being inserted into the positioning groove. The positioning groove is U-shaped, and the end of the positioning portion 53 is cylindrical. During the process of inserting the positioning groove, the positioning portion 53 will correct the position of the transmission tooling 3 and lock the transmission tooling 3.

[0064] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A workpiece circulation printing line, characterized by: It comprises a workbench (1), a guide rail (2), a transmission tool (3) and a driving mechanism (4), wherein: The workbench (1) is provided with a loading and unloading station (101), a screen printing station (102), a first curing station (103), a pad printing station (104) and a second curing station (105); The guide rail (2) is arranged on the workbench (1) and passes through the loading and unloading station (101), the screen printing station (102), the first curing station (103), the pad printing station (104) and the second curing station (105) in sequence to form a closed loop; There are multiple transfer tools (3), all of which are movably arranged on the guide rail (2), and the transfer tools (3) are used to carry workpieces and transfer them between various workstations; A driving mechanism (4) is arranged on the workbench (1), and the driving mechanism (4) includes a flexible transmission member (41). The flexible transmission member (41) is connected to all the transmission tools (3) in a transmission manner to drive all the transmission tools (3) to move synchronously on the guide rail (2).

2. The workpiece circulation printing line according to claim 1, characterized in that: The workbench (1) is also provided with a defective part rejection station (106), and the defective part rejection station (106) is arranged between the second curing station (105) and the loading and unloading station (101).

3. The workpiece circulation printing line according to claim 1, characterized in that: The driving mechanism (4) further comprises at least two direction-changing wheels (42), each of which is arranged on the workbench (1) and is in transmission connection with the flexible transmission member (41) so as to drive the flexible transmission member (41) to move via the direction-changing wheels (42) and change the moving direction of the transmission tooling (3).

4. The workpiece circulation printing line according to claim 3, characterized in that: The driving mechanism (4) further includes a bracket (43) and a driving part (44), wherein: The number of the brackets (43) is the same as the number of the direction-changing wheels (42), and both are fixed on the workbench (1), and the direction-changing wheels (42) are arranged on the brackets (43) in a one-to-one correspondence; The driving part (44) is fixed on one of the brackets (43) and is connected to the direction-changing wheel (42) on the bracket (43) in a transmission manner.

5. The workpiece circulation printing line according to claim 1, characterized in that: The transmission tool (3) comprises a base (31) and a carrier plate (32), wherein: The base (31) is slidably arranged on the guide rail (2); The carrier plate (32) is fixed on the base (31), and a plurality of accommodating grooves are provided on the carrier plate (32), and the accommodating grooves are used to accommodate workpieces flowing on the printing line.

6. The workpiece circulation printing line according to claim 5, characterized in that: The base (31) includes a pedestal (311) and a pulley (312), wherein: The base (311) is arranged on the guide rail (2); There are multiple pulleys (312), all of which are arranged at the bottom of the base (311). The multiple pulleys (312) are respectively located on both sides of the guide rail (2) in the length direction, and all of them are in contact with the outside of the guide rail (2).

7. The workpiece circulation printing line according to claim 6, characterized in that: An annular limiting groove is provided on the pulley (312), and the guide rail (2) extends into the annular limiting groove of each pulley (312) to limit the movement direction of the pulley (312).

8. The workpiece circulation printing line according to claim 1, characterized in that: It also includes a workstation positioning component (5), which is arranged on the workbench (1) and is used to contact the transfer tooling (3) and lock the transfer tooling (3) at the workstation.

9. The workpiece circulation printing line according to claim 8, characterized in that: The workstation positioning assembly (5) includes a cylinder (51), a transmission mechanism (52) and a positioning portion (53), wherein: One end of the cylinder (51) is hinged on the workbench (1); The transmission mechanism (52) is arranged on the workbench (1) and is hinged to the other end of the cylinder (51); The positioning portion (53) is arranged on the transmission mechanism (52), and the transmission mechanism (52) is used to drive the positioning portion (53) to rotate through the transmission mechanism (52) by the extension and contraction of the cylinder (51) so as to contact and leave the transmission tooling (3).

10. The workpiece circulation printing line according to claim 9, characterized in that: A positioning groove is provided on the transmission tool (3), and the positioning portion (53) is adapted to the positioning groove so that the transmission tool (3) is locked after the positioning portion (53) is inserted into the positioning groove.

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