Plastic Tableware Manufacturing Process Control System Based on Internet of Things Technology

Abstract

The present invention relates to a control system for the manufacturing process of plastic tableware based on Internet of Things technology. By specifically constructing the production data of each order, a production drive system supported by data and intelligently managed is established, including a computer with a PLC, an injection molding machine, a transmission device, a vacuum coating machine, a data acquisition and transmission module, production line equipment, mobile equipment, other industrial control equipment, and a storage room. The data acquisition and transmission module includes data chips of intelligent equipment and various types of sensors used in the manufacturing and processing process, and data transmission is carried out in the production scenario through wireless communication protocols such as Bluetooth. The present invention combines a new generation of PLC and corresponding software to realize real-time monitoring of the entire production cycle of plastic tableware, and realizes continuous process control under a parallel control strategy. It not only meets the requirements of the vacuum coating process, but also runs stably and reliably, with a reasonable structure, ensuring high-efficiency and high-quality production, greatly reducing labor intensity, and improving production efficiency.

Description

Technical Field

[0001] The present invention belongs to the technical field of tracking, traceability, and quality control in the product manufacturing process, and particularly relates to a control system for the tableware manufacturing process digitized based on Internet of Things technology. Background Art

[0002] The manufacturing process of plastic tableware mainly includes: raw material preparation (mixing color powder and injection molding particles in proportion), injection molding, vacuum coating, and packaging and warehousing. When producing according to customer orders, although different customers have different requirements, such as colors and patterns, they are usually similar in the shape of the same variety. Especially in the blank stage of production, that is, after injection molding, the shapes are approximately the same and are easily confused, resulting in errors in the subsequent coating process, causing property losses due to product scrapping and time impacts on order delays;

[0003] In addition, in the daily management of the plastic tableware production workshop, such as process assignment, processing, packaging, and the process management of the entry and exit of accessories, most factories still stay in the traditional process-based management mode, relying on manual input and computer record management. There are time-consuming manual operations, and the error rate is high and data traceability is difficult in the information flow and interaction process of the manufacturing process.

[0004] The Chinese invention patent with the authorization announcement number CN 112765768 B discloses a discrete workshop digital traceability method based on the Internet of Things. This method uploads the production data, personnel data, and quality inspection data of the finished products collected in real time to the cloud platform database through the 4G / 5G network, finds the main factors affecting the quality of the finished products through principal component analysis, completes the prediction of data in space, time, and space-time points, restores the missing spatio-temporal data through spatio-temporal field reconstruction, conducts grid search in space to find the location where the event occurs, and then finds the abnormal spatio-temporal production data; improves the abnormal production process, simulates and emulates in the IRobotSIM simulation environment, simulates the production process during the abnormal time period, and corrects the process route and process parameters through closed-loop tuning by observing the comparison results of the real-time production data of the production unit processing and the extracted historical data, and uses the mining technology of industrial big data to find the law of quality transfer from the massive time series production and manufacturing data, and the value of industrial big data is fully utilized. This invention actually provides a general framework of a control system. For problems such as the easy confusion of semi-finished products of different orders, high error rate in the information flow and interaction process, and difficult data traceability mentioned above in specific scenarios, it still needs to be supplemented and improved according to the corresponding characteristics in the scenario.

[0005] On the other hand, at present, the vacuum coating process still mainly relies on manual placement of tableware on the fixtures, and after coating, it is taken down manually, with high labor costs and low production efficiency. Summary of the Invention

[0006] In view of the defects existing in the above-mentioned prior art, the technical problem to be solved by the present invention is to provide a control system for the manufacturing process of plastic tableware based on Internet of Things technology. The system automatically collects, identifies, and updates the identity information of the work-in-progress through a reader, and quickly and accurately provides real-time information of the materials for the operators of different roles in the workshop. At the same time, the improved vacuum coating process realizes the automatic picking and placing of tableware.

[0007] The object of the present invention is achieved by the following technical solutions: A control system for the manufacturing process of plastic tableware based on Internet of Things technology, by specifically constructing the production data of each order, and building a production-driven system supported by data and intelligently managed, including a computer with a PLC, an injection molding machine, a transmission device, a vacuum coating machine, a data acquisition and transmission module, production line equipment, movable equipment, other industrial control equipment, and a storage room;

[0008] The data acquisition and transmission module includes a data chip of intelligent equipment and various types of sensors used in the manufacturing and processing process, and performs data transmission in the production scenario through wireless communication protocols such as Bluetooth.

[0009] The movable equipment includes a turnover rack mainly circulating between the injection molding machine, the vacuum coating machine, and the storage room for turning over and placing dinner plates in tableware. The number of dinner plates that a turnover rack can carry is designed according to the number of products coated at one time. The data chip can be detachably pasted on the turnover rack according to batches. Thus, how many batches an order is divided into, the working station information of each batch in real-time circulation, the completed processes, the remaining processes, whether there is a production anomaly at the present stage or the anomalies that have occurred can all be obtained in real-time in the computer through the data chip. With the support of the information of the data chip, the personnel and equipment in the workshop can timely and accurately transfer the work-in-progress to the corresponding set processes.

[0010] Preferably, the turnover rack includes a turnover rack central column and a plurality of movable trays sleeved on the turnover rack central column. The tray includes an inner ring as a circular ring, an outer ring as a bone structure member with several evenly spaced placement spaces, and a supporting member fixed on the bone structure member and on each placement space; the tray is used to receive dinner plates at the working station of the injection molding machine and carry the dinner plates into the coating tank in the vacuum coating process. The tray enters the turnover rack central column from the top and exits from the bottom. The dinner plates are placed on the supporting members and do not need to be manually inverted after being placed once, and are directly processed to packaging after all.

[0011] Preferably, the inner wall of the circular ring of the skeleton member is provided with an elastic bead. A triangular positioning plate extends upward from the upper end of the ring, with an arc consistent with the inner wall. A notch is provided on the lower end of the ring, corresponding to the positioning plate. The elastic bead serves as a guide, its flexible arrangement facilitating its switching between different contact positions. The positioning plate serves two functions: positioning and triggering the release of the limiter when the tray returns from the coating machine to the center column of the turnover rack.

[0012] Preferably, the support member includes a large bottom ring fixedly connected to the frame member, a small top ring located above the large bottom ring, and a plurality of springs securely supporting the large bottom ring and the small top ring. Three or more universally rotatable rolling balls are evenly spaced on the top surface of the small top ring. The structural arrangement of the support member is designed to ensure uniform coating.

[0013] Preferably, the central column of the turnover rack is in the shape of a circular tube as a whole, and its outer diameter is the same as the inner diameter of the inner ring of the pallet. The outer surface has an inner concave surface running through the entire length along the axial direction, and the inner concave surface is used to accommodate elastic beads.

[0014] Preferably, the lower part of the central column of the turnover frame has a damping section, and above the damping section is a limit ring detachably connected to the central column of the turnover frame, and the lower end surface of the central column of the turnover frame has a connecting head.

[0015] Preferably, the vacuum coating machine includes a vertical coating tank, a tank cover, a tubular fixture center column, and a mounting base for fixing the center column; the transmission system is arranged in the tank cover and has both revolution and rotation; the upper end of the fixture center column has a joint portion that matches the connector, and a threaded groove surrounds the entire length of the circumference; a plurality of circular holes are arrayed in the threaded groove, and the range of the circular holes basically covers the entire length of the threaded groove, and a delay and limit assembly is installed in each circular hole. The setting of the delay and limit assembly has the function of delaying to prevent the tray from falling due to excessive falling speed, and the function of limiting is to ensure the mutual spacing between the trays, and in terms of orientation, because it is set in the spiral groove, its orientation naturally obtains an up and down staggered effect.

[0016] Preferably, the delay and limiting assembly includes a character body whose arc section has a cross-sectional shape and curvature matching the threaded groove, a straight section that can move into the circular hole in the threaded groove, an arc-shaped gasket that is fitted and connected, a compression spring, and a blocking portion integrally formed with the character body, and the upward end of the arc section of the character body has a guiding slope.

[0017] Preferably, the vacuum coating machine further includes a driving rod placed inside the center post of the fixture. The overall length of the driving rod is basically the same as that of the center post of the fixture. A section near the lower end is a driving section with a larger diameter. The size of the driving section is set such that when it contacts the end of the straight section of the delay and limit assembly, it can completely push it out beyond the thread groove. A quick connector is provided near the upper end of the driving rod.

[0018] Preferably, the vacuum coating machine further includes a connecting rod placed inside the center post of the turnover rack. The overall length of the connecting rod is longer than that of the center post of the turnover rack. The bottom of the connecting rod has a receiving joint connected to the quick connector.

[0019] In summary, the present invention has the following advantages compared with the prior art:

[0020] In the production of plastic tableware, the present invention utilizes the production data of each order constructed, combines the new generation of PLC and the corresponding software, realizes the real-time monitoring of the entire production cycle of plastic tableware, and realizes the continuous process control under the parallel control strategy. It not only meets the requirements of the vacuum coating process, but also operates stably and reliably, with a reasonable structure, ensuring high-efficiency and high-quality production, greatly reducing the labor intensity, and improving the production efficiency. The overall technical solution includes a computer with a PLC, an injection molding machine, a transmission device, a vacuum coating machine, a data acquisition and transmission module, production line equipment, movable equipment, other industrial control equipment, and a storage room;

[0021] The data acquisition and transmission module includes the data chip of intelligent equipment and various types of sensors used in the manufacturing and processing process, and conducts data transmission in the production scenario through wireless communication protocols such as Bluetooth.

[0022] The movable equipment includes a turnover rack for turning over and placing dinner plates among an injection molding machine, a vacuum coating machine, and a storage area. The number of items that a turnover rack can carry is designed according to the number of products coated at one time. The data chips can be detachably pasted on the turnover rack in batches. Thus, information such as how many batches an order is divided into, the working station information of each batch in real-time circulation, the completed processes, the remaining processes, whether there are production abnormalities at the current stage or the abnormalities that have occurred can be obtained in real-time through the data chips in the computer. With the support of the information on the data chips, the personnel and equipment in the workshop can transfer the work-in-progress to the corresponding set processes in a timely and error-free manner. The data chips can automatically identify the identity of the work-in-progress through a handheld RFID reader, an Android smartphone, or a wireless receiver, providing the operators of different roles in the workshop with the identity information of the materials quickly and accurately, getting rid of the time-consuming manual operations in the traditional workshop and reducing the error rate in the information flow and interaction process during the manufacturing process. At the same time, the system processes the obtained material production data to meet the needs of different types of data for materials at different stages and different operations. Finally, the final data of each production unit is stored in the database. The powerful data is applied to the whole process of workshop manufacturing, transforming the management of the daily production process in the workshop, such as dispatching, processing, packaging, and the inbound and outbound of accessories, from the original manual intervention input management process to automatic information collection and processing.

[0023] When the turnover rack is used at the injection molding station, its tray is in a compressed state, so the overall occupied space is small. When the turnover rack reaches the coating station, it can cooperate with the coating fixture to complete the full automation of loading and unloading, greatly improving the efficiency of the preparatory work before coating. And the setting method of the heavy thread grooves on the coating fixture makes the tableware fall into place in a natural and well-spaced manner, so that the upper and lower spaces of the coated tableware do not completely overlap, thus achieving better coating consistency. Brief Description of the Drawings

[0024] Figure 1 is a schematic structural diagram of the present invention (part of the production line equipment and movable equipment are not fully shown);

[0025] Figure 2 is Figure 1 a partial enlarged view of part A in

[0026] Figure 3 a schematic structural diagram of the turnover rack;

[0027] Figure 4 is a schematic structural diagram of the coating tank with the tray placed;

[0028] Figure 5 is a schematic structural diagram of the turnover rack unloading the tray to the center column of the fixture;

[0029] Figure 6 is Figure 5 The partial enlarged view at position B in

[0030] Figure 7 is the structural schematic diagram after the fixture central column 43 is combined with a single tray;

[0031] Figure 8 is Figure 7 The partial enlarged view at position C in

[0032] Figure 9 is the structural schematic diagram of the coating tank filled with trays;

[0033] Figure 10 is the structural schematic diagram of the bone structure member;

[0034] Figure 11 is the structural schematic diagram of the supporting member;

[0035] Figure 12 is the structural schematic diagram of the fixture central column and the mounting base combined and installed with a number of trays;

[0036] Figure 13 is Figure 12 The partial enlarged view at position D in

[0037] Figure 14 is the structural schematic diagram of the delay and limit assembly;

[0038] Figure 15 is the structural schematic diagram of the drive rod.

[0039] Markings in the figure:

[0040] Computer 01, injection molding machine 02, transmission device 03, vacuum coating machine 04, coating tank 41, tank cover 42, fixture central column 43, joint part 431, threaded groove 432, mounting base 44, delay and limit assembly 45, T-shaped body 451, arc-shaped gasket 452, compression spring 453, blocking part 454, guiding inclined plane 455, dinner plate 05, turnover rack 100, turnover rack central column 110, concave surface 110A, damping section 111, limiting ring 112, connecting head 113, tray 120, bone structure member 121, elastic bead 121A, positioning plate 121B, notch 121C, supporting member 122, bottom large ring 122A, top small ring 122B, spring 122C, rolling ball 122D, drive rod 46, drive section 461, quick connector 462, connecting rod 47. Specific embodiments

[0041] The present invention will be further described below in conjunction with the embodiments shown in the drawings:

[0042] Embodiment 1

[0043] The present disclosure provides a control system for the manufacturing process of plastic tableware based on Internet of Things technology. By specifically constructing the production data of each order, a production-driven system supported by data and intelligently managed is established. Specifically, the entire order is divided into a certain number of production batches, and then the identity information, progress information, and production anomaly information of each production batch in the workshop are monitored in real time to form a convenient application solution.

[0044] As Figure 1 shown, it includes a computer 01 with a PLC, an injection molding machine 02, a transmission device 03, a vacuum coating machine 04, as well as a data acquisition and transmission module, production line equipment, movable equipment, other industrial control equipment, and a storage room not shown in the figure; the data acquisition and transmission module can build a safe, reliable, and high-speed network system using industrial Ethernet, 5G, Internet of Things, Wi-Fi, and Bluetooth wireless networks, and use protocols such as Profinet / MOdbus / Ethercat, OPC UA, TCP / IP, etc. for data transmission to achieve the collection and transmission of enterprise production and operation data.

[0045] The data acquisition and transmission module includes data chips of intelligent equipment and various types of sensors (such as temperature sensors, pressure sensors, or vibration sensors) used in the manufacturing process, and performs data transmission in the production scenario through wireless communication protocols such as Bluetooth.

[0046] The movable equipment includes a turnover rack 100 that mainly circulates between the injection molding machine 02, the vacuum coating machine 04, and the storage room; for the production and manufacturing of plastic tableware, the injection molding process is a continuous production, while the coating process requires a series of processes such as loading and unloading, vacuum pumping, and heating, and the production rhythm is relatively slow and intermittent. Therefore, the number of products that a turnover rack 100 can carry is designed according to the number of products coated at one time, and the data chip can be detachably pasted on the turnover rack 100 according to batches. In this way, the number of batches into which an order is divided, the working station information of each batch flowing in real time, the completed processes, the remaining processes, whether there are any anomalies at the present stage or the anomalies that have occurred can all be obtained in real time in the computer 01 through the data chip; in this way, the semi-finished products formed by continuous injection molding are sequentially placed on the turnover rack 100, and with the support of the information of the data chip, they can accurately enter the corresponding set processes and production adjustments for handling inserted orders.

[0047] The turnover rack 100 of this embodiment is used for turnover and placement of the dinner plates 05 in tableware. The turnover rack 100 can also be appropriately deformed to be applicable to other types of tableware. The turnover rack 100 includes a turnover rack central column 110 and a plurality of trays 120 movably sleeved on the turnover rack central column 110. The tray 120 includes a circular ring on the inner circle, a bone structure member 121 with a number of equally spaced placement spaces on the outer circle, and a supporting member 122 fixed on the bone structure member 121 and on each placement space. The tray 120 is used to receive the dinner plate 05 at the station of the injection molding machine 02, and then carries the dinner plate 05 into the coating tank during the process of the vacuum coating machine 04. The tray 120 is for upper-in and lower-out, that is, it slides in from the upper part in the injection molding machine 02 and slides out from the lower part in the vacuum coating machine 04 and continuously enters the vacuum coating machine 04, without manual placement.

[0048] As Figure 10 shown, the inner wall of the circular ring of the bone structure member 121 has an elastic bead 121A. At the position of the elastic bead, a triangular positioning plate 121B with an arc extending upward on the upper end surface of the circular ring and consistent with the inner wall is provided. At the lower end surface of the circular ring, at the position corresponding to the positioning plate 121B, there is a notch 121C, and this notch 121C is used to accommodate the positioning plate 121B in the lower-layer tray 120, so as to achieve the determination of the mutual position and the compression in distance between the two.

[0049] The supporting member 122 includes a bottom large ring 122A fixed to the bone structure member 121, a top small ring 122B located above the bottom large ring 122A, and a number of springs 122C are used as fixed supports to connect between the bottom large ring 122A and the top small ring 122B. Three or more universally rotatable rolling balls 122D are evenly spaced on the upper surface of the top small ring 122B. When in use, the dish-shaped tableware is buckled on the supporting member 122, and only the lower bottom surface of the tableware contacts the rolling balls 122D. When the tray 120 enters the coating operation, as the corresponding coating device rotates, the position of the lower bottom surface of the tableware and the rolling balls 122D will change, so as to complete the coating of all tableware.

[0050] The turnover rack central column 110 is integrally a circular tube, the outer diameter is the same as the inner diameter of the inner circular ring of the tray 120, and the outer surface has an inner concave surface 110A running through the whole length along the axial direction. This inner concave surface is used to accommodate the elastic bead 121A, which is convenient for the consistent arrangement of the trays 120 in the turnover rack central column 110. The advantage of the consistent arrangement is that it can ensure that the positioning plate 121B of the upper-layer tray 120 coincides with the notch 121C of the lower layer, so that the dinner plate 05 on the lower-layer tray 120 can be pressed by the upper-layer tray 120, and thus the dinner plates of the whole turnover rack 100 can be stabilized.

[0051] The lower part of the central column 110 of the turnover rack has a damping section 111. Above the damping section 111 is a limit ring 112 detachably fixed to the central column 110 of the turnover rack. The lower end face of the central column 110 of the turnover rack has a connector 113; the limit ring 112 is generally locked on the central column 110 of the turnover rack and is removed when the tray 120 needs to be lowered.

[0052] Coating tanks of vacuum coating machines generally come in two types: horizontal and vertical. For example, in the Chinese invention patent authorization announcement number CN111041444B, the coating tank in a vacuum coating fixture and a vacuum coating device is vertical, and in the Chinese invention patent application publication number CN114855127A, the coating tank of the anti-rust automatic plating device for the pin shaft of a loader is horizontal. Regardless of the form, their working structures are the same, and they are all composed of a workpiece hanging rack or fixture, a transmission system, and a power system. The transmission system makes the workpiece hanging rack revolve and rotate simultaneously. The vacuum coating machine 04 of this embodiment includes a vertical coating tank 41, a tank cover 42, a tubular fixture central column 43, and a mounting base 44 for fixedly installing the central column 43; the transmission system is arranged in the tank cover 42 and has revolution and rotation functions. The upper mouth part of the fixture central column 43 has a joint part 431 that matches the connector 113, and a threaded groove 432 is wound around the circumferential surface of the entire length. The threaded groove 432 is preferably arc-shaped and matches the size of the elastic bead 121A. See Figure 6 , Figure 12 ; A plurality of round holes are arrayed in the threaded groove 432, and the range of the round holes basically covers the entire length of the threaded groove 432. A resistance and limit combination 45 is installed in each round hole. See Figure 13 - 14 ; The joint part 431 is connected to the transmission system in the tank cover 42 during the coating process, and this connection is completed when the tank cover 42 is closed and separated when the tank cover 42 is opened.

[0053] The resistance and limit combination 45 includes a T-shaped body 451 whose arc segment has a shape and radian that match the cross-section of the threaded groove and a straight segment that can move into the round hole in the threaded groove 432, a sleeved arc-shaped gasket 452, a compression spring 453, and a blocking part 454 integrally formed with the T-shaped body 451. The structure is shown in Figure 14 , After the arc-shaped resistance and limit combination 45 is installed in the threaded groove 432, one end of the compression spring 453 abuts against the arc-shaped gasket and the other end abuts against the blocking part 454, so that the T-shaped body 451 falls into the threaded groove 432. See Figure 8 and Figure 13, at this time, the arc segment of the T-shaped body 451 completely falls into the thread groove 432, and its most prominent part exposed outside is slightly out of the thread groove 432, aiming to generate friction with the downward sliding of the tray 120, so as to delay the downward sliding speed of the tray 120. One end of the arc segment facing upward has a guiding inclined surface 455, and the guiding inclined surface 455 is for the elastic bead 121A to slide out from the guiding inclined surface when sliding in the thread groove 432;

[0054] Figure 13 The figure shows a dynamic schematic diagram of the tray 120 carrying the dinner plate 05 sliding downward in the jig central column 43. The dotted tray 120 represents sliding downward from top to bottom. First, when the tray 120 enters the jig central column 43, the elastic bead 121A will fall into the thread groove 432. Subsequently, the tray 120 slides downward under gravity and comes to the position of the delay and limit assembly 45 under the guidance of the thread groove 432. After passing through the guiding inclined surface 455, the elastic bead 121A disengages from the thread groove 432 and continues to slide straight downward under gravity into the next thread groove 432, and so on, until it encounters a delay and limit assembly 45 that is pushed outwards and completely exceeds the thread groove 432. At this time, when the lower end surface of the subsequent tray 120 contacts the delay and limit assembly 45, the delay and limit assembly 45 is rotated to the horizontal position by the impact of the tray 120, and at the same time, the tray 120 is limited to this position. See the solid-line tray 120 in Figure 13 Figure.

[0055] According to the process description in the previous paragraph, relevant components for driving the delay and limit assembly 45 to push it out need to be set in the jig central column 43. This component is a driving rod 46 placed inside the jig central column 43. The overall length of the driving rod 46 is basically the same as that of the jig central column 43. A section near the lower end is a driving section 461 with a larger diameter. The size of the driving section 461 is set so that when it contacts the straight section end of the delay and limit assembly 45, it can push it out completely beyond the thread groove 432. A quick connector 462 is provided near the upper end of the driving rod 46; during operation, the driving rod 46 is lifted section by section from bottom to top in the jig central column 43 corresponding to the position of the delay and limit assembly 45. That is, every time a tray 120 is lowered, the driving section 461 is lifted upward by one section, and the tray 120 will be limited by the delay and limit assembly 45 one by one as described above.

[0056] To facilitate the lifting of the driving rod 46, a connecting rod 47 with an overall length longer than the turnover rack central column 110 is placed inside the turnover rack central column 110. The bottom of the connecting rod has a receiving joint connected to the quick connector 462. See Figure 3, in this way, when the turnover rack 100 comes above the fixture center column 43, after the connector 113 is engaged with the engaging portion 431, the quick connector 462 and the receiving connector are also connected simultaneously, and then the connecting rod 47 is pulled upward to drive the driving rod 46 to move upward.

[0057] The working principle and steps of the turnover rack 100 for unloading the tray 120 into the coating tank 41 for coating and taking out the tray 120 from the coating tank 41 are as follows:

[0058] A. The turnover rack 100 is transported above the coating tank 41 by a gantry crane or other transmission device, and the turnover rack center column 110 is engaged with the fixture center column 43. At this time, the concave surface 110A and the thread groove 432 at the engagement part are aligned;

[0059] B. Remove the limit ring 112, and the trays 120 slide down one by one, and the damping section 111 plays a role in separation;

[0060] C. Starting from the first tray 120 that enters, the connecting rod 47 is lifted upward to drive the driving rod 46 to intermittently lift upward by the distance of a delay and limit assembly 45, and all the fixture center columns 43 are filled one by one in sequence;

[0061] D. After coating is completed, the turnover rack center column 110 and the fixture center column 43 are engaged again, and the tray 120 returns upward to the turnover rack center column 110. Specifically, it can be lifted one by one or in groups from above, or pushed upward starting from the bottom one, and there is no interference. This is because when the tray 120 rises, the positioning plate 121B will first contact the T-shaped body 451, and the triangular inclined surface of the positioning plate 121B matches the spiral angle of the thread groove 432. After contact, the T-shaped body 451 is forced into the thread groove 432 and reset under the action of the compression spring 453.

[0062] Process demonstration of the workshop manufacturing process data acquisition and management system based on the Internet of Things:

[0063] A. The computer 01 matches the production data of each order and divides it into several production batches with a certain quantity, assigns codes to the data chips according to the raw materials required for the production batches, and all the data chips follow the raw materials to flow to the injection molding machine 02;

[0064] B. The data chips are transferred to the turnover rack 100, and the corresponding batch quantity of the injection-molded products is allocated to the corresponding turnover rack 100. Because there are data chips on the turnover rack 100, the latest production information can be tracked and updated in real time;

[0065] C. After the turnover rack 100 is transferred to the packaging station, a two-dimensional traceability code is corresponding to the surface of the outer packaging box. The information of the traceability code comes from the data chip, so that the entire production chain can be tracked and traced until it is out of the warehouse.

[0066] Example 2

[0067] The position of the T-shaped body 451 in the thread groove 432 in the delay and limit assembly 45 is set to be lower than the thread groove 432. The protruding height of the T-shaped body 451 in the thread groove 432 is controlled by setting the diameter of the driving rod 46. In this way, when the tray 120 is to be taken out after the coating is completed, the driving rod 46 is completely pulled out, and the upwardly moved tray 120 will not be blocked by the delay and limit assembly 45, and it is easier for the tray 120 to return to the central column 110 of the turnover rack. When the tray 120 enters, the required delay can still be ensured due to the setting of the diameter of the driving rod 46.

[0068] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Those skilled in the art to which the present invention pertains can make various modifications or supplements to the described specific embodiments or use similar methods for substitution, but will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A plastic tableware manufacturing process control system based on Internet of Things technology, which constructs production data for each order in a targeted manner and builds a production-driven system supported by data and intelligently managed, is characterized in that, It includes a computer (01) with a PLC, an injection molding machine (02), a transfer device (03), a vacuum coating machine (04), a data acquisition and transmission module, production line equipment, movable equipment, other industrial control equipment, and a storage room; The data acquisition and transmission module includes data chips of intelligent equipment and various types of sensors used in the manufacturing and processing process, and conducts data transmission in the production scenario through the Bluetooth wireless communication protocol; The movable equipment includes a turnover rack (100) that circulates between the injection molding machine (02), the vacuum coating machine (04), and the storage room and is used for turning over and placing dinner plates (05) in the tableware; The number of dinner plates that can be carried by one turnover rack (100) is designed according to the number of products coated at one time. The data chips are detachably pasted on the turnover rack (100) according to batches. Thus, information such as how many batches an order is divided into, the working station information of each batch flowing in real time, the completed processes, the remaining processes, whether there is a production anomaly at the present stage or the anomalies that have occurred can be obtained in real time in the computer (01) through the data chips. With the support of the information of the data chips, the personnel and equipment in the workshop can accurately transfer the work-in-progress to the corresponding set processes in a timely manner; The turnover rack (100) includes a turnover rack central column (110) and multiple trays (120) movably sleeved on the turnover rack central column (110). The tray (120) includes an inner ring that is a circular ring, an outer ring that is a bone structure member (121) with several equally spaced placement spaces, and a supporting member (122) fixed on the bone structure member (121) and on each placement space; The tray (120) is used to receive the dinner plates (05) at the working station of the injection molding machine (02) and carry the dinner plates (05) into the coating tank during the vacuum coating machine (04) process. The tray (120) enters the turnover rack central column (110) from the top and exits from the bottom; The inner wall of the circular ring of the bone structure member (121) has an elastic bead (121A). At the position of the elastic bead, a triangular positioning plate (121B) with an arc extending upward from the upper end surface of the circular ring and having the same inner wall is provided. At the lower end surface of the circular ring, at the position corresponding to the positioning plate (121B), there is a notch (121C); The supporting member (122) includes a bottom large ring (122A) fixedly connected to the bone structure member (121), a top small ring (122B) located above the bottom large ring (122A), and is fixedly supported by several springs (122C) between the bottom large ring (122A) and the top small ring (122B). The upper surface of the top small ring (122B) is evenly spaced with three or more rotatable universal rolling balls (122D); The turnover rack central column (110) is integrally a circular tube, the outer diameter of which is the same as the inner diameter of the inner circular ring of the tray (120), and the outer surface has a concave surface (110A) running through the entire length along the axis, and this concave surface is used to accommodate the elastic bead (121A);The lower part of the center column (110) of the turnover rack has a damping section (111). Above the damping section (111) is a limit ring (112) detachably fixed to the center column (110) of the turnover rack. The lower end face of the center column (110) of the turnover rack has a connector (113). The vacuum coating machine (04) includes a vertical coating tank (41), a tank cover (42), a tubular fixture center column (43), and a mounting base (44) for fixedly installing the fixture center column (43). The transmission system is arranged in the tank cover (42) and has both revolution and rotation. The upper mouth part of the fixture center column (43) has a joint part (431) matching the connector (113). A threaded groove (432) surrounds the circumferential surface of the whole length. A plurality of round holes are arrayed in the threaded groove (432), and the range of the round holes basically covers the length of the whole threaded groove (432). A resistance and limit combination component (45) is installed in each round hole. The resistance and limit combination component (45) includes a T-shaped body (451) whose arc section has a shape and radian matching the cross-section of the threaded groove and whose straight section can move into the round hole in the threaded groove (432), an arc-shaped gasket (452) sleeved and connected, a compression spring (453), a blocking part (454) integrally formed with the T-shaped body (451), and a guiding inclined surface (455) at one end of the arc section of the T-shaped body (451) facing upward.

2. The plastic tableware manufacturing process control system according to claim 1, wherein The vacuum coating machine (04) further includes a driving rod (46) placed inside the fixture center column (43). The overall length of the driving rod (46) is basically the same as that of the fixture center column (43). A section near the lower end is a driving section (461) with a larger diameter. The size of the driving section (461) is set such that when it contacts the straight section end of the resistance and limit assembly (45), it can completely push it out beyond the thread groove (432). A quick connector (462) is provided near the upper end of the driving rod (46).

3. The plastic tableware manufacturing process control system according to claim 2, wherein The vacuum coating machine (04) further includes placing a connecting rod (47) with an overall length longer than that of the turntable center column (110) inside the turntable center column (110). The bottom of the connecting rod has a receiving joint connected to the quick connector (462).

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