Automatic starch tableware production device and method based on PLC control

Abstract

The invention discloses a starch tableware automatic production device and method based on PLC control. The device comprises a starch tableware production device and a PLC (Programmable Logic Controller) control system, the starch tableware production device comprises a tableware forming device, a pneumatic guide rail, a feeding device, a taking device, a sensor and a time relay; the PLC control system comprises a central processing unit, a memory, an input interface, an output interface and a power supply; the sensor is connected with the input interface; the high-pressure stamping mechanism, the first pneumatic driving device, the second pneumatic driving device and the suction cup driving device are all connected with the output interface. According to the invention, automatic control of starch tableware is realized by adopting a PLC control technology and a sensor technology, so that the requirement of manual intervention can be greatly reduced, and meanwhile, the quality and the stability of a product can also be improved. By means of the automatic production technology, mass production and popularization use of tableware are achieved, and the market competitiveness of small and medium-sized production enterprises is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of automatic control, and particularly relates to an automatic production device and method for starch tableware controlled by a PLC. Background Art

[0002] Due to the development of society, the demand in the fast food industry is increasing day by day. As a degradable food, corn starch tableware has received more and more attention. China has rich starch resources, with an annual output as high as 34 million tons. Therefore, through in-depth research on starch tableware, not only can resources be better utilized, but also it can play an important role in maintaining forest resources and the ecological environment, and promoting the sustainable development of China's environmental protection industry.

[0003] Currently, starch tableware is usually made by heating and forming with a molding machine. [5] However, in the whole production process, a large amount of manual labor is still required, including feeding, forming, and removing products. Many machines on the market still cannot achieve full automation, and there are certain defects in the current production process equipment. The present invention designs a series of tableware forming methods to automatically complete the processes of feeding, forming, and pushing out products, so as to achieve rapid production and improve production efficiency. It is of great significance to develop a fully automatic and integrated starch tableware automatic forming program from blanking to demoulding. Through the comprehensive transformation of the original production process, not only the labor cost is greatly reduced, but also the production efficiency is significantly improved, making outstanding contributions to the technological progress of China's disposable degradable tableware and the sustainable development of the industry.

[0004] Currently, on the basis of traditional functions, the PLC has added functions such as analog quantity operation, PID function, communication function, and more reliable industrial anti-interference technology, and is widely used in various fields of industrial production. According to different I / O point numbers, the PLC can be divided into small PLCs, medium PLCs, and large PLCs, which are widely distributed in various industrial sectors. PLC products are applied in fields such as iron and steel, petroleum, electric power, building materials, automobiles, machinery manufacturing, and transportation, including process industries and discrete industries. In addition, the PLC automation system controller also has good operation safety. It has a fast operation speed, can automatically detect the operation status of the system, discover possible faults and take timely measures to effectively prevent the occurrence of safety accidents. At the same time, it can also provide reliable protection measures to effectively ensure the safe operation of the system.

[0005] Currently, there is still a lack of an automatic production device for starch tableware based on PLC control. Summary of the Invention

[0006] To solve the above technical problems, the present invention provides a PLC-controlled automatic production device and method for starch tableware. The present invention aims to solve the problem of low efficiency of current starch tableware molding machines, and designs a completely automatic program using PLC technology to improve production efficiency. Through multiple practical analyses of the main parameters of starch tableware molding and in combination with simulation conditions, the present invention finally determines the optimal combination of high-temperature stamping parameters, where the temperature control of the upper die for high-temperature stamping is about 240 °C, and the temperature of the lower die is about 170 °C.

[0007] The technical solution provided by the present invention is as follows:

[0008] In the first aspect, the present invention provides a PLC-controlled automatic production device for starch tableware, including a starch tableware production device and a PLC control system;

[0009] The starch tableware production device includes a tableware molding device, a pneumatic guide rail, a feeding device, a material taking device, sensors, and a time relay; the tableware molding device includes a high-temperature stamping mechanism and a tableware mold; the feeding device includes a bottom plate, a movable plate provided with a falling port, and a first pneumatic driving device for correctly dropping the placed starch into the press molding machine; the material taking device includes a material taking main structure, a soft suction cup, a second pneumatic driving device, an air pump, and a material taking lifting driving device. The material taking lifting device is used to drive the material taking device to lift, the second pneumatic driving device is used to drive the material taking main structure to move horizontally, and the air pump is used to enable the soft suction cup to suck the starch tableware after high-temperature stamping from the press molding machine;

[0010] The sensors include a feeding device in-place position sensor, a feeding device reset position sensor, a material taking device in-place position sensor, a material taking device reset position sensor, a suction cup rising position sensor, a suction cup falling position sensor, a molding device rising position sensor, and a molding device falling position sensor; the PLC control system includes a central processing unit, a memory, an input interface, an output interface, and a power supply;

[0011] The sensors are connected to the input interface;

[0012] The high-pressure stamping mechanism, the first and second pneumatic driving devices, and the suction cup driving device are all connected to the output interface.

[0013] Furthermore, the tableware molding device includes a high-temperature stamping main body and a tableware mold; the tableware mold is a flat plate provided with a chamber for containing starch for the starch tableware; the high-temperature stamping main body is a cylindrical structure for stamping starch.

[0014] Further, the feeding device includes a feeding device bottom plate, a movable plate, and a feeding pneumatic guide rail; the movable plate is arranged in the feeding device bottom plate and is driven by a first pneumatic driving device, and the first pneumatic driving device is arranged on both sides of the movable plate to drive the horizontal movement of the movable plate; a falling opening for a single starch dough piece to fall is formed on the feeding device bottom plate; a hole position corresponding to the falling opening is formed on the movable plate.

[0015] Further, the main material taking structure includes a guide rail frame and a material taking plate arranged therein; the material taking plate is connected with a suction cup, and a second pneumatic driving device is arranged in the guide rail frame to drive the horizontal movement of the material taking plate.

[0016] Further, the position sensors include:

[0017] A feeding device in-place position sensor, arranged on the feeding plate base, for limiting the length of the feeding plate entering the tableware forming device;

[0018] A feeding device reset position sensor, arranged on the feeding plate base, for determining whether the feeding plate returns to its original position;

[0019] A forming device ascending or descending position sensor, respectively located at the upper end and the lower end of the tableware forming device, for judging whether the forming device ascends or descends;

[0020] A suction cup ascending or descending position sensor, respectively located on the material taking plate, for judging whether the suction cup is in the ascending or descending position;

[0021] A material taking device in-place position sensor, located on the main material taking structure, for judging whether the material taking device reaches the in-place position;

[0022] A material taking device reset position sensor, located on the main material taking structure, for judging whether the material taking device resets. Further, the input interfaces include:

[0023] I0.0, connected to the start switch, for starting the production device;

[0024] I0.1, connected to the stop switch, for stopping the production device;

[0025] I2.0, connected to a normally open contact as a reset switch for automated production;

[0026] I0.2, connected to the feeding device in-place position sensor at the raw material feeding point;

[0027] I0.3, connected to the feeding device reset position sensor at the raw material discharging point;

[0028] I0.4, connected to the forming device ascending position sensor for heating and ascending of the automated production mold;

[0029] I0.5, the forming device descending position sensor that resets after the automated production mold heating is completed;

[0030] I1.0, the feeding device in-place position sensor for the suction cup that picks up tableware and enters the mold;

[0031] I1.1, the suction cup descending position sensor that stops after the suction cup descends to the specified position;

[0032] I1.2, the suction cup ascending position sensor that resets the suction cup to the position when it enters;

[0033] I1.3, the feeding device reset position sensor for the final suction cup to exit the compression molding machine and reach the conveyor belt.

[0034] Furthermore, the output interfaces include: the feeding plate forward and return interfaces, the high-temperature tableware forming device ascending stamping and descending interfaces, the feeding plate forward and return interfaces, and the suction cup tightening and loosening interfaces.

[0035] Furthermore, the first pneumatic device is a pneumatic guide rail, arranged on both sides of the movable plate, driving the movable plate to horizontally move towards the tableware forming device; the second pneumatic device is a pneumatic guide rail, arranged on both sides of the feeding plate, driving the feeding plate to horizontally move towards the tableware forming device.

[0036] Furthermore, the suction cup driving device includes a pneumatic lifter and a vacuum pump, driving the suction cup to move up and down. After the suction cup descends and contacts the tableware, a vacuum is formed by the vacuum pump to automatically tighten the suction cup, thereby achieving the purpose of sucking starch tableware.

[0037] In a second aspect, the present invention provides a method for realizing automated production of the PLC-controlled starch tableware automated production device described in the first aspect, including the following steps:

[0038] (1) The feeding device senses the material input and starts to move. The material is placed in the square groove of the movable plate of the feeding device. The movable plate separates the materials from each other, and the movable plate blocks the tray falling opening to prevent the materials from falling out. The feeding device moves horizontally. When it reaches directly above the mold, the movable plate moves to the left to push down the material, and the material falls into the mold through the falling opening of the bottom plate under the action of gravity; after the material is pushed down, the feeding device withdraws from the die pressing area, moves horizontally to return to its original position, and at the same time the movable plate moves to the right to return to its original position, preparing for the next feeding;

[0039] (2) After the material falls, it senses that the feeding device withdraws from the die pressing area of the tableware forming device. Subsequently, the lower mold moves upward along the guide rail with the material and closes with the upper mold, applying pressure to the material and heating the material to form, heating and plasticizing; after the heating and plasticizing are completed, the lower mold returns to its original position along the guide rail, and the product moves with the lower mold;

[0040] (3) While the lower mold returns to its original position, the material taking device moves horizontally along the pneumatic guide rail to above the lower mold; after reaching directly above the lower mold, the soft suction cup device descends, bringing the suction cup into contact with the product. The suction cup pneumatically holds the tableware product. After the soft suction cup device holds the tableware product, it ascends, then returns to its original position along the guide rail, increases the air pressure between the suction cup and the product, causing the suction cup to release the product, and the product falls into the conveying device under the action of gravity for conveyance;

[0041] (4) Repeat steps (1) to (3) for the next production cycle.

[0042] The beneficial effects of the present invention are as follows:

[0043] (1) The present invention adopts PLC control technology and sensor technology to achieve the automatic control of starch tableware, which can greatly reduce the need for manual intervention and improve the quality and stability of products at the same time;

[0044] (2) The present invention utilizes automatic production technology to achieve the mass production and popular use of tableware, which can better meet the needs of the tableware supply chain in the catering market and improve the market competitiveness of small and medium-sized production enterprises.

[0045] (3) The automatic production device provided by the present invention has no three wastes discharge during the production process of starch tableware and does not pollute the environment, belonging to the green and pollution-free environmental protection products approved by the state.

[0046] (4) The device described in the present invention can cooperate with products such as frequency converters and servos, and combine with Internet of Things technology to achieve functions such as remote monitoring of PLC data and remote maintenance of PLC programs. Description of the Drawings

[0047] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for describing the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention, and those of ordinary skill in the art can obtain other drawings based on these drawings without creative efforts.

[0048] Figure 1 It is a schematic structural diagram of the feeding device;

[0049] Figure 2 It is a schematic structural diagram of the tableware forming device;

[0050] Figure 3 It is a schematic structural diagram of the sucking device;

[0051] Figure 4 It is a schematic overall structural diagram of the present invention;

[0052] Figure 5 It is an external wiring diagram of the PLC;

[0053] Figures 6 to 14 These are diagrams of various network connection relationships;

[0054] Figure 15 This is the production process flow chart of an automatic forming machine;

[0055] Figure 16 This is the operation flow chart of the entire production device;

[0056] The reference numerals are as follows:

[0057] 1. Bottom plate of the feeding device; 2. Movable plate; 3. Discharge opening; 4. Main body of the starch forming device; 5. Starch tableware mold; 6. Moving guide rail; 7. Main structure for material taking; 8. Soft suction cup; 9. Tableware forming device; 10. Feeding device; 11. Material taking device; 12. First pneumatic guide rail; 13. Second pneumatic guide rail; 14. In-place position sensor of the feeding device; 15. Reset position sensor of the feeding device; 16. In-place position sensor of the material taking device; 17. Reset position sensor of the material taking device; 18. Lifting device for material taking. Detailed implementation manners

[0058] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0059] Embodiment 1

[0060] An automatic production device for starch tableware controlled by a PLC includes a starch tableware production device and a PLC control system;

[0061] The starch tableware production device includes a tableware forming device 9, a feeding device 10, a material taking device 11, and sensors; the tableware forming device includes a high-temperature stamping main body 4 and a tableware mold; the feeding device 10 includes a bottom plate 1 of the feeding device, a movable plate 2, and a first pneumatic driving device; the material taking device 11 includes a main structure 7 for material taking, a soft suction cup 8, a second pneumatic driving device, a vacuum pump, and a lifting device 18 for material taking. The lifting device 18 for material taking is used to drive the material taking device 11 to lift, and the second pneumatic driving device is used to enable the soft suction cup 8 to suck the starch tableware after high-temperature stamping from the tableware forming device 9;

[0062] The sensors include a feeding device in-place position sensor 14, a feeding device reset position sensor 15, a material taking device in-place position sensor 16, a material taking device reset position sensor 17, a suction cup ascending position sensor, a suction cup descending position sensor, a forming device ascending position sensor, and a forming device descending position sensor.

[0063] The PLC control system includes a central processing unit, a memory, an input interface, an output interface, and a power supply;

[0064] The sensors are connected to the input interface;

[0065] The high-temperature stamping main body 4, the first and second pneumatic driving devices, and the material taking lifting device 18 are all connected to the output interface.

[0066] As a specific embodiment, the high-temperature stamping main body 4 includes a lower die and its positioning mechanism, an upper die and its positioning mechanism, a heating and pressing film device, and a moving guide rail. Tableware molds are provided on both the upper and lower dies. An entire high-temperature stamping plate has nine identical molds, capable of forming multiple products at one time. During pressing, the lower die moves upward along the guide rail driven by a motor using guide wheels and contacts the upper die, forming pressure in the mold cavity. At the same time, the heating and pressing film device heats to perform high-temperature pressing on the starch. After the material is put in, the feeding device 10 withdraws, the lower die moves upward along the guide rail, and after pressing the film, the lower device returns to its position, and the material taking device 11 enters to remove the product. A dual-mode heating system is adopted, and the upper and lower molds respectively achieve precise temperature control through special heating plates, so as to achieve the best heating effect.

[0067] As a specific embodiment, the feeding device 10 includes a feeding device bottom plate 1, a movable plate 2, and a first pneumatic guide rail 12; the movable plate 2 is arranged in the feeding device bottom plate 1 and is driven by the first pneumatic guide rail 12. The first pneumatic guide rail 12 is arranged on both sides of the feeding device bottom plate 1 to drive the bottom plate 1 to move horizontally; a falling opening for a single starch dough to drop is formed on the bottom plate 1; a hole corresponding to the falling opening is formed on the movable plate. Starch is added to the feeding device 10 from the feeding hopper. The hole position of the movable plate 2 of the feeding device 10 and the material discharging opening 3 of the bottom plate 1 are staggered. When the feeding device 10 moves above the corresponding tableware mold of the starch tableware production device, the first pneumatic guide rail 12 drives the movable plate 2 to move so that the hole position of the movable plate corresponds to the position of the material discharging opening 3, so that the starch falls into the tableware mold. The movement of the entire feeding device is sent into the tableware mold in a way driven by a guide rail.

[0068] As a specific embodiment, the material taking device 11 includes a material taking main structure, a soft suction cup 8, a second pneumatic driving device, a vacuum pump, and a material taking lifting device 18. The second pneumatic driving device is the second pneumatic guide rail 13, and the second pneumatic guide rail 13 is arranged on both sides of the material taking main structure to drive the base to move horizontally.

[0069] As an improved embodiment, the main material taking structure includes a guide rail frame and a material taking plate arranged therein; the material taking plate is connected with a suction cup, and a second pneumatic guide rail 13 is arranged in the guide rail frame.

[0070] As an improved embodiment, the material taking lifting device 18 is a pneumatic lifter, including a piston rod, a cylinder and an air pump, which has the same principle as a jack. The push rod is connected to the top surface of the material taking device. By adjusting the air pressure, the lifting of the push rod is controlled to make the whole material taking device 11 lift. The material taking lifting device 18 is connected with the interface I1.1. After the suction cup descends to the designated position and gives a signal, the suction cup is automatically tightened under the action of a vacuum pump to achieve the purpose of sucking starch tableware.

[0071] As a specific embodiment, the material taking device 11 is supported by a hanging device, and the hanging device includes a base and a cross arm. The material taking lifting device 18 is connected to the cross arm. The material taking lifting device 18 adjusts the height, and the second pneumatic driving device drives the main material taking structure into the tableware forming device.

[0072] As a specific embodiment, the position sensors include:

[0073] The in-feed device in-place position sensor 14 is arranged at the left end of the base of the in-feed plate and is used to limit the length of the in-feed plate entering the tableware forming device;

[0074] The in-feed device reset position sensor 15 is arranged at the right end of the base of the in-feed plate and is used to determine whether the in-feed plate returns to its original position;

[0075] The forming device ascending or descending position sensors are respectively located at the upper end and the lower end of the tableware forming device to judge whether the forming device is in the ascending or descending position;

[0076] The suction cup ascending or descending position sensors are respectively located on the material taking plate and are used to judge whether the suction cup is in the ascending or descending position; the material taking device in-place position sensor is located on the main material taking structure and is used to judge whether the material taking device is in place;

[0077] The material taking device reset position sensor is located on the main material taking structure and is used to judge whether the material taking device is reset.

[0078] As a specific embodiment, the input interfaces include:

[0079] I0.0, connected to the start switch and used to start the production device;

[0080] I0.1, connected to the stop switch and used to stop the production device;

[0081] I2.0, connected to a normally open contact as a reset switch for automatic production;

[0082] I0.2, the in-place position sensor of the feeding device connecting to the raw material feeding point;

[0083] I0.3, the reset position sensor of the feeding device connecting to the raw material discharging point;

[0084] I0.4, the rising position sensor of the forming device connecting to the heating and rising of the automated production mold;

[0085] I0.5, the descending position sensor of the forming device connecting to the reset after the heating of the automated production mold is completed;

[0086] I1.0, the in-place position sensor of the material taking device where the suction cup for sucking tableware enters the mold;

[0087] I1.1, the descending position sensor of the suction cup connecting to the stop after the suction cup descends to the specified position;

[0088] I1.2, the rising position sensor of the suction cup connecting to the reset of the suction cup to the position when it enters;

[0089] I1.3, the reset position sensor of the material taking device where the final suction cup exits the press and reaches the conveyor belt.

[0090] As a specific embodiment, the output interfaces include: the forward and return interfaces of the feeding plate along the pneumatic guide rail, the rising, stamping and descending interfaces of the high-temperature tableware forming device along the guide rail, the forward and return interfaces of the material taking plate along the pneumatic guide rail, the up and down movement interface of the material taking plate, and the suction interface of the suction cup.

[0091] As a specific embodiment, this embodiment uses the CTH200 series CPU H226L as the main control element module, which has excellent programmability and can meet the automation detection, monitoring and control requirements of all walks of life, and can exert the best performance in a variety of scenarios.

[0092] As a specific embodiment, a time relay is built into the PLC system of this application for time control, such as heating time, pressing time, etc. In order to realize the automatic feeding of starch dough for the tableware forming device, the feeding device is sent above the mold through the guide rail and the starch dough is accurately placed. The present invention uses the first pneumatic guide rail 12 to send the feeding device into the tableware forming device, and fixes the depth of the feeding device sent into the tableware forming device according to the position sensor, and finally returns to the original position of the pneumatic guide rail. The components required are: the raw material discharge contactor, the raw material feed contactor. And after the high-temperature stamping of the starch tableware is completed, the material taking device also uses the second pneumatic guide rail 13 to send the material taking device into the tableware forming device, and then controls the up and down movement of the material taking device through the up and down movement contactor of the suction cup above to complete the suction and reset of the starch tableware.

[0093] Example 2

[0094] A method for realizing the automatic production of starch tableware by using the PLC-controlled automatic production device for starch tableware in Example 1 is as follows:

[0095] When the button is pressed, the machine starts to carry the starch mass into the feeding device and waits until the feeding instrument advances forward and touches the feeding position sensor and then stops. The starch dough is pushed into the tableware forming device. When the entire feeding device completes the feeding action, the entire feeding device withdraws. The tableware forming device starts to operate. The tableware forming device presses through the upper and lower molds rising and the upper mold, and presses the starch dough into shape by high temperature. After 30 s of pressing time, the mold descends. At this time, the picking instrument enters from the side and sucks out the finished starch tableware from the mold by air pressure and places it on the discharge conveyor belt, realizing the automatic processing of the entire starch tableware. It is required that the PLC control system realizes the one-key start and stop of the starch tableware manufacturing and sets an emergency stop button to ensure the safety of mechanical processing. Through the research on the operating principle of the automatic molding machine, its production process flow chart can be drawn, as Figure 16 shown.

[0096] Step 2: Determine the input / output devices of the PLC control system

[0097] Allocating resources involves determining the input and output points, determining the corresponding function buttons, and describing the uses of these buttons. Table 3.0 clearly shows the various resource allocation situations of the PLC system, including time relays and other devices. To make the resource allocation more explicit, the content in the table provides a reference.

[0098] Table 3.0 I / O terminal control function table

[0099]

[0100]

[0101] Step 3: Design the peripheral hardware circuit according to the I / O point control function table.

[0102] Design the external wiring diagram of the PLC according to the I / O terminal control function table in Table 3.0, as Figure 5 shown. Among them, the current of the control switch is 24 V, and Y0 to Y8 are 8 relays to receive the corresponding of the travel switch, and the current used is 220 V.

[0103] Among them, KM1 to KM9 are the 9 output relays. The starting basis is the position sensors at each position. When the position sensor at a specific position receives a start command, the corresponding relay starts, promoting the further operation of the entire automatic control system. Specifically, KM1-KM2 and KM5-KM9 start the pneumatic guide rail, enabling the feeding plate / material taking plate to enter the tableware forming device for corresponding operations and finally return to the original position. KM3 starts the stamping step of the lower part of the tableware forming device, enabling it to rise to a certain height to complete the high-temperature stamping and forming process of the starch tableware. KM4 returns the tableware forming device to the original position and waits for the next processing. KM5 controls the advancement of the material taking device. When KM5 starts, the second pneumatic guide rail starts to operate to push the material taking device forward; KM6 controls the descent of the material taking device. When KM6 starts, the material taking lifting device 18 starts to operate to control the entire material taking device to move downward; KM7 controls the suction of the suction cup. When KM7 starts, the air pump starts to act, and the suction cup starts to suck tightly to achieve the effect of sucking the starch tableware; KM8 controls the ascent of the material taking device. When KM8 starts, the material taking lifting device 18 starts to operate to control the entire material taking device to move upward; KM9 controls the reset of the material taking device. When KM9 starts, the pneumatic guide rail starts to operate to push the material taking device backward to the original position.

[0104] Step 4: Program Design

[0105] The working process of the present invention is as follows, as Figure 15 shown: When the machine starts running, after the material is placed on the feeding device, the feeding device tray transports the material. The feeding device moves to the position of the die pressing device, and the movable plate 2 pushes down the material. After the material falls into the tableware forming device, the lower die of the tableware forming device moves upward to close with the upper die. After heating and forming for 30 s, the lower die returns to the original position. The material taking device enters the die machine, sucks the starch tableware with the suction cup, and moves the product above the conveyor belt and releases the suction cup. The suction time is 1 s, and the product falls onto the conveyor belt, and the conveyor belt transports the product away. This involves multiple fixed-point positions, and after completing the previous step, the next step needs to be carried out immediately for processing. Therefore, a trigger is required between each step to achieve its coherence. A corresponding position sensor is set near the point where each section finally arrives to meet the requirement. When the position sensor is triggered, its input signal is transmitted to the next network, and then the following process is carried out. The specific operation content is as follows:

[0106] As shown in Network 1, the normally open contacts of I0.0, Q0.0, and T39 are connected in parallel and then successively connected in series with the normally closed contacts of I0.1, I0.2, the normally open contact of M2.0, the normally closed contact of I2.0, and the coil of Q1.0. Among them, the normally open contact of I0.0 is the start switch, and the normally open contact of T39 is a time relay. Its main function is to start timing, enabling the automated production line of starch tableware to continue working after completing one round until the total stop switch of the normally closed contact of I0.1 is pressed to stop. The coil of Q0.0 is the intermediate relay KM1 for the feeding plate to enter. First, when the starch dough enters between the bottom plate and the movable plate, since the falling port is blocked, it cannot fall. At this time, when KM1 starts to operate and runs along the first pneumatic guide rail, when it reaches the specified position, the position sensor at I0.2 sends an arrival instruction, and KM1 stops, and the feeding plate no longer advances. At this time, due to inertia, the movable plate starts to move forward, causing the starch dough to be continuously pushed into the falling port.

[0107] Network 2 is the emergency interruption switch for Network 3. The normally closed contacts of Q1.0, Q2.0, and the coil of M2.0 are successively connected in series to prevent the feeding tray from moving and colliding when the machine is heating and the suction cup enters the machine to pick up the starch tableware.

[0108] Network 3, the normally open contact of I0.2, the normally closed contact of I0.3, and the coil of M0.0 are successively connected in series. Among them, I0.2 is the position sensor for the raw material feeding plate to reach the specified position inside the tableware forming device. When KM1 starts to run, the intermediate relay M0.0 of the raw material feeding plate starts to run. When the feeding plate finally retracts and resets, I0.3 becomes normally open, causing Network 3 to lose power.

[0109] Network 4, the normally open contact of M0.0 is connected in parallel with the normally open contact of Q0.1 and then successively connected in series with the normally closed contacts of I0.1 and I0.3. The normally open contact of I2.0 is connected in parallel with it. Network 4 is the program for the starch dough to enter the processing area position. Since the normally open contact of M0.0 receives the signal that the starch dough has successfully fallen into the tableware forming device, after KM2 receives the input signal, it starts to run, causing the entire feeding plate to retract to its original position. Among them, the normally open contact of Q0.1 has self-locking until the position sensor of the normally closed contact of I0.3 sends an arrival instruction and KM2 stops, and the feeding plate no longer retracts.

[0110] Network 5, the normally open contact of I0.3 is connected in series with the coil of M0.1. Among them, I0.3 is the output signal sent when the raw material feeding plate exits to the outside of the tableware forming device and reaches the original position before operation. At this time, the machine has retracted to the specified position and transmitted its signal to the coil of M0.1, ending this link.

[0111] Similarly, Network 6 and Network 9 are when the main machine starts to run after the feeding tray exits, preparing for the high-temperature stamping and forming step of the starch dough.

[0112] In Network 6, the normally open contact of M0.1 and the normally open contact of Q1.0 are in parallel and then serially connected to the normally closed contact of I0.1, the normally open contact of M2.1, the normally closed contact of I2.0, and the coil of Q1.0 in sequence. This network means that when the system receives the open signal from the reset position sensor I0.3 of the feeding device, the coil of M0.1 is energized, then the contactor Q1.0 is energized and self-locked, and the heating die lifting contactor starts, and begins to perform high-temperature stamping on the starch dough. In the whole network, I0.1 is the emergency stop button, and M2.1 is a protective measure to prevent the entire system from malfunctioning and causing the failure of multiple devices to enter the high-temperature main body simultaneously. I2.0 is the reset button, which enables the entire machine to be reset by pressing the reset button after a power outage.

[0113] Network 7 is to set the specific heating time of the starch dough to 30 s. The normally open contact of I0.4, the normally closed contact of Q1.1, the normally closed contact of I0.1, and the time relay T37 are serially connected in sequence, that is, the timing starts after the raw material reaches the specified position.

[0114] In Network 8, the normally closed contact of Q0.0, the normally closed contact of Q2.0, the normally closed contact of I0.4, and the intermediate relay M2.1 are serially connected. This network plays a protective role in the whole process to prevent other devices from operating simultaneously when heating the high-temperature main body, or when the suction cup device enters or the material taking device enters, causing the entire equipment to malfunction.

[0115] Network 9 is the process of the starch dough exiting the device after processing and forming. It stops running Network 10 after reaching the specified position. Among them, the normally open contact of T37 and the normally open contact of Q1.1 are in parallel and then serially connected to the normally closed contact of I0.1 and the normally closed contact of I0.5 in sequence. The normally open contact of I2.0 is in parallel with the main circuit. Similarly, I2.0 is the reset button, which enables the entire machine to be reset by pressing the reset button after a power outage.

[0116] Similarly, in Network 10, the normally open contact of I0.5, the normally closed contact of Q3.0, and the intermediate relay M0.2 are serially connected. After the machine descends to the position specified by the position sensor, when the system receives the signal I0.5 and is energized, the intermediate relay M0.2 is energized, and Network 11 starts.

[0117] In Network 11, the normally open contact of M0.2 and the normally open contact of Q2.0 are in parallel, and then serially connected to the normally closed contact of I0.1, the normally closed contact of I1.0, the normally open contact of M2.2, the normally closed contact of I2.0, and the coil of Q2.0 in sequence. This network starts after the coil of M0.2 is energized due to receiving the signal that the die machine descends to the position sensor in Network 10. Q2.0 is energized and self-locked, KM5 starts, and the feeding device starts to move forward until I1.0 is energized after receiving the signal of the forward contactor of the material taking device, and the coil of Q2.0 is de-energized.

[0118] Similarly, what is described by network 12.13.14.15 is that after the instrument reaches the designated position of the position sensor, the next link starts to run.

[0119] For network 12, the normally closed contacts of Q0.0, Q1.0, Q2.1, Q3.0, Q3.1, and the intermediate relay M2.2 are connected in series in turn. This network is also a protection program in the system to prevent multiple device movements in the whole device from causing failures.

[0120] For network 13, the normally open contact of I1.0, the normally closed contact of Q2.2, and the intermediate relay M0.3 are connected in series in turn. This network receives the signal from the in-position sensor of the material taking device and transmits the input device to M0.3.

[0121] For network 14, the normally open contact of M0.3 is in parallel with the normally open contact of Q2.1, and then in series with the normally closed contacts of I0.1, I1.1, I2.0, and the coil of Q2.1. When the signal of the normally open contact of M0.3 in network 13 is received, the coil of Q2.1 starts and self-locks, enabling KM6 to operate and the material taking device to start descending.

[0122] For network 15, I1.1, Q3.0, and M0.4 are connected in series in turn. This network receives the signal from the reset position sensor of the material taking device and transmits the input signal to M0.4.

[0123] For network 16, the normally open contact of M0.4 is in parallel with the normally open contact of Q2.2, and then in series with the normally closed contact of T38, the normally closed contacts of I0.1, I2.0, and the coil of Q2.2 in turn. The start signal of this network is the normally open contact of M0.4, that is, when the signal of the sucker descending in place is received, the coil of Q2.2 starts and self-locks, KM7 starts, and the sucker sucks the processed tableware tightly under the action of the air pump.

[0124] In network 17, the normally open contact of Q2.2, the normally closed contact of Q3.0, and the intermediate relay M0.5 are connected in series in turn. This network times the time for sucking the finished starch tableware, and after completion, continues to retract the instrument according to the position sensor.

[0125] As above, networks 18, 19, 20, and 21 are all programs for the next link to run after the sucker instrument reaches the designated position of the position sensor.

[0126] Network 18, the normally open contacts of M0.5, T38, and Q3.0 are in parallel, and then are successively in series with the normally closed contact of I0.1, the normally open contact of M2.3, and the normally closed contact of T39. The normally open contact of I2.0 is in parallel with the main circuit. This network is the program for the material taking device to start retracting and rising after the material taking is completed. Due to receiving the signal of the intermediate relay M0.5, the coil of Q3.0 is started and self-locked, causing KM8 to operate, and the material taking device starts to rise and retract.

[0127] Network 19, the normally closed contacts of Q0.0, Q1.0, Q2.1, Q2.0, Q3.1, and the intermediate relay M2.3 are successively in series. This network is also the protection program in the system to prevent other mechanical components from operating simultaneously and causing failures when the suction cup advances and retreats the machine body.

[0128] Network 20, the normally open contact of I1.2, the normally closed contact of I0.0, and the intermediate relay M0.6 are successively in series. This network receives the signal of the suction cup rising position sensor, and after receiving it, the intermediate relay M0.6 is started.

[0129] Network 21, the normally open contacts of M0.6 and Q3.1 are in parallel, and then are in series with the normally closed contact of I0.1 and the normally closed contact of I1.3. The normally open contact of I2.0 is in parallel with the main circuit. This network is the program for the material taking device to retract and reset. Due to receiving the signal of the intermediate relay M0.6 in Network 20, the coil of Q3.1 is started and self-locked, causing KM9 to operate, and the material taking device starts to retract.

[0130] Network 22, the normally open contact of I1.3, the normally closed contact of I0.0, and the intermediate relay M0.7 are successively in series. The normally open contact of I1.3 in Network 22 means that the material taking plate has retracted to the specified position above the conveyor belt. It is the air pressure to release the suction cup of the starch tableware finished product, place the finished product on the conveyor belt, and transmit this signal to the intermediate relay M0.7.

[0131] Network 23, the normally open contact of Q2.1, the normally closed contact of Q2.3, the normally closed contact of I0.1, and the time relay T38 are successively in series. Network 23 is set to have the suction cup hold the tableware for 2 seconds. After 2 seconds, the suction relay is powered off, causing the starch tableware to fall onto the conveyor belt.

[0132] Network 24, the normally open contact of M0.7, the normally closed contact of Q0.0, the normally closed contact of I0.1, and the time relay T39 are successively in series. The intermediate relay M0.7 in Network 24 is actually the input information received in Network 22 that the I1.3 suction cup has retracted to its original position. This input information is transmitted to the intermediate relay M0.7, which then controls the T39 time timer. After 2 seconds of timing, the time relay T39 is powered on again to start Network 1 for the next cycle.

[0133] As described above, it is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any modification, equivalent replacement, improvement, etc. made by those skilled in the art within the technical scope disclosed by the present invention shall be included within the scope of protection of the invention.

Claims

1. An automated production device for starch tableware controlled by a PLC, characterized in that, It includes a starch tableware production device and a PLC control system; The starch tableware production device includes a tableware forming device, a pneumatic guide rail, a feeding device, a material taking device, sensors and a time relay; the tableware forming device includes a high-temperature stamping mechanism and a tableware mold; the feeding device includes a feeding device bottom plate, a movable plate provided with a falling port and a first pneumatic driving device, which is used to correctly drop the placed starch into the pressing and forming machine; the material taking device includes a material taking main structure, a soft suction cup, a second pneumatic driving device, an air pump and a material taking lifting driving device. The material taking lifting device is used to drive the material taking device to lift, the second pneumatic driving device is used to drive the material taking main structure to move horizontally, and the air pump is used to make the soft suction cup suck the starch tableware after high-temperature stamping from the pressing and forming machine; The sensors include a feeding device in-place position sensor, a feeding device reset position sensor, a material taking device in-place position sensor, a material taking device reset position sensor, a suction cup rising position sensor, a suction cup falling position sensor, a forming device rising position sensor and a forming device falling position sensor; The PLC control system includes a central processing unit, a memory, an input interface, an output interface and a power supply; The sensors are connected to the input interface; The high-pressure stamping mechanism, the first and second pneumatic driving devices and the suction cup driving device are all connected to the output interface.

2. The PLC-controlled automatic production device for starch tableware according to claim 1, wherein, The tableware forming device includes a high-temperature stamping main body and a tableware mold; the tableware mold is a flat plate provided with a chamber for containing starch for the starch tableware; the high-temperature stamping main body is a columnar structure for stamping starch.

3. The PLC-controlled automatic production device for starch tableware according to claim 1, wherein The feeding device includes a feeding device bottom plate, a movable plate and a feeding pneumatic guide rail; the movable plate is arranged in the feeding device bottom plate and is driven by a first pneumatic driving device. The first pneumatic driving device is arranged on both sides of the movable plate to drive the movable plate to move horizontally; a falling port for a single starch dough to drop is opened on the feeding device bottom plate; a hole corresponding to the falling port is opened on the movable plate.

4. The PLC-controlled automatic starch tableware production device according to claim 1, wherein The material taking main structure includes a guide rail frame and a material taking plate arranged therein; the material taking plate is connected to the suction cup, and the second pneumatic driving device is arranged in the guide rail frame to drive the material taking plate to move horizontally.

5. The PLC-controlled automatic production device for starch tableware according to claim 1, characterized in that, The position sensors include: The feeding device in-place position sensor, arranged on the feeding plate base, is used to limit the length of the feeding plate entering the tableware forming device; The feeding device reset position sensor, arranged on the feeding plate base, is used to determine whether the feeding plate returns to its original position; The forming device rising or falling position sensor, located at the upper and lower ends of the tableware forming device respectively, is used to judge whether the forming device rises or falls; The suction cup rising or falling contactor, located on the material taking plate respectively, is used to judge whether the suction cup is in the rising or falling position; The material taking device in-place position sensor, located on the material taking main structure, is used to judge whether the material taking device is in place; The material taking device reset position sensor, located on the material taking main structure, is used to judge whether the material taking device is reset.

6. The PLC-controlled automatic starch tableware production device according to claim 1, wherein, The input interface includes: I0.0, connected to the start switch, is used to start the production device; I0.1, connected to the stop switch, is used to stop the production device; I2.0, connected to the normally open contact, is the reset switch for automatic production; I0.2, the in-place position sensor of the feeding device connecting the raw material feeding point; I0.3, the reset position sensor of the feeding device connecting the raw material discharging point; I0.4, the rising position sensor of the forming device connecting the heating and rising of the automatic production mold; I0.5, the descending position sensor of the forming device connecting the reset after the automatic production mold finishes heating; I1.0, the in-place position sensor of the material taking device where the suction cup for sucking tableware enters the mold; I1.1, the descending position sensor of the suction cup connecting the stop after the suction cup descends to the specified position; I1.2, the rising position sensor of the suction cup connecting the reset of the suction cup to the position when it enters; I1.3, the reset position sensor of the material taking device connecting the final suction cup exiting the compression molding machine and reaching the conveyor belt.

7. The PLC-controlled automated production device for starch tableware according to claim 1, characterized in that, The output interfaces include: the forward and return interfaces of the feeding plate, the rising stamping and descending interfaces of the high-temperature tableware forming device, the forward and return interfaces of the material taking plate, and the suction and release interfaces of the suction cup.

8. The PLC-controlled automatic production device for starch tableware according to claim 1, wherein, The first pneumatic device is a pneumatic guide rail, arranged on both sides of the movable plate, driving the movable plate to horizontally move towards the tableware forming device; the second pneumatic device is a pneumatic guide rail, arranged on both sides of the material taking plate, driving the material taking plate to horizontally move towards the tableware forming device.

9. The PLC-controlled automatic production device for starch tableware according to claim 1, characterized in that, The material taking lifting device is a pneumatic lifter, driving the entire material taking device to move up and down. After the suction cup descends and contacts the formed tableware, a vacuum is formed by the air pump to automatically suck the suction cup tightly, so as to achieve the purpose of sucking the starch tableware.

10. A method for realizing automatic production by using an automatic production device for starch tableware controlled by a PLC as described in any one of claims 1-9, characterized in that, It includes the following steps: (1) The feeding device senses the start of material input and starts to move. The material is placed in the square groove of the movable plate of the feeding device. The materials are separated from each other under the block of the movable plate. The movable plate blocks the tray falling opening to prevent the materials from falling out. The feeding device moves horizontally. When it reaches directly above the mold, the movable plate moves to the left to push down the material. The material falls into the mold through the falling opening of the bottom plate under the action of gravity; after the material is pushed down, the feeding device withdraws from the die pressing area and moves horizontally to return to its position. During the movement, the movable plate moves to the right to return to its position, preparing for the next feeding; (2) After the material falls, it senses that the feeding device exits the die pressing area of the tableware forming device. Subsequently, the lower mold moves upward along the guide rail with the material and closes with the upper mold, applying pressure to the material and heating the material to form at the same time, heating and plasticizing; after the heating and plasticizing is completed, the lower mold returns to its original position along the guide rail, and the product moves with the lower mold; (3) While the lower mold returns to its position, the material taking device moves horizontally along the pneumatic guide rail to directly above the lower mold; after reaching directly above the lower mold, the soft suction cup device descends, contacts the product with the suction cup, the suction cup pneumatically sucks the tableware product, the soft suction cup device sucks the tableware product and then ascends, and then returns to its original position along the guide rail, increasing the air pressure between the suction cup and the product to make the suction cup release the product, and the product falls into the conveying device under the action of gravity for conveying; (4) Repeat steps (1) to (3) for the next production cycle.

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