Production injection molding process of degradable plastic tableware

Abstract

The application relates to the technical field of plastic tableware production, in particular to a production injection molding process of degradable plastic tableware; the process comprises the following steps: S1: raw materials are put into a stirrer by a user for stirring to obtain a degradable mixture, and then the degradable mixture is added into an injection molding machine to be melted and injected into a molding mold; S2: a cooling system is controlled to cool and solidify the product in the molding mold; through the arrangement of the cutting plate, the cutting plate can cut and separate the degradable plastic table spoons in a circular array; therefore, the staff does not need to manually split the degradable plastic table spoons in a circular array, the staff can directly pack the cut table spoons, the labor intensity of the staff is reduced, the packing efficiency of the staff is improved, the staff is prevented from excessively splitting the table spoons, the table spoons are prevented from being damaged, such as being broken or cracked, the product quality of the degradable table spoons is improved, and the practicability of the application is improved.

Description

Technical Field

[0001] This invention relates to the field of plastic tableware production technology, specifically to an injection molding process for producing biodegradable plastic tableware. Background Technology

[0002] Biodegradable plastics are plastic materials that can be decomposed by microorganisms in the natural environment under certain conditions, degrading into non-toxic and harmless substances. Compared with traditional plastics, biodegradable plastics have a shorter lifespan in the environment, reducing their impact on the environment. Furthermore, with increasing public awareness of environmental protection and the growing prominence of plastic pollution in the surrounding environment, the market prospects for biodegradable tableware are very broad. Especially in industries such as catering, biodegradable tableware is widely used. Although most industries use more disposable biodegradable tableware, restaurants and other establishments also choose to provide non-disposable biodegradable tableware to their customers. Compared to disposable biodegradable tableware, non-disposable tableware can be recycled multiple times in an economical environment, effectively extending its service life and reducing the waste of raw materials.

[0003] As a type of tableware used to hold food and facilitate eating, the biodegradable raw materials for producing spoons include bamboo fiber and polylactic acid (PLA). Bamboo fiber is made from bamboo through chemical or mechanical treatment to produce cellulose fibers. The bamboo fiber is then combined with polylactic acid (PLA) to form a mixture that can produce biodegradable spoons. This biodegradable mixture is then added to an injection molding machine, where it is melted and injected into a mold. Once the mold is full, a cooling system is used to cool and solidify the product inside the mold, resulting in the desired biodegradable plastic spoon.

[0004] Existing spoon injection molds contain multiple cavities arranged in a circular array, each capable of molding a spoon. This circular array of plastic spoons effectively utilizes the space of the injection mold, improving the manufacturing efficiency of the finished spoons. Furthermore, the handles of the multiple spoons in the circular array are interconnected, making it convenient for a robotic arm to remove all the spoons from the mold after injection molding. However, the removed spoons still need to be manually disassembled by workers before they can be packed and transported. This manual disassembly not only increases the workload of workers and reduces the speed of packing, but also increases the risk of workers using excessive force when disassembling the spoons, causing them to break or crack.

[0005] In view of this, in order to overcome the above-mentioned technical problems, the present invention proposes an injection molding process for the production of biodegradable plastic tableware, which solves the above-mentioned technical problems. Summary of the Invention

[0006] To overcome the shortcomings of existing technologies, this invention proposes an injection molding process for producing biodegradable plastic tableware. This invention utilizes a cutting board that can separate a circular array of biodegradable plastic spoons, eliminating the need for manual separation and allowing workers to directly pack the cut spoons. This not only reduces labor intensity and improves packing efficiency but also prevents excessive force during separation, thus preventing breakage or damage and improving the product quality of the biodegradable spoons. This enhances the practicality of the invention.

[0007] The technical solution adopted by this invention to solve its technical problem is: a biodegradable plastic tableware production injection molding process according to this invention, comprising the following steps:

[0008] S1: The user selects 30-50 parts of polylactic acid, 5-8 parts of bamboo fiber, 2-3 parts of compatibilizer and 1-2 parts of heat stabilizer and puts them into a mixer to stir to obtain a biodegradable mixture. The biodegradable mixture is added to an injection molding machine to melt and then injected into the molded mold with the fixed mold and the moving mold closed.

[0009] S2: Control the cooling system to cool the molding die, so that the product inside the molding die cools and solidifies, thereby obtaining a circular array of biodegradable plastic spoons; then control the hydraulic push rod to pull the moving die and the fixed die apart;

[0010] S3: At this time, the external robotic arm is controlled to extend between the moving mold and the fixed mold, take out the circular array of biodegradable plastic spoons and transport them to the worktable, so that the circular array of biodegradable plastic spoons is fitted onto the support rod of the worktable, and the biodegradable plastic spoons are stacked between two adjacent limiting plates.

[0011] S4: When the biodegradable plastic spoons in the circular array are stacked to a certain number, the control drive module moves the worktable to the cutting plate to cut off the part of the spoon handle connected by injection molding. At this time, the user can directly pull out the spoons stacked between two adjacent limiting plates and pack them into boxes.

[0012] The injection molding machines used in S1-S4 include:

[0013] The machine body, a molding die mounted on the upper part of the machine body, and an injection molding machine located on one side of the molding die; the molding die includes a fixed die and a moving die; the fixed die is fixedly connected to the upper part of the machine body; the moving die is fixedly connected to the machine body via a hydraulic push rod; the injection molding machine is connected to the fixed die;

[0014] The worktable has an annular groove at the upper end of the machine body; the annular groove is located at the end of the machine body away from the injection molding machine; the worktable is slidably installed in the annular groove; a support rod and a limiting plate are fixedly installed at the upper end of the worktable; a cutting plate is provided at the upper end of the worktable; the end of the cutting plate away from the worktable is fixedly connected to the machine body through an electric push rod.

[0015] A drive module is installed at the lower end of the machine body; the drive module is used to drive the worktable to slide within the annular groove.

[0016] Preferably, the drive module includes a drive belt; the worktable is rotatably mounted on the upper end of the drive belt; the drive belt is slidably connected in an annular groove; the inner wall of the drive belt is provided with toothed grooves; a transmission gear is rotatably mounted on the lower end of the machine body; the transmission gear meshes with the drive belt; a drive motor is fixedly mounted on the lower end of the machine body; the output end of the drive motor is connected to the transmission gear through a transmission unit; the drive motor drives the transmission gear to rotate through the transmission unit.

[0017] Preferably, the transmission unit includes a transmission rod; the output end of the drive motor has a groove; the transmission rod is slidably connected in the groove; the lower end of the transmission gear has a circular groove; the end of the transmission rod away from the drive motor is connected to the circular groove through a connecting unit; a bevel gear ring is fixedly connected to the surface of the transmission rod; a bevel gear shaft is rotatably mounted on the lower end of the drive belt; the bevel gear shaft is fixedly connected to the worktable; and the bevel gear ring meshes with the bevel gear shaft.

[0018] Preferably, the connecting unit includes an electromagnet; the bottom of the circular groove has a square groove; the electromagnet is embedded in the bottom of the square groove; a push spring is provided between the transmission rod and the bottom of the square groove; one end of the push spring is rotatably connected to the transmission rod; the other end is fixedly connected to the bottom of the square groove.

[0019] Preferably, the connecting unit includes a connecting block; the connecting block is fixedly connected to the transmission rod; the inner wall of the circular groove is provided with a spiral groove and a circular groove; the spiral groove and the circular groove are connected; the transmission rod is slidably connected in the spiral groove through the connecting block.

[0020] Preferably, the upper end of the worktable is provided with a strip groove; the support rod is slidably connected in the strip groove; a screw is rotatably connected in the strip groove; the threads at both ends of the screw are in opposite directions; the support rod is helically connected to both ends of the screw; and a handwheel fixed to the screw is rotatably connected to the side wall of the worktable.

[0021] Preferably, a groove is provided on the side of two adjacent limiting plates that are close to each other, extending through to the upper surface of the limiting plate; a grinding plate is slidably connected in the groove.

[0022] Preferably, a push plate is slidably connected within the chute; the push plate is fixedly connected to the bottom of the chute by a fixing spring.

[0023] The beneficial effects of this invention are as follows:

[0024] This invention utilizes a cutting board that allows for the separation of a circular array of biodegradable plastic spoons. This eliminates the need for manual separation by workers, enabling direct packing of the cut spoons. This not only reduces labor intensity and increases packing efficiency but also prevents excessive force during separation, thus preventing breakage or damage and improving the quality of the biodegradable spoons. This enhances the practicality of the invention.

[0025] This invention utilizes the combination of a spiral groove and a circular groove, enabling a forward-rotating drive motor to drive a transmission rod and a connecting block into the spiral groove. This increases the rotation of the transmission gear by pushing the bottom of the spiral groove. Conversely, a reverse-rotating drive motor drives the connecting block on the surface of the transmission rod into the circular groove, thereby driving the bevel gear shaft to rotate the worktable. This eliminates the need for an electromagnet, reducing the energy consumption of this invention. It not only reduces energy waste but also lowers the cost of electricity, further enhancing the practical application effect of this invention. Attached Figure Description

[0026] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0027] Figure 1 This is a perspective view of the present invention;

[0028] Figure 2 This is a top view of the present invention;

[0029] Figure 3 yes Figure 2 Enlarged view of point A in the middle;

[0030] Figure 4 yes Figure 2 Enlarged view of point B in the middle;

[0031] Figure 5 This is a schematic diagram of the structure of the present invention with an electromagnet installed;

[0032] Figure 6 yes Figure 5 Enlarged view of point C in the middle;

[0033] Figure 7 This is a schematic diagram of the structure of the present invention with a spiral groove;

[0034] Figure 8 yes Figure 7 Enlarged view of point D in the middle;

[0035] Figure 9 This is a process flow diagram of the present invention;

[0036] In the diagram: 1. Machine body; 11. Molding mold; 111. Fixed mold; 112. Moving mold; 113. Hydraulic push rod; 12. Injection molding machine; 13. Annular groove; 131. Drive belt; 132. Gear groove; 14. Cutting plate; 141. Electric push rod; 15. Transmission gear; 16. Drive motor; 161. Groove; 17. Transmission rod; 171. Bevel gear ring; 18. Circular groove; 181. Electromagnet; 182. Square groove; 183. Push spring; 184. Connecting block; 185. Spiral groove; 186. Circular groove; 2. Worktable; 21. Support rod; 22. Limiting plate; 221. Slide groove; 222. Push plate; 223. Fixed spring; 23. Bevel gear shaft; 24. Strip groove; 25. Screw; 26. Handwheel; 27. Grinding plate. Detailed Implementation

[0037] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0038] like Figures 1 to 9 As shown, the present invention includes the following embodiments:

[0039] Example 1: An injection molding process for producing biodegradable plastic tableware, comprising the following steps:

[0040] S1: The user selects 30-50 parts of polylactic acid, 5-8 parts of bamboo fiber, 2-3 parts of compatibilizer and 1-2 parts of heat stabilizer and puts them into a mixer to stir, and then adds the biodegradable mixture to an injection molding machine to melt and inject it into the molding die 11, which is closed by the fixed mold 111 and the moving mold 112.

[0041] S2: Control the cooling system to cool the molding mold 11, so that the product inside the molding mold 11 cools and solidifies, thereby obtaining a circular array of biodegradable plastic spoons; then control the hydraulic push rod 113 to pull the moving mold 112 and the fixed mold 111 apart;

[0042] S3: At this time, the external robotic arm is controlled to extend between the moving mold 112 and the fixed mold 111, and the circular array of biodegradable plastic spoons is taken out and transported to the workbench 2, so that the circular array of biodegradable plastic spoons is fitted on the support rod 21 of the workbench 2, and the biodegradable plastic spoons are stacked between two adjacent limiting plates 22.

[0043] S4: When the biodegradable plastic spoons in the circular array are stacked to a certain number, the control drive module drives the workbench 2 to the cutting plate 14 to cut off the part of the spoon handle connected by injection molding. At this time, the user can directly take out the spoons stacked between the two adjacent limit plates 22 and pack them into boxes.

[0044] The injection molding machines used in S1-S4 include:

[0045] The machine body 1, the molding die 11 mounted on the upper end of the machine body 1, and the injection molding machine 12 located on one side of the molding die 11; the molding die 11 includes a fixed die 111 and a moving die 112; the fixed die 111 is fixedly connected to the upper end of the machine body 1; the moving die 112 is fixedly connected to the machine body 1 through a hydraulic push rod 113; the injection molding machine 12 is connected to the fixed die 111;

[0046] The worktable 2 has an annular groove 13 at the upper end of the machine body 1. The annular groove 13 is located at the end of the machine body 1 away from the injection molding machine 12. The worktable 2 is slidably installed in the annular groove 13. A support rod 21 and a limiting plate 22 are fixedly installed at the upper end of the worktable 2. A cutting plate 14 is provided at the upper end of the worktable 2. The end of the cutting plate 14 away from the worktable 2 is fixedly connected to the machine body 1 through an electric push rod 141.

[0047] A drive module is installed at the lower end of the machine body 1; the drive module is used to drive the worktable 2 to slide within the annular groove 13.

[0048] In this embodiment, the drive module includes a drive belt 131; the workbench 2 is rotatably mounted on the upper end of the drive belt 131; the drive belt 131 is slidably connected in the annular groove 13; the inner wall of the drive belt 131 is provided with toothed grooves 132; a transmission gear 15 is rotatably mounted on the lower end of the machine body 1; the transmission gear 15 meshes with the drive belt 131; a drive motor 16 is fixedly mounted on the lower end of the machine body 1; the output end of the drive motor 16 is connected to the transmission gear 15 through a transmission unit; the drive motor 16 drives the transmission gear 15 to rotate through the transmission unit.

[0049] In this embodiment, the transmission unit includes a transmission rod 17; the output end of the drive motor 16 has a groove 161; the transmission rod 17 is slidably connected in the groove 161; the lower end of the transmission gear 15 has a circular groove 18; the end of the transmission rod 17 away from the drive motor 16 is connected to the circular groove 18 through a connecting unit; a bevel gear ring 171 is fixedly connected to the surface of the transmission rod 17; a bevel gear shaft 23 is rotatably mounted on the lower end of the drive belt 131; the bevel gear shaft 23 is fixedly connected to the worktable 2; the bevel gear ring 171 meshes with the bevel gear shaft 23.

[0050] In this embodiment, the connecting unit includes an electromagnet 181; a square groove 182 is formed at the bottom of the circular groove 18; the electromagnet 181 is embedded in the bottom of the square groove 182; a push spring 183 is provided between the transmission rod 17 and the bottom of the square groove 182; one end of the push spring 183 is rotatably connected to the transmission rod 17; the other end is fixedly connected to the bottom of the square groove 182.

[0051] Existing spoon injection molds contain multiple cavities arranged in a circular array, each capable of molding a spoon. This circular array of plastic spoons effectively utilizes the space of the injection mold, improving the manufacturing efficiency of the finished spoons. Furthermore, the handles of the multiple spoons in the circular array are interconnected, making it convenient for a robotic arm to remove all the spoons from the mold after injection molding. However, the removed spoons still need to be manually disassembled by workers before they can be packed and transported. Manually disassembling the biodegradable plastic spoons in the circular array not only increases the workload of workers and reduces the speed of packing the spoons, but also increases the risk of workers using excessive force when disassembling the spoons, causing them to break or crack.

[0052] During operation, the fixed mold 111 and the moving mold 112 have cavities on their adjacent sides, and the injection molding machine 12 is connected to the cavity of the fixed mold 111. The user first controls the extension of the hydraulic push rod 113, causing it to push the connected moving mold 112 towards the fixed mold 111 until the moving mold 112 contacts the fixed mold 111, thus closing the cavity between them. At this point, the fixed mold 111 and the moving mold 112 are connected and assembled into the molding die 11. Then, the injection molding machine 12 is controlled... The injection molding machine is preheated. The mixed biodegradable mixture is poured into the preheated injection molding machine, allowing the machine to quickly melt the mixture and inject it into the molding mold 11. When the molten biodegradable mixture fills the molding mold 11, the external cooling system is controlled to deliver cooling water to the cooling chambers of the fixed mold 111 and the moving mold 112, cooling the molding mold 11 composed of the fixed mold 111 and the moving mold 112. This allows the product inside the mold cavity of the molding mold 11 to cool and solidify. At this time, the hydraulic pusher is controlled... The rod 113 resets, allowing the hydraulic push rod 113 to pull the movable mold 112 connected to it to move away from the fixed mold 111, causing the movable mold 112 to separate from the fixed mold 111. At this time, the molded product remains inside the fixed mold 111 connected to the injection molding machine 12. The operation of an external robotic arm is controlled, allowing the robotic arm to extend between the fixed mold 111 and the movable mold 112, enabling the robotic arm to grip and remove the circular array of biodegradable plastic spoons located inside the fixed mold 111. The robotic arm also grips the circular array of biodegradable plastic spoons... The biodegradable plastic spoons are transported from above the machine body 1 to the worktable 2 directly above the moving mold 112, so that the robot arm puts the circular array of biodegradable plastic spoons onto the support rod 21, so that each biodegradable plastic is stuck between two adjacent limit plates 22 until the spoons are stacked to the required number. Then, the electromagnet 181 is energized. Since the electromagnet 181 is in the de-energized state in the initial state, the transmission rod 17 extends out of the square groove 182 and is located in the circular groove 18 under the push of the restoring force of the push spring 183.Since the electromagnet 181 is embedded in the bottom of the square slot 182, when the electromagnet 181 is energized, it generates a magnetic attraction force on the transmission rod 17. This causes the transmission rod 17 to compress and push the spring 183 towards the square slot 182 under the magnetic attraction of the electromagnet 181. If the transmission rod 17 and the square slot 182 are aligned, the transmission rod 17 can compress and push the spring 183 into the square slot 182. If the transmission rod 17 and the square slot 182 are not aligned, the transmission rod 17 is located at the opening of the square slot 182. At this time, the drive motor 16 is controlled to rotate, causing the output end of the drive motor 16 to push the transmission rod 17 to rotate through the groove wall of the groove 161, thus positioning the transmission rod 17 in the square slot 182. One end of the slot can rotate within the circular slot 18 until the transmission rod 17 rotates to engage with the square slot 182. Under the magnetic attraction of the electromagnet 181, the transmission rod 17 squeezes and pushes the spring 183 into the square slot 182. At this time, the drive motor 16 continues to rotate, causing the drive motor 16 to drive the wall of the square slot 182 through the transmission rod 17, thereby driving the transmission gear 15 to rotate. Since the inner ring wall of the drive belt 131 has a toothed groove 132, and the transmission gear 15 meshes with the toothed groove 132 of the drive belt 131, the rotating transmission gear 15 can drive the drive belt 131 to move within the annular slot 13. And because the worktable 2 is rotatably connected to the upper end of the drive belt 131, the drive belt 131 can drive the worktable 2 within the annular slot 13. Synchronous movement causes the drive belt 131 to move the worktable 2, which is fitted with a circular array of biodegradable plastic spoons, away from the moving mold 112. Since there are two worktables 2, the worktable 2 without the circular array of biodegradable plastic spoons moves closer to the moving mold 112 until the drive belt 131 moves the worktable 2 with the circular array of biodegradable plastic spoons to the end of the annular groove 13 away from the moving mold 112. At this point, the worktable 2 with the circular array of biodegradable plastic spoons is directly below the cutting plate 14. The electric push rod 141 is then controlled to move, allowing it to push the cutting plate 14 down and contact the end of the handle of the circular array of biodegradable plastic spoons. This causes the cutting plate 14 to lower the circular array of biodegradable plastic spoons. The connection at the base of the handle of the biodegradable plastic spoon is cut off. After the connection at the base of the handle of the stacked circular array of biodegradable plastic spoons is cut off, the electric push rod 141 is controlled to drive the cutting plate 14 to reset. At this time, the handle of the biodegradable spoon is clamped between two adjacent limiting plates 22. When the user needs to pack the spoons, he / she only needs to pull out the spoons clamped between the two adjacent limiting plates 22 for packing. When it is necessary to remove the spoons clamped by the limiting plate 22 on the side of the worktable 2 near the moving mold 112, the user only needs to control the electromagnet 181 to de-energize, so that the transmission rod 17 extends out of the square groove 182 and enters the circular groove 18 under the push of the restoring force of the push spring 183, while the end of the transmission rod 17 located in the groove 161 slides into the groove 161.Since the bevel gear ring 171 is fixedly connected to the surface of the transmission rod 17, as the transmission rod 17 extends downward out of the square groove 182, the transmission rod 17 will drive the bevel gear ring 171 to move downward synchronously. As the bevel gear ring 171 moves downward, it will continuously approach the bevel gear shaft 23 below until the bevel gear shaft 23 contacts and meshes with the bevel gear ring 171. Since the bevel gear shaft 23 is fixedly connected to the worktable 2, the user can control the drive motor 16 to rotate, so that the drive motor 16 can drive the transmission rod 17 to drive the bevel gear shaft 23 to rotate through the bevel gear ring 171. This allows the bevel gear shaft 23 to drive the worktable 2 fixedly connected to it to rotate synchronously. During the rotation of the worktable 2, the biodegradable plastic spoon above it and close to the moving mold 112 can rotate synchronously, allowing the biodegradable plastic spoon on the worktable 2 to rotate to the end of the machine body 1 away from the injection molding machine 12, thus making it convenient for the user to remove the biodegradable plastic spoon between the limiting plates 22.

[0053] This invention, through the design of a cutting plate 14, enables the cutting plate 14 to cut off the joint at the base of the handle of the circular array of biodegradable plastic spoons. This eliminates the need for manual disassembly of the circular array of biodegradable plastic spoons, allowing workers to directly pack and store the spoons after cutting. This not only reduces the labor intensity of workers and improves packing efficiency but also prevents excessive force from being applied when disassembling the spoons, thus preventing breakage or damage and improving the product quality of the biodegradable spoons. This effectively enhances the practicality of the invention.

[0054] In this embodiment, a strip groove 24 is provided on the upper end of the workbench 2; the support rod 21 is slidably connected in the strip groove 24; a screw 25 is rotatably connected in the strip groove 24; the threads at both ends of the screw 25 are in opposite directions; the support rod 21 is helically connected to both ends of the screw 25; a handwheel 26 fixedly connected to the screw 25 is rotatably connected to the side wall of the workbench 2;

[0055] During operation, the number of biodegradable plastic spoons injected into the circular array varies depending on the mold size. When the number of biodegradable plastic spoons in the circular array is small, the diameter of the circle formed at the spoon handle connection is small; similarly, when the number of biodegradable plastic spoons in the circular array is large, the diameter of the circle formed at the spoon handle connection is large. Therefore, before the user injects the spoons, they adjust the support rod 21 according to the size of the circle formed at the spoon handle connection. When the diameter of the circle formed at the spoon handle connection is large, the user rotates the handwheel 26 to... The handwheel 26 can drive the screw 25 connected to it to rotate synchronously. Since the threads at both ends of the screw 25 are set in opposite directions, the screw 25 can drive the two support rods 21 connected to it to move away from each other along the strip groove 24. This increases the distance between the two support rods 21, thereby facilitating the effective support of the support rods 21 for the connection of the spoon handle. This avoids the spoon handle from shaking during the cutting process, which could lead to misalignment at the cutting point, thus ensuring the cutting accuracy at the base of the spoon handle. This effectively improves the practical application effect of the invention.

[0056] In this embodiment, a groove 221 extending through to the upper surface of the two adjacent limiting plates 22 is provided on the side that is close to each other; a grinding plate 27 is slidably connected in the groove 221.

[0057] In this embodiment, a push plate 222 is slidably connected inside the slide groove 221; the push plate 222 and the bottom of the slide groove 221 are fixedly connected by a fixing spring 223.

[0058] During the injection molding process of the spoon, due to the fluidity of the biodegradable plastic material and the design of the mold, burrs may appear on the edge or joint of the spoon handle after cooling and solidification. Therefore, a polishing plate 27 is provided. When the user pulls the spoon out between the limiting plates 22, the polishing plates 27 clamping on both sides of the spoon handle will slide into contact with the spoon, allowing the polishing plates 27 to polish the edge of the spoon handle. Since the shape design of spoons from different brands is different, the width of the spoon handle is different. Therefore, the push plate 222 is provided so that, on the one hand, the push plate 222, under the restoring force of the fixed spring 223, can push the polishing plate 27 in contact with it to extend away from the slide groove 221, so that the polishing plate 27 can clamp the stacked spoons, allowing the cutting plate to cut and separate the connected spoons, while the spoons are still stably clamped between the two adjacent limiting plates 22 by the polishing plate 27; on the other hand, As the handle of the spoon widens away from the spoon body, it pushes the polishing plates 27 on both sides, causing the push plate 222 to move closer to the bottom of the groove 221. This allows the push plate 222 to compress the fixing spring 223 and enter the groove near the bottom of the groove 221. This not only prevents the spoon from getting stuck between the two limiting plates 22, but also increases the pressure friction between the polishing plate 27, which is pushed by the restoring force of the fixing spring 223, and the spoon, further improving the polishing effect of the polishing plate 27 on both sides of the spoon handle. Moreover, by setting the groove 221 to extend through the upper surface of the limiting plate 22, the user can insert the polishing plate 27 into the groove 221 from the upper end of the limiting plate 22. Therefore, when the user needs to change the polishing precision and effect of the burrs on both sides of the spoon handle, they only need to replace the polishing plate 27 with one of different roughness to change the polishing precision and effect on the spoon handle. This effectively improves the practical application effect of the invention.

[0059] Example 2, the difference between this example and Example 1 is:

[0060] The connecting unit includes a connecting block 184; the connecting block 184 is fixedly connected to the transmission rod 17; the inner wall of the circular groove 18 is provided with a spiral groove 185 and a circular groove 186; the spiral groove 185 and the circular groove 186 are connected; the transmission rod 17 is slidably connected to the spiral groove 185 through the connecting block 184.

[0061] In operation, initially, the transmission rod 17 is located within the spiral groove 185. When the user needs to control the drive motor 16 to drive the drive belt 131 to move within the annular groove 13, the user only needs to control the drive motor 16 to rotate, so that the drive motor 16 can drive the transmission rod 17 to rotate within the circular groove 18, causing the transmission rod 17 to drive the connecting block 184 fixed to it to slide within the spiral groove 185 until the transmission rod 17 drives the connecting block 184 to slide to the uppermost end of the spiral groove 185. At this time, the transmission rod 17 contacts the bottom of the circular groove 18, and the transmission rod 17 pushes the bottom of the spiral groove 185 through the connecting block 184, thereby driving the transmission gear 15 to rotate; causing the transmission gear 15 to drive the drive belt 131 to move within the annular groove 13. When it is necessary to control the rotation of the worktable 2, the user controls the transmission rod 17 to rotate within the annular groove 13. The drive motor 16 is controlled to rotate in the reverse direction, causing the connecting block 184 to rotate in the reverse direction within the circular groove 18. This causes the connecting block 184 to slide downwards along the spiral groove 185, which in turn causes the transmission rod 17 to extend downwards out of the circular groove 18. At this time, the transmission rod 17 drives the bevel gear ring 171 on its surface to move closer to the bevel gear shaft 23 until the connecting block 184 rotates through the spiral groove 185 and enters the circular groove 186. At this point, the bevel gear ring 171 contacts and meshes with the bevel gear shaft 23. The drive motor 16 is then controlled to rotate, enabling it to drive the transmission rod 17 to rotate the connecting block 184 within the circular groove 186. The bevel gear ring 171 on the surface of the transmission rod 17, driven by the transmission rod 17, drives the bevel gear shaft 23 to rotate the worktable 2.

[0062] This invention, through the cooperation of the spiral groove 185 and the circular groove 186, enables the forward-rotating drive motor 16 to drive the transmission rod 17 to drive the connecting block 184 into the spiral groove 185. This improves the rotation of the transmission gear 15 driven by the bottom of the spiral groove 185. Meanwhile, the reverse-rotating drive motor 16 drives the connecting block 184 on the surface of the transmission rod 17 into the circular groove 186, thereby driving the bevel gear shaft 23 to rotate the worktable 2. This eliminates the need for the electromagnet 181, reducing the energy consumption of this invention. It not only reduces energy waste but also lowers the cost of electricity, further enhancing the practical application effect of this invention.

[0063] The specific workflow is as follows:

[0064] Example 1: During operation, the fixed mold 111 and the moving mold 112 have cavities on their adjacent sides, and the injection molding machine 12 is connected to the cavity of the fixed mold 111. The user first controls the extension of the hydraulic push rod 113, causing the hydraulic push rod 113 to push the moving mold 112 connected to it towards the fixed mold 111 until the moving mold 112 contacts the fixed mold 111, so that the cavity between the fixed mold 111 and the moving mold 112 is in a closed state. At this time, the fixed mold 111 and the moving mold 112 are connected and combined to form the molding die 11. The injection molding machine is then preheated. The biodegradable mixture is poured into the preheated machine, causing it to rapidly melt and inject the mixture into the molding mold 11. When the mold 11 is full of melted biodegradable mixture, the external cooling system delivers cooling water to the cooling chambers of the fixed mold 111 and the moving mold 112, cooling the molding mold 11. This allows the product inside the mold cavity to cool and solidify. At this point, the system is controlled... The hydraulic push rod 113 resets, allowing it to pull the movable mold 112 connected to it to move away from the fixed mold 111, thus separating the movable mold 112 from the fixed mold 111. At this point, the molded product remains inside the fixed mold 111 connected to the injection molding machine 12. The external robotic arm is then controlled to extend between the fixed mold 111 and the movable mold 112, gripping and removing the circular array of biodegradable plastic spoons located within the fixed mold 111. The biodegradable plastic spoons are transported from above the machine body 1 to the workbench 2 directly above the moving mold 112, so that the robot arm puts the circular array of biodegradable plastic spoons onto the support rod 21, so that each biodegradable plastic is stuck between two adjacent limit plates 22 until the spoons are stacked to the required number. Then, the electromagnet 181 is energized. Since the electromagnet 181 is in the de-energized state in the initial state, the transmission rod 17 extends out of the square groove 182 and is located in the circular groove 18 under the push of the restoring force of the push spring 183.Since the electromagnet 181 is embedded in the bottom of the square slot 182, when the electromagnet 181 is energized, it generates a magnetic attraction force on the transmission rod 17. This causes the transmission rod 17 to compress and push the spring 183 towards the square slot 182 under the magnetic attraction of the electromagnet 181. If the transmission rod 17 and the square slot 182 are aligned, the transmission rod 17 can compress and push the spring 183 into the square slot 182. If the transmission rod 17 and the square slot 182 are not aligned, the transmission rod 17 is located at the opening of the square slot 182. At this time, the drive motor 16 is controlled to rotate, causing the output end of the drive motor 16 to push the transmission rod 17 to rotate through the groove wall of the groove 161, thus positioning the transmission rod 17 in the square slot 182. One end of the slot can rotate within the circular slot 18 until the transmission rod 17 rotates to engage with the square slot 182. Under the magnetic attraction of the electromagnet 181, the transmission rod 17 squeezes and pushes the spring 183 into the square slot 182. At this time, the drive motor 16 continues to rotate, causing the drive motor 16 to drive the wall of the square slot 182 through the transmission rod 17, thereby driving the transmission gear 15 to rotate. Since the inner ring wall of the drive belt 131 has a toothed groove 132, and the transmission gear 15 meshes with the toothed groove 132 of the drive belt 131, the rotating transmission gear 15 can drive the drive belt 131 to move within the annular slot 13. And because the worktable 2 is rotatably connected to the upper end of the drive belt 131, the drive belt 131 can drive the worktable 2 within the annular slot 13. Synchronous movement causes the drive belt 131 to move the worktable 2, which is fitted with a circular array of biodegradable plastic spoons, away from the moving mold 112. Since there are two worktables 2, the worktable 2 without the circular array of biodegradable plastic spoons moves closer to the moving mold 112 until the drive belt 131 moves the worktable 2 with the circular array of biodegradable plastic spoons to the end of the annular groove 13 away from the moving mold 112. At this point, the worktable 2 with the circular array of biodegradable plastic spoons is directly below the cutting plate 14. The electric push rod 141 is then controlled to move, allowing it to push the cutting plate 14 down and contact the end of the handle of the circular array of biodegradable plastic spoons. This causes the cutting plate 14 to lower the circular array of biodegradable plastic spoons. The connection at the base of the handle of the biodegradable plastic spoon is cut off. After the connection at the base of the handle of the stacked circular array of biodegradable plastic spoons is cut off, the electric push rod 141 is controlled to drive the cutting plate 14 to reset. At this time, the handle of the biodegradable spoon is clamped between two adjacent limiting plates 22. When the user needs to pack the spoons, he / she only needs to pull out the spoons clamped between the two adjacent limiting plates 22 for packing. When it is necessary to remove the spoons clamped by the limiting plate 22 on the side of the worktable 2 near the moving mold 112, the user only needs to control the electromagnet 181 to de-energize, so that the transmission rod 17 extends out of the square groove 182 and enters the circular groove 18 under the push of the restoring force of the push spring 183, while the end of the transmission rod 17 located in the groove 161 slides into the groove 161.Since the bevel gear ring 171 is fixedly connected to the surface of the transmission rod 17, as the transmission rod 17 extends downward out of the square groove 182, the transmission rod 17 will drive the bevel gear ring 171 to move downward synchronously. As the bevel gear ring 171 moves downward, it will continuously approach the bevel gear shaft 23 below until the bevel gear shaft 23 contacts and meshes with the bevel gear ring 171. Since the bevel gear shaft 23 is fixedly connected to the worktable 2, the user can control the drive motor 16 to rotate, so that the drive motor 16 can drive the transmission rod 17 to drive the bevel gear shaft 23 to rotate through the bevel gear ring 171. This allows the bevel gear shaft 23 to drive the worktable 2 fixedly connected to it to rotate synchronously. During the rotation of the worktable 2, the biodegradable plastic spoon above it and close to the moving mold 112 can rotate synchronously, allowing the biodegradable plastic spoon on the worktable 2 to rotate to the end of the machine body 1 away from the injection molding machine 12, thus making it convenient for the user to remove the biodegradable plastic spoon between the limiting plates 22.

[0065] The number of biodegradable plastic spoons in the circular array injected by molds of different sizes varies. When the number of biodegradable plastic spoons in the circular array is small, the diameter of the circle formed at the spoon handle connection is small; similarly, when the number of biodegradable plastic spoons in the circular array is large, the diameter of the circle formed at the spoon handle connection is large. Therefore, before the user injects the spoons, they adjust the support rod 21 according to the size of the circle formed at the spoon handle connection. When the diameter of the circle formed at the spoon handle connection is large, the user can adjust it by turning the handwheel 26. The handwheel 26 can drive the screw 25 connected to it to rotate synchronously. Because the threads at both ends of the screw 25 are set in opposite directions, the screw 25 can drive the two support rods 21 connected to it to move away from each other along the strip groove 24. This increases the distance between the two support rods 21, thereby facilitating the effective support of the support rods 21 for the connection of the spoon handle. This avoids the spoon handle from shaking during the cutting process, which could lead to misalignment at the cutting point, thus ensuring the cutting accuracy at the base of the spoon handle. This effectively improves the practical application effect of the invention.

[0066] The difference between Example 2 and Example 1 is as follows: In the initial state, the transmission rod 17 is located within the spiral groove 185; when the user needs to control the drive motor 16 to drive the drive belt 131 to move within the annular groove 13, the user only needs to control the drive motor 16 to rotate, so that the drive motor 16 can drive the transmission rod 17 to rotate within the circular groove 18, causing the transmission rod 17 to drive the connecting block 184 fixed to it to slide within the spiral groove 185 until the transmission rod 17 drives the connecting block 184 to slide to the uppermost end of the spiral groove 185. At this time, the transmission rod 17 contacts the bottom of the circular groove 18, and the transmission rod 17 pushes the bottom of the spiral groove 185 through the connecting block 184, thereby driving the transmission gear 15 to rotate; causing the transmission gear 15 to drive the drive belt 131 to move within the annular groove 13; when it is necessary to control the rotation of the worktable 2... The user controls the drive motor 16 to rotate in the opposite direction, causing the drive motor 16 to drive the connecting block 184 to rotate in the opposite direction within the circular groove 18. This causes the connecting block 184 to slide downwards along the spiral groove 185, which in turn causes the connecting block 184 to drive the transmission rod 17 to extend downwards out of the circular groove 18. At this time, the transmission rod 17 drives the bevel gear ring 171 on its surface to move closer to the bevel gear shaft 23 until the connecting block 184 rotates through the spiral groove 185 and enters the circular groove 186. At this point, the bevel gear ring 171 contacts and meshes with the bevel gear shaft 23. The user then continues to control the drive motor 16 to rotate, so that the drive motor 16 can drive the transmission rod 17 to drive the connecting block 184 to rotate within the circular groove 186. Under the drive of the transmission rod 17, the bevel gear ring 171 on the surface of the transmission rod 17 can drive the bevel gear shaft 23 to rotate the worktable 2.

[0067] In the description of this invention, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the appendix. Figure 1 The orientations or positional relationships shown are for the convenience of describing the present invention and simplifying the description only, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the scope of protection of the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description and should not be construed as indicating or implying relative importance.

[0068] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. An injection molding process for producing biodegradable plastic tableware, characterized in that: Includes the following steps: S1: The user selects 30-50 parts of polylactic acid, 5-8 parts of bamboo fiber, 2-3 parts of compatibilizer and 1-2 parts of heat stabilizer and puts them into a stirrer to stir and obtain a biodegradable mixture. The biodegradable mixture is added to an injection molding machine to melt and is injected into the molding die (11) where the fixed mold (111) and the moving mold (112) are closed. S2: Control the cooling system to cool the molding die (11), so that the product inside the molding die (11) cools and solidifies, thereby obtaining a circular array of biodegradable plastic spoons; then control the hydraulic push rod (113) to pull the moving die (112) and the fixed die (111) to separate; S3: At this time, the external robotic arm is controlled to extend between the moving mold (112) and the fixed mold (111) to take out the circular array of biodegradable plastic spoons and transport them to the workbench (2), so that the circular array of biodegradable plastic spoons is fitted on the support rod (21) of the workbench (2), and the biodegradable plastic spoons are stacked between two adjacent limiting plates (22). S4: When the biodegradable plastic spoons in the circular array are stacked to a certain number, the control drive module drives the worktable (2) to the cutting plate (14) to cut off the part of the spoon handle connected by injection molding. At this time, the user can directly take out the spoons stacked between the two adjacent limiting plates (22) and pack them into boxes. The injection molding machines used in S1-S4 include: The machine body (1) and the molding die (11) mounted on the upper end of the machine body (1) and the injection molding machine (12) located on one side of the molding die (11); the molding die (11) includes a fixed die (111) and a moving die (112); the fixed die (111) is fixedly connected to the upper end of the machine body (1); the moving die (112) is connected to the machine body (1) through a hydraulic push rod (113); the injection molding machine (12) is connected to the fixed die (111); The worktable (2) has an annular groove (13) at the upper end of the machine body (1); the annular groove (13) is located at the end of the machine body (1) away from the injection molding machine (12); the worktable (2) is slidably installed in the annular groove (13); a support rod (21) and a limiting plate (22) are fixedly installed at the upper end of the worktable (2); a cutting plate (14) is provided at the upper end of the worktable (2); the end of the cutting plate (14) away from the worktable (2) is fixedly connected to the machine body (1) through an electric push rod (141); A drive module is installed at the lower end of the machine body (1); the drive module is used to drive the worktable (2) to slide in the annular groove (13); The drive module includes a drive belt (131); the worktable (2) is rotatably mounted on the upper end of the drive belt (131); the drive belt (131) is slidably connected in an annular groove (13); the inner wall of the drive belt (131) is provided with toothed grooves (132); a transmission gear (15) is rotatably mounted on the lower end of the machine body (1); the transmission gear (15) meshes with the drive belt (131); a drive motor (16) is fixedly mounted on the lower end of the machine body (1); the output end of the drive motor (16) is connected to the transmission gear (15) through a transmission unit; the drive motor (16) drives the transmission gear (15) to rotate through the transmission unit; The transmission unit includes a transmission rod (17); the output end of the drive motor (16) has a groove (161); the transmission rod (17) is slidably connected in the groove (161); the lower end of the transmission gear (15) has a circular groove (18); the end of the transmission rod (17) away from the drive motor (16) is connected in the circular groove (18) through a connecting unit; a bevel gear ring (171) is fixedly connected to the surface of the transmission rod (17); a bevel gear shaft (23) is rotatably mounted on the lower end of the drive belt (131); the bevel gear shaft (23) is fixedly connected to the worktable (2); the bevel gear ring (171) meshes with the bevel gear shaft (23); The connecting unit includes an electromagnet (181); a square groove (182) is provided at the bottom of the circular groove (18); the electromagnet (181) is embedded in the bottom of the square groove (182); a push spring (183) is provided between the transmission rod (17) and the bottom of the square groove (182); one end of the push spring (183) is rotatably connected to the transmission rod (17); the other end is fixedly connected to the bottom of the square groove (182); or the connecting unit includes a connecting block (184); the connecting block (184) is fixedly connected to the transmission rod (17); a spiral groove (185) and a circular groove (186) are provided on the inner wall of the circular groove (18); the spiral groove (185) and the circular groove (186) are connected; the transmission rod (17) is slidably connected in the spiral groove (185) through the connecting block (184).

2. The injection molding process for producing biodegradable plastic tableware according to claim 1, characterized in that: The upper end of the workbench (2) is provided with a strip groove (24); the support rod (21) is slidably connected in the strip groove (24); a screw (25) is rotatably connected in the strip groove (24); the threads at both ends of the screw (25) are opposite in direction; the support rod (21) is helically connected to both ends of the screw (25); a handwheel (26) fixed to the screw (25) is rotatably connected to the side wall of the workbench (2).

3. The injection molding process for producing biodegradable plastic tableware according to claim 2, characterized in that: The two adjacent limiting plates (22) have a sliding groove (221) that extends through to the upper surface of the limiting plate (22) on their side that is close to each other; a grinding plate (27) is slidably connected in the sliding groove (221).

4. The injection molding process for producing biodegradable plastic tableware according to claim 3, characterized in that: A push plate (222) is slidably connected inside the groove (221); the push plate (222) is fixedly connected to the bottom of the groove (221) by a fixing spring (223).

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