Injection molding machine for mower grass collecting box production

Abstract

This invention discloses an injection molding machine for producing grass collection boxes for lawnmowers, relating to the technical field of plastic waste recycling. The machine includes a frame with a mold box mounted on it. A heating cylinder is located on the side of the mold box, and a feed hopper is connected to the upper end of the heating cylinder. A nozzle at the end of the heating cylinder is connected to the side of the mold box. A limiting mold is located on the side of the mold box, and a main runner is opened inside the limiting mold. A mold assembly is located inside the mold box, and a snap-fit ​​assembly is installed inside the fixed mold. Because the injection nozzle volume is much smaller than the main runner volume, excess material falls under gravity after separation, eliminating the need for post-processing and reducing manual labor intensity. The moving top plate pushes the grass collection box off the module, avoiding scratches or damage to the molded part surface caused by manual demolding, ensuring product appearance quality, and automating the demolding process.

Description

Technical Field

[0001] This invention relates to the technical field of plastic waste recycling, specifically to an injection molding machine for producing grass collection boxes for lawnmowers. Background Technology

[0002] Injection molding machines are key tools for producing plastic products. Plastic raw materials are heated and melted before being injected into the mold cavity. After cooling and solidification, they form products of a predetermined shape. Currently, injection molding technology is being used more and more widely, and the recycling and reuse of plastic waste has become an important measure to reduce costs, increase efficiency, and reduce environmental impact.

[0003] Existing technology 1 (Chinese patent CN218429626U, published on February 3, 2023) discloses a convenient and efficient injection molding machine, comprising a base plate. A mounting bracket is provided on one side of the top surface of the base plate, and a material conveying box is mounted on the mounting bracket. A motor is mounted on the top surface of the material conveying box, and the output end of the motor is fixedly connected to a rotating rod through the material conveying box. A spiral blade is mounted on the rotating rod. Material is directly poured into the collection hopper on the material conveying box. The motor drives the rotating rod to rotate, causing the spiral blade on the rotating rod to rotate, thus conveying the injection molding material to the feeding hopper on the injection molding machine body. This facilitates automatic material feeding, reduces the labor intensity of workers, and improves work efficiency. The use of a baffle plate on the top surface of the feeding hopper effectively blocks the injection molding material, preventing material from splashing out of the feeding hopper, reducing drawbacks during use, and improving its efficiency. The prior art (Chinese patent CN219727106U, published on September 22, 2023) describes a heating device for an injection molding machine, comprising a base, a barrel, a threaded rod, and a feeding hopper. The barrel, internally connected to the threaded rod, is fixedly connected to the upper surface of the base. The feeding hopper is fixedly connected to the upper front end of the barrel, and a heating coil is installed inside the feeding hopper. A top cover is provided on the top of the feeding hopper, and a screw is provided directly behind the feeding hopper. The top cover is movably connected to the feeding hopper via the screw, and a stirring shaft is movably connected to the bottom of the top cover. By setting up the feeding hopper, plastic granules can be heated, thereby saving energy and providing precise heating of the plastic granules. By setting up the stirring shaft, the plastic granules can be stirred, thereby making the plastic granules heated more evenly. By setting up the heat insulation pad, the damage caused by heat to the workers and the third motor can be reduced, and the heat insulation pad is easy to disassemble and replace. By setting up the threaded rod, the top cover can be raised and lowered.

[0004] While existing injection molding machines can achieve one-piece molding of products, the separation of the mold after product molding relies on manual assistance. This not only makes it difficult to match the pace of automated production, but also increases the probability of quality defects due to manual contact with the finished product. Furthermore, the waste material at the pouring nozzle is molded simultaneously with the product, requiring additional manpower and equipment for waste disposal, which reduces the operating efficiency of the production line.

[0005] To address the aforementioned issues, there is an urgent need for innovative design based on the existing injection molding machine used for producing lawnmower grass collection boxes. Therefore, we proposed that the injection molding machine for producing lawnmower grass collection boxes can effectively solve the above problems. Summary of the Invention

[0006] The purpose of this invention is to provide an injection molding machine for producing grass collection boxes for lawnmowers, in order to solve the problem mentioned in the background art that although the injection molding machines on the market can achieve one-piece molding of products, the separation of the mold after product molding relies on manual assistance. This is not only difficult to match with the pace of automated production, but also increases the probability of quality defects due to manual contact with the finished product. Furthermore, the waste material at the pouring nozzle is molded simultaneously with the product, requiring additional manpower and equipment for waste disposal, which reduces the operating efficiency of the production line.

[0007] To achieve the above objectives, the present invention provides the following technical solution: an injection molding machine for producing grass collection boxes for lawnmowers, comprising a frame, a mold box mounted on the frame, a heating cylinder mounted on the side of the mold box, a screw mounted inside the heating cylinder, a feed hopper connected to the upper end of the heating cylinder, a nozzle connected to the end of the heating cylinder and on the side of the mold box, a limiting mold mounted on the side of the mold box, a main runner opened inside the limiting mold, one side of the main runner communicating with the nozzle at the end of the heating cylinder, a mold assembly mounted inside the mold box, the mold assembly including a moving mold mounted inside the mold box, a top plate mounted on the side of the moving mold, a fixed mold mounted on the side of the top plate, an injection nozzle and a mold cavity opened inside the fixed mold, the injection nozzle communicating with the mold cavity, the injection nozzle located on the other side of the main runner, the volume of the injection nozzle being much smaller than the volume of the main runner, and a snap-fit ​​assembly mounted inside the fixed mold.

[0008] Preferably, a module adapted to the mold cavity is installed on one side of the moving mold. Guide blocks are provided on the moving mold, the top plate, and the fixed mold. Guide rods penetrating the guide blocks are provided on both the upper and lower sides of the mold box. A snap-fit ​​rod is provided on the side end of the moving mold. An annular groove is opened on the outer side of the snap-fit ​​rod. The snap-fit ​​assembly includes a component groove installed inside the fixed mold. A snap-fit ​​block adapted to the annular groove is connected inside the component groove by a spring.

[0009] Preferably, the top plate and the fixed mold are provided with rod grooves that are adapted to the snap-fit ​​rods, the side end of the limiting mold is equipped with a limiting block, the bottom side of the limiting block is provided with a sliding groove, the top plate and the fixed mold are provided with through grooves that are adapted to the limiting block, the side end of the moving mold is provided with a limiting groove that is adapted to the limiting block, and a slider is installed inside the fixed mold, the top end of the slider is slidably connected inside the sliding groove.

[0010] Preferably, an air injection hole is provided on the other side of the moving mold, the air injection hole is connected to an external air pump, an air injection groove is provided inside the moving mold, a matching movable plate is installed inside the air injection groove, and the side end of the movable plate is connected to the side wall of the top plate through a connecting rod.

[0011] Preferably, the fixed mold has a placement groove inside, a sleeve is installed inside the placement groove, an ejector rod is movably connected inside the sleeve, an arc block is installed at the top of the ejector rod, an arc groove is opened inside the fixed mold and the arc groove is connected to the injection nozzle, the arc block is located inside the arc groove, an air supply cylinder is sleeved on the outside of the ejector rod, the inner cavity of the sleeve is connected to the inner cavity of the air supply cylinder through a delivery pipe, and a through groove is opened at the top of the air supply cylinder, and an auxiliary component is installed on the side end of the sleeve.

[0012] Preferably, the auxiliary component includes an air supply pipe installed on the side end of the sleeve. The air supply pipe passes through the fixed mold and is connected to an external air pump. The air supply pipe is installed at a position lower than the interface position of the delivery pipe on the side end of the sleeve.

[0013] Preferably, the auxiliary components include a second pipe and a third pipe installed on the side end of the sleeve, each of which is equipped with a one-way valve, and the installation positions of the second pipe and the third pipe are both lower than the interface position of the conveying pipe on the side end of the sleeve.

[0014] Preferably, an air supply assembly is installed inside the fixed mold. The air supply assembly includes a conveying cylinder installed inside the fixed mold. The input end of the conveying cylinder is connected to the external environment through a first pipe, and the output end of the conveying cylinder is connected to the side end of the sleeve through a second pipe. A one-way valve is provided on the first pipe. A piston is connected through the inside of the conveying cylinder. A first magnetic block is installed at the end of the piston, and a second magnetic block that is magnetically attracted to the first magnetic block is provided at the side end of the slider.

[0015] Preferably, the bottom of the mold box is provided with a guide groove, and a storage box is installed inside the frame. The storage box is located on the lower surface of the guide groove, and a guide component is installed inside the storage box.

[0016] Compared with the prior art, the beneficial effects of this invention are as follows: The injection molding machine for producing the grass collection box of this lawnmower, because the injection nozzle volume is much smaller than the main runner volume, allows excess material blocks to fall under gravity after separation, eliminating the need for post-processing and reducing manual labor intensity. The moving top plate pushes the grass collection box off the module, avoiding scratches or damage to the molded part surface caused by manual demolding, ensuring product appearance quality, and automating the demolding process. The specific details are as follows: The spring-driven engagement of the locking rod and locking block ensures the stable fixation of the moving mold, top plate, and fixed mold. At the same time, the precise embedding of the limiting block and limiting groove completes the mold closing positioning, improving the overall stability after mold closing and effectively avoiding the dimensional deviation of the molded parts caused by mold offset during injection molding.

[0017] The equipment uses granules from recycled plastic waste as injection molding raw materials, which not only realizes the resource reuse of plastic waste, but also reduces the pollution of plastic waste to the environment, thus balancing economic and ecological benefits.

[0018] The device uses gravity to automatically separate and drop excess material blocks, which fall into the storage box through the guide channel at the bottom of the mold box. The guide component in the storage box diverts the excess material blocks from the subsequent demolding grass collection box, which facilitates the recycling and reuse of excess material blocks and the sorting and storage of grass collection boxes, making it convenient for later processing.

[0019] The snap-fit ​​structure can automatically separate as the mold moves without manual intervention. The automated demolding design reduces the intensity of manual labor, improves the orderliness of the production process, avoids scratches and damage to the surface of the molded parts caused by manual demolding, and ensures the appearance quality of the product and the service life of the mold.

[0020] The device utilizes the driving force of the slider movement during mold closing and demolding, and controls the piston sliding through magnetic block adsorption and detachment to achieve automatic gas intake and directional delivery. It eliminates the need for an additional air pump drive structure, achieving rational energy utilization and further reducing energy consumption. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the internal structure of the storage box of the present invention; Figure 3 This is a schematic diagram of the internal structure of the heating cylinder of the present invention; Figure 4 This is a schematic diagram of the internal structure of the mold box of the present invention; Figure 5 For the present invention Figure 4 Enlarged structural diagram at point A in the middle; Figure 6 This is a schematic diagram of the cross-sectional structure of the moving mold of the present invention; Figure 7 This is a schematic diagram of the structure of the moving mold, top plate, and fixed mold of the present invention when they move synchronously; Figure 8 This is a schematic diagram of the structure of the snap-fit ​​rod after it is separated from the fixed mold in this invention; Figure 9 This is a schematic diagram of the structure of the movable plate of the present invention when it moves; Figure 10 This is a schematic diagram of the connection structure between the fixed mold and the gas pipeline of the present invention; Figure 11 This is a schematic diagram of the fixed mold section structure of the present invention; Figure 12 This is a schematic diagram of the cross-sectional structure of the sleeve of the present invention; Figure 13 This is a schematic diagram of the cross-sectional structure of the limiting block of the present invention; Figure 14 This is a schematic diagram of the structure after the slider of the present invention has moved; Figure 15 This is a schematic diagram of the cross-sectional structure of the conveyor cylinder of the present invention; Figure 16 This is a schematic diagram of the internal structure of the storage slot of the present invention.

[0022] In the diagram: 1. Frame; 2. Feed hopper; 3. Heating cylinder; 4. Screw; 5. Mold box; 6. Moving mold; 7. Top plate; 8. Fixed mold; 9. Limiting mold; 10. Main runner; 11. Injection nozzle; 12. Mold cavity; 13. Module; 14. Connecting rod; 15. Annular groove; 16. Spring; 17. Connecting block; 18. Limiting block; 19. Sliding groove; 20. Slider; 21. Limiting groove; 22. Connecting rod ; 23. Moving plate; 24. Air injection groove; 25. Air injection hole; 26. Storage groove; 27. Sleeve; 28. Air supply pipe; 29. ​​Top rod; 30. Arc block; 31. Conveying pipe; 32. Air supply cylinder; 33. Conveying cylinder; 34. First pipe; 35. Second pipe; 36. Piston; 37. First magnetic block; 38. Second magnetic block; 39. Third pipe; 40. Storage box; 41. Guide component. Detailed Implementation

[0023] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] Example 1: In this example, gas enters the gas injection groove 24 and pushes the moving plate 23. The moving plate 23 pushes the top plate 7 through the connecting rod 22. The top plate 7 slides on the surface of the module 13, pushing the grass collection box off the module 13. This avoids scratches or damage to the surface of the molded part caused by manual demolding. Figures 1-9The technical solution shown includes a frame 1, on which a mold box 5 is mounted. A heating cylinder 3 is located on the side of the mold box 5, and a screw 4 is installed inside the heating cylinder 3. A feed hopper 2 is connected to the upper end of the heating cylinder 3, and a nozzle at the end of the heating cylinder 3 is connected to the side of the mold box 5. A limiting mold 9 is located on the side of the mold box 5, and a main channel 10 is opened inside the limiting mold 9. One side of the main channel 10 is connected to the nozzle at the end of the heating cylinder 3. A mold assembly is located inside the mold box 5, including a moving mold 6 installed inside the mold box 5. A top plate 7 is located on the side of the moving mold 6, and a fixed mold 8 is located on the side of the top plate 7. An injection nozzle 11 and a mold cavity 12 are opened inside the fixed mold 8 and are connected to the mold cavity 12. The injection nozzle 11 is located on the other side of the main channel 10. The volume of mold 11 is much smaller than that of the main channel 10. A snap-fit ​​assembly is installed inside the fixed mold 8. A module 13 adapted to the mold cavity 12 is installed on one side of the moving mold 6. Guide blocks are provided on the moving mold 6, top plate 7, and fixed mold 8. Guide rods penetrating the guide blocks are provided on both the upper and lower sides of the mold box 5. A snap-fit ​​rod 14 is provided on the side of the moving mold 6. An annular groove 15 is opened on the outer side of the snap-fit ​​rod 14. The snap-fit ​​assembly includes a component slot installed inside the fixed mold 8. A snap-fit ​​block 17 adapted to the annular groove 15 is connected inside the component slot by a spring 16. Rod slots adapted to the snap-fit ​​rod 14 are opened on both the top plate 7 and the fixed mold 8. A limit block 18 is installed on the side of the limiting mold 9. A sliding groove 19 is opened on the bottom side of the limit block 18. A through-hole groove adapted to the limit block 18 is opened on both the top plate 7 and the fixed mold 8. The moving mold 6 has a matching through groove, and the side end of the moving mold 6 has a limiting groove 21 that matches the limiting block 18. The fixed mold 8 has a slider 20 installed inside, and the top of the slider 20 is slidably connected to the sliding groove 19. The other side of the moving mold 6 has an air injection hole 25, which is connected to an external air pump. The moving mold 6 has an air injection groove 24 inside, and a matching moving plate 23 is installed inside the air injection groove 24. The side end of the moving plate 23 is connected to the side wall of the top plate 7 through a connecting rod 22. The frame 1 is moved to the required position. Through the cooperation of the guide rod and guide block in the mold box 5, the external telescopic cylinder drive mechanism drives the moving mold 6 and the top plate 7 to move towards and fit the fixed mold 8. At this time, the snap-fit ​​rod 14 on the side end of the moving mold 6 passes through the rod groove of the top plate 7 and the fixed mold 8. The snap-fit ​​block 17 in the accessory groove of the fixed mold 8 is in Under the action of spring 16, the spring engages with the annular groove 15 of the locking rod 14, achieving a three-way locking and fixing. Simultaneously, the limiting block 18 on the side end of the limiting mold 9 passes through the through grooves of the top plate 7 and the fixed mold 8, and embeds into the limiting groove 21 of the moving mold 6, completing the mold closing and positioning. This significantly improves the overall stability after mold closing and avoids dimensional deviations in the molded parts caused by mold offset during injection molding. Subsequently, the raw material in the feed hopper 2 enters the heating cylinder 3. The raw material for injection molding is plastic granules processed from recycled plastic waste, which not only realizes the resource utilization of waste and reduces the cost of raw material procurement, but also reduces the pollution of plastic waste to the environment. After being pushed by the screw 4 and heated and melted by the heating cylinder 3, it is injected into the main channel 10 of the limiting mold 9 through the end nozzle, and then enters the mold cavity 12 through the injection nozzle 11 of the fixed mold 8.At this point, module 13 of the moving mold 6 adapts to the mold cavity 12 to form the grass collection box molding cavity. After injection molding, the external cooling system cools the mold cavity 12. Timely cooling can accelerate the solidification and molding of the plastic melt. After cooling, the moving mold 6 is driven by the external telescopic cylinder drive mechanism to move the top plate 7 and the fixed mold 8 synchronously away from the limiting mold 9. The external structures are all existing technologies, so they will not be described in detail. At this time, the formed grass collection box moves synchronously with the main runner 10 and the excess material block in the injection nozzle 11, so that the main runner... 10 separates from the injection nozzle 11. Since the volume of the injection nozzle 11 is much smaller than that of the main runner 10, the excess material block falls under gravity after separation and enters the storage box 40 through the guide groove at the bottom of the mold box 5. The guide component 41 in the storage box 40 diverts and guides the excess material block to the subsequent demolding collection box, which facilitates the subsequent recycling and reuse of the excess material block and the sorting and storage of the collection box. The moving mold 6 drives the top plate 7 and the fixed mold 8 to continue moving, so that when the slider 20 in the fixed mold 8 moves with the whole to the end of the sliding groove 19 of the limiting block 18, the limiting block... 18 disengages from the leftmost end of the limiting groove 21 of the moving mold 6, and the moving mold 6 continues to move. The limiting block 18 disengages from the through groove of the top plate 7, and the locking rod 14 abuts against the locking block 17 in the accessory groove of the fixed mold 8, causing the locking block 17 to compress the upper spring 16. The annular groove 15 of the locking rod 14 separates from the locking block 17, facilitating the movement of the locking rod 14 out of the fixed mold 8. The entire locking and disengagement is automatic without manual intervention, realizing the automation of the demolding process and reducing the intensity of manual labor. At this time, the moving mold 6 only drives the top plate 7 to move, so that the module of the moving mold 6... Step 13 moves the grass collection box inside the mold cavity 12 out of the fixed mold 8. Finally, an external air pump injects air into the air injection hole 25 of the moving mold 6. The air enters the air injection groove 24 and pushes the moving plate 23. The moving plate 23 pushes the top plate 7 through the connecting rod 22. The top plate 7 slides on the surface of the module 13, pushing the grass collection box off the module 13. This avoids scratches or damage to the surface of the molded part caused by manual demolding, ensuring the appearance quality of the product. At the same time, it further improves the automation of the demolding process. The grass collection box falls into the storage box 40 through the guide groove and is diverted by the guide component 41.

[0025] Example 2: In this example, the arc block 30 at the top of the ejector pin 29 moves upward along the arc groove of the fixed mold 8, ejecting the excess material block in the injection nozzle 11. This not only prevents material block residue from clogging the injection nozzle 11, but also facilitates the separation of the excess material block from the grass collection box. This solves the problem of redundant processes requiring manual grinding of excess material blocks after the grass collection box is injection molded. Specifically, as follows... Figures 1-5 and Figures 10-12As shown, the following is disclosed: a storage groove 26 is provided inside the fixed mold 8, a sleeve 27 is installed inside the storage groove 26, an ejector rod 29 is movably connected inside the sleeve 27, an arc block 30 is installed at the top of the ejector rod 29, an arc groove is provided inside the fixed mold 8 and the arc groove is connected to the injection nozzle 11, the arc block 30 is located inside the arc groove, an air supply cylinder 32 is sleeved on the outside of the ejector rod 29, the inner cavity of the sleeve 27 is connected to the inner cavity of the air supply cylinder 32 through a delivery pipe 31, and a through groove is provided at the top of the air supply cylinder 32, and an auxiliary component is installed on the side of the sleeve 27, the auxiliary component including a mounting plate... An air supply pipe 28 is installed on the side of the sleeve 27. The air supply pipe 28 passes through the fixed mold 8 and is connected to an external air pump. The air supply pipe 28 is installed at a position lower than the interface position of the delivery pipe 31 on the side of the sleeve 27. After cooling is completed, the external air pump is started, and air is supplied to the sleeve 27 in the placement groove 26 of the fixed mold 8 through the air supply pipe 28. The air pushes the ejector rod 29 in the sleeve 27 to move upward. The arc block 30 at the top of the ejector rod 29 moves upward along the arc groove of the fixed mold 8, pushing out the excess material block in the injection nozzle 11, which not only avoids the material block residue clogging the injection nozzle. 11. Moreover, it facilitates the separation of excess material blocks from the collection box, solving the problem of redundant processes requiring manual grinding of excess material blocks after injection molding of the collection box. It effectively avoids the low production efficiency caused by cumbersome post-processing. After the push rod 29 moves up to the preset position, the inner cavity of the sleeve 27 is connected to the inner cavity of the air supply cylinder 32 outside the push rod 29 through the conveying pipe 31. At this time, gas is blown into the injection nozzle 11 through the through groove at the top of the air supply cylinder 32. The air blowing structure can further clean the residual material debris in the injection nozzle 11, and at the same time accelerate the removal of excess material blocks. The falling separation improves the thoroughness of material block cleaning, reduces the frequency of mold maintenance, and the excess material blocks fall into the storage box 40. After being diverted by the guide component 41, when the air pump stops supplying air, the ejector rod 29 and the arc block 30 are reset by reverse adsorption of the air pump. At this time, the arc block 30 re-blocks the arc groove, and the top through groove of the air supply cylinder 32 is closed. The design of the reset structure can ensure that each part of the mold returns to the initial mold closing state, avoids the misalignment of parts affecting the subsequent mold closing accuracy, and improves the adaptability of the equipment. The rest of the operation process is the same as the demolding process of the grass box in Embodiment 1.

[0026] Example 3: In this example, the automatic intake of gas is achieved by utilizing the driving force of the slider 20 during the mold closing process, eliminating the need for an additional air pump drive structure and realizing the rational utilization of energy. Specifically, as follows... Figures 1-6 and Figures 13-16As shown, the auxiliary components include a second pipe 35 and a third pipe 39 installed on the side of the sleeve 27. Both the second pipe 35 and the third pipe 39 are equipped with one-way valves. The installation positions of the second pipe 35 and the third pipe 39 are lower than the interface position of the conveying pipe 31 on the side of the sleeve 27. An air supply assembly is installed inside the fixed mold 8. The air supply assembly includes a conveying cylinder 33 installed inside the fixed mold 8. The input end of the conveying cylinder 33 is connected to the external environment through a first pipe 34, and the output end of the conveying cylinder 33 is connected to the side of the sleeve 27 through the second pipe 35. A one-way valve is installed on the first pipe 34. A piston 36 is connected through the inside of the conveying cylinder 33. A first magnetic block 37 is installed at the end of the piston 36. A magnetically connected element is provided on the side of the slider 20. The second magnetic block 38 is attracted by the magnetic attraction. A guide groove is provided at the bottom of the mold closing box 5. A storage box 40 is installed inside the frame 1. The storage box 40 is located on the lower surface of the guide groove. A guide component 41 is installed inside the storage box 40. When the mold is closed as a whole, the moving mold 6 drives the top plate 7 and the fixed mold 8 to move towards the limiting mold 9. At this time, the slider 20 in the fixed mold 8 moves with the whole. The second magnetic block 38 on the side of the slider 20 is magnetically attracted to the first magnetic block 37 at the end of the piston 36 in the conveying cylinder 33. During the continued movement, the slider 20 drives the piston 36 to slide in the conveying cylinder 33, so that the conveying cylinder 33 draws in external gas through the first pipe 34 with a one-way valve. The automatic gas intake is achieved by using the driving force of the slider 20 during the mold closing process, without the need for an additional air pump to drive the gas intake. This structure achieves efficient energy utilization. When the slider 20 moves to the middle of its stroke, the first magnetic block 37 and the second magnetic block 38 disengage, the piston 36 stops moving, and the conveying cylinder 33 stops intake and delivery of gas. After cooling is complete, when the slider 20 moves in the opposite direction to the middle of its stroke, the second magnetic block 38 on the side of the slider 20 magnetically connects with the first magnetic block 37 at the end of the piston 36 inside the conveying cylinder 33. The slider 20 continues to move, causing the piston 36 to move inside the conveying cylinder 33, facilitating the delivery of gas through the second pipe 35 to the inside of the sleeve 27. The gas pushes the push rod 29 upward, and the arc block 30 pushes out excess material from the injection nozzle 11. After the push rod 29 moves upward, the gas inside the sleeve 27 enters the gas delivery cylinder 32 through the conveying pipe 31, and then flows from the top slot of the gas delivery cylinder 32 to the injection nozzle. 11. Air is blown to accelerate the separation and falling of excess material blocks. The excess material blocks are diverted through the guide groove, storage box 40 and guide member 41. When the first magnetic block 37 and the second magnetic block 38 are separated from adsorption, the piston 36 will stop moving, the conveying cylinder 33 will stop air intake and air delivery, and the residual gas in the sleeve 27 will be adsorbed through the third pipe 39, so that the ejector rod 29 and the arc block 30 will be reset. The gas will be discharged through the third pipe 39 with a one-way valve. The one-way valve can ensure the one-way flow of gas and avoid the gas backflow from affecting the ejection effect and reset stability of the ejector rod 29. At the same time, the timely discharge of residual gas can avoid the excessive air pressure inside the mold from affecting the subsequent mold closing operation. The arc block 30 blocks the arc groove, and the top through groove of the air delivery cylinder 32 is closed. The remaining operation process is the same as the demolding process of the grass box in Embodiment 1.

[0027] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An injection molding machine for producing a grass collection box for a lawnmower, comprising a frame (1), on which a mold box (5) is mounted, and a limiting mold (9) is provided on the side end of the mold box (5), characterized in that, The limiting mold (9) has a main channel (10) inside. One side of the main channel (10) is connected to the nozzle at the end of the heating cylinder (3). The mold assembly is provided inside the mold box (5). The mold assembly includes a moving mold (6) installed inside the mold box (5). A top plate (7) is provided on the side of the moving mold (6). A fixed mold (8) is provided on the side of the top plate (7). An injection nozzle (11) and a mold cavity (12) are provided inside the fixed mold (8). The injection nozzle (11) and the mold cavity (12) are connected. The injection nozzle (11) is located on the other side of the main channel (10). The volume of the injection nozzle (11) is smaller than the volume of the main channel (10). A snap-fit ​​assembly is installed inside the fixed mold (8). The moving mold (6) is provided with a snap-fit ​​rod (14) on its side. The top plate (7) and the fixed mold (8) are provided with rod grooves that are compatible with the snap-fit ​​rod (14). The limiting mold (9) is provided with a limiting block (18) on its side. The bottom side of the limiting block (18) is provided with a sliding groove (19). The top plate (7) and the fixed mold (8) are provided with through grooves that are compatible with the limiting block (18). The moving mold (6) is provided with a limiting groove (21) that is compatible with the limiting block (18). The fixed mold (8) is provided with a slider (20) inside. The top of the slider (20) is slidably connected to the inside of the sliding groove (19). The fixed mold (8) has a storage slot (26) inside, and a sleeve (27) is installed inside the storage slot (26). A push rod (29) is movably connected inside the sleeve (27). An arc block (30) is installed at the top of the push rod (29). An arc groove is opened inside the fixed mold (8), and the arc groove is connected to the injection nozzle (11). The arc block (30) is located inside the arc groove. An air supply cylinder (32) is sleeved on the outside of the push rod (29). The inner cavity of the sleeve (27) is connected to the inner cavity of the air supply cylinder (32) through a delivery pipe (31). A through groove is opened at the top of the air supply cylinder (32). An auxiliary component is installed on the side of the sleeve (27). The auxiliary components include a second pipe (35) and a third pipe (39) installed on the side of the sleeve (27). Both the second pipe (35) and the third pipe (39) are equipped with check valves. The installation positions of the second pipe (35) and the third pipe (39) are lower than the interface position of the conveying pipe (31) on the side of the sleeve (27). An air supply assembly is installed inside the fixed mold (8). The air supply assembly includes a conveying cylinder (33) installed inside the fixed mold (8). The input end of the conveying cylinder (33) is connected to the external environment through a first pipe (34). The output end of the conveying cylinder (33) is connected to the side end of the sleeve (27) through a second pipe (35). A one-way valve is provided on the first pipe (34). A piston (36) is connected through the inside of the conveying cylinder (33). A first magnetic block (37) is installed at the end of the piston (36). A second magnetic block (38) is provided on the side end of the slider (20) and is attracted to the first magnetic block (37).

2. The injection molding machine for producing a lawnmower hay collection box according to claim 1, characterized in that: A heating cylinder (3) is provided on the side of the mold box (5). A screw (4) is installed inside the heating cylinder (3). A feed hopper (2) is connected to the upper end of the heating cylinder (3). The nozzle at the end of the heating cylinder (3) is connected to the side of the mold box (5).

3. The injection molding machine for producing a lawnmower hay collection box according to claim 1, characterized in that: The moving mold (6) is equipped with a module (13) that is compatible with the mold cavity (12) on one side. The moving mold (6), the top plate (7) and the fixed mold (8) are all provided with guide blocks. The mold box (5) is provided with guide rods that pass through the guide blocks on both the upper and lower sides. The snap-fit ​​rod (14) has an annular groove (15) on its outer side. The snap-fit ​​assembly includes a fitting slot installed inside the fixed mold (8). The fitting slot is connected to a snap-fit ​​block (17) that is compatible with the annular groove (15) by a spring (16).

4. The injection molding machine for producing a lawnmower hay collection box according to claim 1, characterized in that: The moving mold (6) has an air injection hole (25) on the other side, which is connected to an external air pump. The moving mold (6) has an air injection groove (24) inside, and a matching movable plate (23) is installed inside the air injection groove (24). The side end of the movable plate (23) is connected to the side wall of the top plate (7) through a connecting rod (22).

5. The injection molding machine for producing a lawnmower hay collection box according to claim 1, characterized in that: The auxiliary component includes an air supply pipe (28) installed on the side of the sleeve (27). The air supply pipe (28) passes through the fixed mold (8) and is connected to an external air pump. The air supply pipe (28) is installed at a position lower than the interface position of the delivery pipe (31) on the side of the sleeve (27).

6. The injection molding machine for producing a lawnmower hay collection box according to claim 1, characterized in that: The bottom of the mold box (5) is provided with a guide groove, and a storage box (40) is installed inside the frame (1). The storage box (40) is located on the lower surface of the guide groove, and a guide component (41) is installed inside the storage box (40).

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