Injection mold for mower accessory machining

Abstract

The injection mold comprises a fixed mold body and a movable mold body which are installed on an injection molding machine, a forming cavity matched with the movable mold body is formed in the outer surface of the fixed mold body, and the fixed mold body is divided into a first mold body and a second mold body; the movable mold is divided into a third mold body and a fourth mold body, a positioning rod is fixedly installed on the side face of the movable mold, and the positioning rod corresponds to a positioning block fixedly installed on the side face of the fixed mold. According to the injection mold for mower accessory machining, when raw materials are injected into the mold cavity, the telescopic rod is used for pushing the fixing rod to move downwards and be inserted into the injection hole, the fixing rod is fixed to connecting waste of a product after cooling forming, and when the product is ejected out through a first ejection block in the mold, due to the fact that the connecting waste is fixed, only the product can be ejected out; and then the product waste is ejected out through the second ejection block, and follow-up waste recycling is facilitated.

Description

Technical Field

[0001] This invention relates to the field of lawnmower manufacturing technology, specifically to an injection mold for processing lawnmower parts. Background Technology

[0002] A lawnmower is a device used to trim lawns. During its production, its plastic parts, such as storage tanks and outer shells, are generally molded in one piece using injection molding, which involves injecting molten plastic into a mold and shaping it using the cavity inside the mold.

[0003] As in the prior art, Chinese Patent Application No. CN201410000296.7 discloses a mold for manufacturing the upper housing of a lawnmower. The present invention includes a fixed mold assembly and a moving mold assembly. The fixed mold assembly includes a fixed template and a fixed mold cavity. The moving mold assembly includes a moving template, an ejection mechanism, and a moving mold cavity. A large insert is provided in the moving mold cavity. A cavity that mates with the large insert is provided in the fixed mold cavity and the moving mold cavity. A driving device is provided on one side of the fixed mold cavity and the moving mold cavity. The driving device includes a transverse insert located on one side of the large insert. A driving block is connected to one end of the transverse insert. An auxiliary insert is provided outside the large insert. The large insert mates with the main body of the lawnmower upper housing. The driving device mates with the upper front shell and the upper end of the product. The auxiliary insert mates with the holes on the edges and side walls of the product.

[0004] For example, in the prior art, Chinese patent application number CN201921731729.0 discloses a lawnmower handle molding structure, including an upper mold base and a lower mold base. A concave mold and a convex mold are fixedly installed on opposite sides of the upper mold base and the lower mold base, respectively. The concave mold and the convex mold are sealed and connected to form a molding cavity. Two symmetrically distributed injection cylinders are fixedly installed on the upper end face of the upper mold base. An injection main channel corresponding to the injection cylinders is opened on the upper mold base. By setting two symmetrically distributed injection holes on the upper mold base, the injection speed is accelerated, so that the plastic melt can quickly and timely fill the molding cavity, preventing the product surface density from being insufficient due to too slow injection speed and the generation of silver streaks. Furthermore, an injection auxiliary channel is provided at the output end of the injection main channel, so that the melt can be evenly delivered into the molding cavity.

[0005] For example, in the prior art, Chinese patent application number CN202421885555.4 discloses a contour silicone mold for a lawnmower component, including a base plate. Support plates are connected to both sides of the upper end of the base plate. Through the cooperation of the set pallet, mounting groove, mounting block, mold body, feed pipe, electric telescopic rod, locking block and locking groove, the mold body is easily fixed in the mounting groove, so that the mold is located at the lower end of the hose, and the material is quickly fed into the two molds. After injection molding, the mold can be removed, improving the production efficiency of the lawnmower component. Through the cooperation of the set motor, pallet, storage cylinder, feeding pipe, connecting pipe, conveying pipe, hose, hydraulic cylinder and fixing plate, the material is easily conveyed to the inside of the two molds through the conveying pipe.

[0006] Based on the above information, it can be seen that the plastic parts of lawnmowers in the prior art are generally produced by injection molding. However, in actual use, after the injection mold is completed, there will be some connecting waste at the joint of the finished product. The mold in the prior art ejects the finished product and the connecting waste together, which is not convenient for subsequent waste recycling. Summary of the Invention

[0007] The purpose of this invention is to provide an injection mold for processing lawnmower parts, so as to solve the problem of inconvenience in waste recycling mentioned in the background art.

[0008] To achieve the above objectives, the present invention provides the following technical solution: an injection mold for processing lawnmower parts, comprising a fixed mold and a movable mold mounted on an injection molding machine. The fixed mold has a molding cavity on its outer surface that mates with the movable mold. A first ejector block is installed inside the molding cavity. The fixed mold is divided into a first mold body and a second mold body, and the movable mold is divided into a third mold body and a fourth mold body. An injection hole is provided inside the second mold body, and an injection tube is fixedly installed inside the first mold body, with the injection tube corresponding to the injection hole. A positioning rod is fixedly installed on the side of the movable mold, and the positioning rod corresponds to a positioning block fixedly installed on the side of the fixed mold. The outer surface of the second mold body... A telescopic rod is fixedly installed, and a fixed column is fixedly installed at the lower end of the telescopic rod. The fixed column is inserted into the injection hole to fix the product waste. The telescopic rod pushes the fixed rod downward and inserts it into the injection hole. After cooling and molding, the fixed rod is fixed to the connecting waste of the product. When the first ejector block in the mold ejects the product, the connecting waste is fixed, so only the product can be ejected, so that the product and the connecting waste are automatically separated. The fixed column is connected to an auxiliary cooling mechanism, which assists in cooling the product waste. Water coolant is used to cool the heat exchange tube. The cooled air is transported to the fixed column through the connecting pipe to cool the fixed column, thereby using the fixed column to assist in cooling the product waste in the injection hole.

[0009] Preferably, a connecting column that slides through the third mold body is fixedly installed on the outer surface of the fourth mold body, and a buffer spring is provided on the outside of the connecting column.

[0010] Preferably, a first water-cooling pipe is installed above the fourth mold body, and a second water-cooling pipe is installed at the upper end of the first mold body. A first connecting pipe and a second connecting pipe are fixedly installed on the surface of the first mold body.

[0011] Preferably, the first connecting pipe is connected to the upper end of the liquid cooling channel opened inside the second mold body through a connecting hole, and the lower end of the liquid cooling channel is connected to the second connecting pipe through a connecting hole. The second connecting pipe is connected to the insulation pipe wrapped around the outside of the injection pipe. The coolant in the second connecting pipe eventually flows into the insulation pipe. The coolant after heat exchange has a certain temperature, which can achieve the purpose of heat preservation of the mold in the injection pipe, thus avoiding blockage caused by the cooling and solidification of the plastic raw material in the injection pipe.

[0012] Preferably, the auxiliary cooling mechanism includes a connecting pipe communicating with the fixed column, and the connecting pipe is connected to a heat exchange pipe fixedly installed inside the first mold body, and the heat exchange pipe corresponds to the position of the first connecting pipe.

[0013] Preferably, a piston plate is slidably connected to the fixed column, and a connecting rod is fixedly installed on the lower surface of the piston plate. A return spring is installed on the outside of the connecting rod, and a striking block is fixedly installed at the lower end of the connecting rod. The striking block corresponds to the extrusion block, and the extrusion block is fixedly installed on the inner wall of the fixed column at equal intervals. Under the elastic action of the return spring, the piston plate is pulled downward. The piston plate drives the striking block to move synchronously through the connecting rod. By utilizing the correspondence between the striking block and the extrusion block, the fixed column is struck, causing the fixed column to vibrate and loosening the product waste between the fixed column and the injection hole.

[0014] Preferably, a flow guide is fixedly installed on the upper end of the fixed column, and the second mold body has an air-cooling channel and a connecting groove inside.

[0015] Preferably, the flow guide shroud moves to the upper end following the fixed column and corresponds to the connecting groove, and moves to the lower end following the fixed column and corresponds to the air-cooling channel.

[0016] Preferably, a second ejector block for ejecting product waste is installed on the inner side of the bottom of the connecting groove, and a connecting spring is fixedly installed between the second ejector block and the inner wall of the connecting groove.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows: the injection mold for processing lawnmower parts adopts a novel structural design, the specific details of which are as follows: 1. When the raw material is injected into the cavity, the telescopic rod is used to push the fixed rod downward and insert it into the injection hole. After cooling and molding, the fixed rod is fixed to the connecting waste of the product. When the first ejector block in the mold ejects the product, the connecting waste is fixed, so only the product can be ejected, so that the product and the connecting waste are automatically separated. Then the second ejector block is used to eject the product waste, which is convenient for subsequent waste recycling. Furthermore, the fixed column is connected to the auxiliary cooling mechanism. An air pump is used to deliver air to the heat exchange tube, and the heat exchange tube is cooled by water coolant. The cooled air is then delivered to the inside of the fixed column through the connecting pipe to cool the fixed column. This allows the fixed column to assist in cooling the product waste in the injection hole, creating a temperature difference between the product waste and the product body. As a result, the product solidifies to different degrees, facilitating the subsequent separation of the product and the product waste.

[0018] 2. The coolant flows out of the first connecting pipe through the second coolant pipe, then enters the liquid cooling channel through the connecting hole, and finally enters the second connecting pipe through the connecting hole. The coolant in the liquid cooling pipe cools the mold. The coolant in the second connecting pipe finally flows into the insulation pipe. The coolant after heat exchange has a certain temperature, which can keep the mold in the filling pipe warm and prevent the plastic material in the filling pipe from cooling and solidifying and causing blockage.

[0019] 3. When air is injected into the fixed column through the connecting tube, the piston plate is pushed upward under the action of air pressure. After the injection is completed, the air injection is stopped. At this time, the piston plate is pulled downward under the elastic action of the return spring. The piston plate drives the striking block to move synchronously through the connecting rod. The corresponding action between the striking block and the extrusion block strikes the fixed column, causing the fixed column to vibrate and loosening the product waste between the fixed column and the injection hole, reducing adhesion. Furthermore, after the fixed column is pulled out of the injection hole, the flow guide moves upward with the fixed column to the position corresponding to the connecting groove. Then, air is introduced into the fixed column, and the airflow enters the interior of the connecting groove through the flow guide, pushing out the second ejector block inside the lower end of the connecting groove. The second ejector block is used to eject the product waste. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the movable mold structure of the present invention; Figure 3 This is an exploded view of the fixed mold structure of the present invention; Figure 4 This is a schematic diagram of the connecting hole structure of the present invention; Figure 5 This is a schematic diagram of the liquid cooling channel structure of the present invention; Figure 6This is a schematic diagram of the installation position of the fixed column in this invention; Figure 7 This is a schematic diagram of the heat exchanger tube structure of the present invention; Figure 8 This is a schematic diagram of the internal structure of the fixing column of the present invention; Figure 9 For the present invention Figure 8 Enlarged structural diagram at point A in the middle; Figure 10 This is a schematic diagram of the air-cooling channel and connecting groove structure of the present invention; Figure 11 This is a schematic diagram of the installation position structure of the second ejector block in this invention; Figure 12 For the present invention Figure 11 Enlarged structural diagram at point B.

[0021] In the diagram: 1. Fixed mold; 101. First mold body; 102. Second mold body; 2. Movable mold; 201. Third mold body; 202. Fourth mold body; 3. First water-cooling pipe; 4. Positioning rod; 5. Positioning block; 6. Molding cavity; 601. First ejector block; 7. Connecting column; 8. Buffer spring; 9. Injection hole; 10. Filling pipe; 11. Second water-cooling pipe; 12. First connecting pipe; 13. Connecting hole; 14. Liquid cooling channel; 15. Second connecting pipe; 16. Insulation pipe; 17. Telescopic rod; 18. Fixed column; 19. Connecting pipe; 20. Heat exchanger pipe; 21. Piston plate; 22. Connecting rod; 23. Return spring; 24. Impact block; 25. Extrusion block; 26. Flow guide; 27. Air-cooling channel; 28. Connecting groove; 29. ​​Second ejector block; 30. Connecting spring. Detailed Implementation

[0022] 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.

[0023] Example 1: Please refer to Figures 1-3 and Figure 6To facilitate waste recycling, this embodiment provides the following technical solution, specifically: It includes a fixed mold 1 and a movable mold 2 installed on an injection molding machine. The outer surface of the fixed mold 1 has a molding cavity 6 that mates with the movable mold 2. A first ejector block 601 is installed inside the molding cavity 6. The fixed mold 1 is divided into a first mold body 101 and a second mold body 102. The movable mold 2 is divided into a third mold body 201 and a fourth mold body 202. An injection hole 9 is provided inside the second mold body 102, and an injection tube 10 is fixedly installed inside the first mold body 101. Corresponding to the position of injection hole 9, a positioning rod 4 is fixedly installed on the side of the movable mold 2, and the positioning rod 4 corresponds to the positioning block 5 fixedly installed on the side of the fixed mold 1. A telescopic rod 17 is fixedly installed on the outer surface of the second mold body 102, and a fixing column 18 is fixedly installed at the lower end of the telescopic rod 17. The fixing column 18 is inserted into the injection hole 9 to fix the product waste. The fixing column 18 is connected to the auxiliary cooling mechanism, and the auxiliary cooling mechanism is used to assist in cooling the product waste. A connecting column 7 that slides through the third mold body 201 is fixedly installed on the outer surface of the fourth mold body 202, and a buffer spring 8 is provided on the outside of the connecting column 7.

[0024] During the injection molding production of plastic parts for lawnmowers, the drive mechanism in the injection molding machine first moves the movable mold 2 closer to the fixed mold 1. At this time, the positioning rod 4 is inserted into the corresponding positioning block 5 for positioning and guidance. Finally, the movable mold 2 and the fixed mold 1 are closed (when the movable mold 2 contacts the fixed mold 1, the connecting post 7 outside the fourth mold body 202 slides between the third mold body 201 and the compression buffer spring 8, using the buffering effect of the buffer spring 8 to reduce the impact wear of the mold during mold closing). After the mold is closed, the injection unit of the injection molding machine injects the flowing raw material through the injection molding machine. Injection tube 10 injects into injection hole 9, and finally into molding cavity 6 through injection hole 9. At the same time, telescopic rod 17 pushes fixed post 18 into injection hole 9. After injection, the product connecting waste inside injection hole 9 is connected to fixed post 18. After the product cools and solidifies, the first ejector block 601 ejects the product. At this time, since fixed post 18 fixes the connecting waste, the first ejector block 601 only ejects the product body, realizing automatic separation of waste. After the product is removed, telescopic rod 17 drives fixed post 18 to retract and loosen the fixation of connecting waste, which facilitates subsequent waste recycling.

[0025] Example 2: Please refer to Figures 4-5 , Figures 7-8 and Figures 10-12To facilitate the separation of waste and product, this embodiment provides the following technical solution: a first water-cooling pipe 3 is installed above the fourth mold 202, and a second water-cooling pipe 11 is installed at the upper end of the first mold 101. A first connecting pipe 12 and a second connecting pipe 15 are fixedly installed on the surface of the first mold 101. The first connecting pipe 12 is connected to the upper end of a liquid-cooling channel 14 opened inside the second mold 102 through a connecting hole 13, and the lower end of the liquid-cooling channel 14 is connected to the second connecting pipe 15 through a connecting hole 13. The second connecting pipe 15 is connected to an insulation pipe 16 wrapped around the outside of the filling pipe 10. The auxiliary cooling mechanism includes a connection to a fixed column 1. The connecting pipe 19 is connected to the heat exchange pipe 20 fixedly installed inside the first mold body 101, and the heat exchange pipe 20 corresponds to the position of the first connecting pipe 12. A guide shroud 26 is fixedly installed on the upper end of the fixed column 18, and an air-cooling channel 27 and a connecting groove 28 are opened inside the second mold body 102. After the guide shroud 26 moves to the upper end with the fixed column 18, it corresponds to the connecting groove 28. After the guide shroud 26 moves to the lower end with the fixed column 18, it corresponds to the air-cooling channel 27. A second ejection block 29 for ejecting product waste is installed on the inner side of the bottom of the connecting groove 28, and a connecting spring 30 is fixedly installed between the second ejection block 29 and the inner wall of the connecting groove 28.

[0026] After the product is injected into the molding cavity 6, a water pump injects coolant into the second water-cooling pipe 11. The coolant in the second water-cooling pipe 11 enters the liquid-cooling channel 14 through the first connecting pipe 12 and the connecting hole 13. After flowing in the liquid-cooling channel 14, the coolant flows into the second connecting pipe 15 through the connecting hole 13. The coolant in the liquid-cooling channel 14 is used to cool the inside of the fixed mold 1. The principle of the first water-cooling pipe 3 is the same as that of the second water-cooling pipe 11, achieving the purpose of cooling the movable mold 2. The coolant after heat exchange flows into the insulation pipe 16, which is used to insulate the injection pipe 10 to prevent the plastic material in the injection pipe 10 from cooling and solidifying, causing blockage. During the mold cooling process, an air pump delivers air to the heat exchange pipe 20, and the coolant in the heat exchange pipe 20 is used to cool the air. The cooled air is then connected to the second connecting pipe 20. The tube 19 delivers the product to the inside of the fixed column 18, cooling the fixed column 18. The fixed column 18 is used to assist in cooling the product waste in the injection hole 9, creating a temperature difference between the product waste and the product, resulting in different degrees of solidification. This facilitates the subsequent separation of the product and the waste. At this time, the guide hood 26 at the upper end of the fixed column 18 corresponds to the air cooling channel 27. The air in the fixed column 18 enters the air cooling channel 27 through the guide hood 26, further cooling the injection hole 9. After the product and waste are separated, the fixed column 18 is pulled out of the injection hole 9 using the telescopic rod 17. At this time, the guide hood 26 moves upward with the fixed column 18 to the position corresponding to the connecting groove 28. The air in the fixed column 18 flows into the connecting groove 28 through the guide hood 26, using the airflow to push the second ejector block 29, which then ejects the product waste.

[0027] Example 3: Please refer to Figures 8-9 In order to achieve the purpose of ejecting waste, this embodiment provides the following technical solution, which specifically discloses: a piston plate 21 is installed inside the fixed column 18 and is slidably connected thereto, and a connecting rod 22 is fixedly installed on the lower surface of the piston plate 21, and a return spring 23 is installed on the outside of the connecting rod 22. A striking block 24 is fixedly installed at the lower end of the connecting rod 22, and the striking block 24 corresponds to the position of the extrusion block 25. The extrusion block 25 is fixedly installed on the inner wall of the fixed column 18 at equal intervals.

[0028] When air is injected into the fixed column 18, the air pressure pushes the piston plate 21 upward. Before the fixed column 18 is pulled out of the injection hole 9, the injection of air into the fixed column 18 is briefly stopped. At this time, under the elastic action of the return spring 23, the piston plate 21 is pulled downward. The piston plate 21 drives the striking block 24 to move synchronously through the connecting rod 22. The striking block 24 and the extrusion block 25 are used to extrude the fixed column 18, causing the fixed column 18 to vibrate. The vibration is used to loosen the product waste in the injection hole 9 and prevent it from sticking and affecting the extraction of the fixed column 18.

[0029] In the description of this invention, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0030] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An injection mold for processing lawnmower parts, comprising a fixed mold (1) and a movable mold (2) mounted on an injection molding machine, wherein the outer surface of the fixed mold (1) has a molding cavity (6) that mates with the movable mold (2), and a first ejector block (601) is installed inside the molding cavity (6), characterized in that, Also includes: The fixed mold (1) is divided into two parts: a first mold body (101) and a second mold body (102). The movable mold (2) is divided into two parts: a third mold body (201) and a fourth mold body (202). The second mold body (102) has an injection hole (9) inside, and the first mold body (101) has an injection tube (10) fixedly installed inside. The injection tube (10) corresponds to the position of the injection hole (9). The movable mold (2) is fixedly installed with a positioning rod (4) on its side, and the positioning rod (4) corresponds to the positioning block (5) fixedly installed on the side of the fixed mold (1); The second mold body (102) has a telescopic rod (17) fixedly installed on its outer surface, and a fixing column (18) is fixedly installed at the lower end of the telescopic rod (17). The fixing column (18) is inserted into the injection hole (9) to fix the product waste. The fixing column (18) is connected to the auxiliary cooling mechanism to assist in cooling the product waste.

2. The injection mold for processing lawnmower parts according to claim 1, characterized in that: The fourth module (202) has a connecting column (7) that slides through the third module (201) fixedly installed on its outer surface, and a buffer spring (8) is provided on the outside of the connecting column (7).

3. The injection mold for processing lawnmower parts according to claim 2, characterized in that: A first water-cooling pipe (3) is installed above the fourth mold (202), and a second water-cooling pipe (11) is installed at the upper end of the first mold (101). A first connecting pipe (12) and a second connecting pipe (15) are fixedly installed on the surface of the first mold (101).

4. The injection mold for processing lawnmower parts according to claim 3, characterized in that: The first connecting pipe (12) is connected to the upper end of the liquid cooling channel (14) opened inside the second mold body (102) through the connecting hole (13), and the lower end of the liquid cooling channel (14) is connected to the second connecting pipe (15) through the connecting hole (13), and the second connecting pipe (15) is connected to the heat insulation pipe (16) wrapped around the outside of the filling pipe (10).

5. The injection mold for processing lawnmower parts according to claim 1, characterized in that: The auxiliary cooling mechanism includes a connecting pipe (19) that communicates with the fixed column (18), and the connecting pipe (19) is connected to a heat exchange pipe (20) that is fixedly installed inside the first mold body (101), and the heat exchange pipe (20) corresponds to the position of the first connecting pipe (12).

6. The injection mold for processing lawnmower parts according to claim 5, characterized in that: The fixed column (18) is equipped with a piston plate (21) that is slidably connected to it, and a connecting rod (22) is fixedly installed on the lower surface of the piston plate (21), and a return spring (23) is installed on the outside of the connecting rod (22).

7. The injection mold for processing lawnmower parts according to claim 6, characterized in that: A striking block (24) is fixedly installed at the lower end of the connecting rod (22), and the striking block (24) corresponds to the squeezing block (25) in position, and the squeezing block (25) is fixedly installed at equal intervals on the inner wall of the fixed column (18).

8. The injection mold for processing lawnmower parts according to claim 7, characterized in that: The upper end of the fixed column (18) is fixedly installed with a flow guide (26), and the second mold body (102) has an air cooling channel (27) and a connecting groove (28) inside.

9. The injection mold for processing lawnmower parts according to claim 8, characterized in that: The air guide (26) moves to the upper end with the fixed column (18) and corresponds to the connecting groove (28). The air guide (26) moves to the lower end with the fixed column (18) and corresponds to the air cooling channel (27).

10. The injection mold for processing lawnmower parts according to claim 9, characterized in that: A second ejection block (29) for ejecting product waste is installed on the inner side of the bottom of the connecting groove (28), and a connecting spring (30) is fixedly installed between the second ejection block (29) and the inner wall of the connecting groove (28).

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