A polyurethane injection molding machine

Abstract

The utility model provides a kind of polyurethane injection molding machine, it is related to injection molding machine technical field, including: cabinet, cabinet top is equipped with injection molding box, fixed mould and movable mould are equipped in injection molding box inside, equipment box is equipped in injection molding box side, injection molding mechanism is equipped in equipment box side, feeding cylinder is equipped on injection molding mechanism, the blanking tube of feeding cylinder bottom is connected with the inside of injection molding mechanism.The kind of injection molding machine is screened to polyurethane raw material particle by crushing device, and the qualified particle is directly put into injection molding mechanism, and the large particle is crushed into small particle, so that polyurethane raw material particle can be completely melted, avoid to cause adverse effect to plastic mold quality, save electric energy, secondly, cooling and temperature rising can be carried out to fixed mould and movable mould by temperature control component, so as to be convenient for injection molding piece rapid cooling forming, and fixed mould and movable mould can be preheated, improve practicality.

Description

Technical Field

[0001] This utility model relates to the field of injection molding machine technology, specifically a polyurethane injection molding machine. Background Technology

[0002] Injection molding machines are the main molding equipment used to make various shapes of plastic products from thermoplastic or thermosetting plastics using plastic molds. They can heat the plastic, apply high pressure to the molten plastic, and make it eject and fill the mold cavity. Polyurethane (PU) is short for polyurethane, a new type of organic polymer material, known as the "fifth largest plastic". Due to its excellent performance, it is widely used in many fields of the national economy.

[0003] Injection molding machines are required during the processing of polyurethane plastics. However, due to the varying particle sizes of polyurethane raw materials, larger particles require a longer melting time than smaller particles. With existing technology, after a fixed heating time, a small portion of the raw material may not completely melt, negatively impacting the quality of the subsequent mold. Extending the heating time increases energy consumption. Furthermore, some existing injection molding machines require cooling after injection before final molding, but the slow cooling rate reduces equipment efficiency. Additionally, the lack of preheating after mold cooling affects the fluidity of the polyurethane solution, impacting the molding of the injection-molded parts. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a polyurethane injection molding machine, which uses a crushing device to screen polyurethane raw material particles, and the qualified particles are directly fed into the injection molding mechanism. The large particles screened out are crushed into small particles, so that the polyurethane raw material particles can be completely melted, avoiding adverse effects on the quality of the mold and saving energy. Secondly, the temperature control component can cool and heat the fixed mold and the movable mold to facilitate rapid cooling and molding of the injection molded parts, and can also preheat the fixed mold and the movable mold, thereby improving the practical performance.

[0005] The technical problem to be solved by this utility model is achieved by the following technical solution:

[0006] A polyurethane injection molding machine includes: a cabinet, an injection box on the top of the cabinet, a fixed mold and a movable mold inside the injection box, an equipment box on one side of the injection box, an injection mechanism on one side of the equipment box, a feeding cylinder on the injection mechanism, and a feeding pipe at the bottom of the feeding cylinder connected to the interior of the injection mechanism.

[0007] A crushing device is provided inside the feeding cylinder and is used to crush large raw materials into small particles. The crushing device includes: a separating plate, a screening plate, a partition plate, a guide plate, and a crushing roller.

[0008] A temperature control component, located inside the cabinet, is used to regulate the temperature of the fixed mold and the movable mold. The temperature control component includes: a high-frequency servo valve, a cold water pipe, a hot water pipe, a connector a, a delivery pipe, and a heat exchange cylinder.

[0009] Furthermore, a material distribution plate is fixedly connected between the inner walls of opposite sides of the feeding cylinder. The material distribution plate has two symmetrically arranged screening plates, which are arranged in a V-shape. A partition is fixedly connected to the bottom end of each screening plate. The screening plates and the partitions are respectively connected to the inner wall of the feeding cylinder. A guide plate is fixedly connected to one side of each partition. Two crushing rollers are provided between the two guide plates. The two crushing rollers are rotatably connected to the inner wall of the feeding cylinder at opposite ends.

[0010] Furthermore, the cabinet is equipped with a high-frequency servo valve, and the top of the high-frequency servo valve is equipped with a cold water pipe and a hot water pipe. One end of the cold water pipe and the hot water pipe extends to the outside and is fixedly installed with a connector a. A delivery pipe is provided on one side of the high-frequency servo valve. Heat exchange cylinders are fitted on the outside of both the fixed mold and the movable mold. One end of the delivery pipe is connected to the two heat exchange cylinders respectively.

[0011] Furthermore, a housing is fixedly installed outside the feeding pipe of the feeding cylinder, and the rotating shafts of the two crushing rollers extend to the housing and are fixedly connected to gears. The two gears mesh with each other, and a drive motor a is fixedly installed outside the housing. The drive shaft of the drive motor a is connected to the rotating shaft of one of the gears.

[0012] Furthermore, a drive motor b is fixedly installed at the top of the feeding cylinder, the drive shaft at the bottom of the drive motor b extends into the inside of the feeding cylinder, and a stirring rod is fixedly installed at the bottom end of the drive shaft of the drive motor b.

[0013] Furthermore, a water pump is provided on one side of the high-frequency servo valve. The input end of the water pump is connected to the high-frequency servo valve, and a drain pipe is fixedly installed at the output end of the water pump. One end of the drain pipe extends to the outside and is fixedly installed with a connector b.

[0014] Furthermore, two fixing plates are fixedly installed inside the injection molding box, and the fixed mold is fixedly installed on the fixing plates and the injection molding box. Multiple guide rods are fixedly installed between the inner walls of opposite sides of the two fixing plates. The movable mold is slidably connected to the outside of the multiple guide rods. A hydraulic cylinder is provided on one side of the injection molding box, and one end of the piston rod of the hydraulic cylinder is connected to one side of the movable mold.

[0015] The beneficial effects of this utility model are:

[0016] The advantage of this invention is that the polyurethane raw material particles are screened by a crushing device, and the qualified particles are directly fed into the injection molding mechanism. The large particles screened out are crushed into small particles, so that the polyurethane raw material particles can be completely melted, avoiding adverse effects on the quality of the mold and saving energy.

[0017] Secondly, the temperature control components can cool and heat both the fixed and movable molds, facilitating rapid cooling and molding of the injection molded parts, and can also preheat both the fixed and movable molds, improving practical performance. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0019] Figure 2 This is a cross-sectional view of the overall structure of this utility model.

[0020] Figure 3 This is a half-sectional view of the overall structure of the feeding cylinder of this utility model.

[0021] Figure 4 This is a schematic diagram of the crushing roller structure of this utility model.

[0022] Figure 5 This is a schematic diagram of the fixing plate structure of this utility model.

[0023] Figure 6 For the present utility model Figure 2 Enlarged view of point A in the middle.

[0024] Figure 7 For the present utility model Figure 2 Enlarged view of section B in the middle.

[0025] Figures 1-7 Components: 1. Cabinet; 11. Injection Molding Box; 12. Fixed Mold; 13. Movable Mold; 14. Equipment Box; 15. Injection Molding Mechanism; 16. Feeding Cylinder; 2. Material Distribution Plate; 21. Screening Plate; 22. Partition Plate; 23. Guide Plate; 24. Crushing Roller; 25. Shell; 26. Gear; 27. Drive Motor a; 28. Drive Motor b; 29. ​​Stirring Rod; 3. High-Frequency Servo Valve; 31. Cold Water Pipe; 32. Hot Water Pipe; 33. Connector a; 34. Conveying Pipe; 35. Heat Exchanger; 36. Water Pump; 37. Drainage Pipe; 38. Connector b; 4. Fixing Plate; 41. Guide Rod; 42. Hydraulic Cylinder. Detailed Implementation

[0026] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0027] The present application will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0028] Example 1

[0029] like Figures 1-7 As shown, a polyurethane injection molding machine includes: a cabinet 1, an injection box 11 on the top of the cabinet 1, a fixed mold 12 and a movable mold 13 inside the injection box 11, an equipment box 14 on one side of the injection box 11, an injection mechanism 15 on one side of the equipment box 14, a feeding cylinder 16 on the injection mechanism 15, and a discharge pipe at the bottom of the feeding cylinder 16 connected to the interior of the injection mechanism 15; a crushing device inside the feeding cylinder 16 for crushing large raw materials into small particles; and a temperature control component inside the cabinet 1 for regulating the temperature of the fixed mold 12 and the movable mold 13.

[0030] The injection molding box 11 has two fixed plates 4 inside, and the fixed mold 12 is fixedly installed on the fixed plates 4 and the injection molding box 11. Multiple guide rods 41 are fixedly installed between the inner walls of opposite sides of the two fixed plates 4. The movable mold 13 is slidably connected to the outside of the multiple guide rods 41. A hydraulic cylinder 42 is provided on one side of the injection molding box 11, and one end of the piston rod of the hydraulic cylinder 42 is connected to one side of the movable mold 13.

[0031] During injection molding, polyurethane raw material is poured into the feeding cylinder 16. The polyurethane raw material is screened by a crushing device, and large particles are screened out separately and crushed into fine particles to facilitate rapid melting of the polyurethane raw material. The raw material enters the injection molding mechanism 15 and is melted. The injection molding mechanism 15 is controlled by the equipment box 14 to insert one end into the injection port of the fixed mold 12. The injection molding mechanism 15 injects the molten polyurethane raw material into the molding cavity between the fixed mold 12 and the movable mold 13. After injection molding is completed, the injection molding mechanism 15 separates from the fixed mold 12. Then, the temperature control component cools the fixed mold 12 and the movable mold 13 to cool the polyurethane injection molded part quickly. After cooling, the hydraulic cylinder 42 is activated to drive the movable mold 13 to separate from the fixed mold 12. The movable mold 13 moves along the outside of the guide rod 41 to open the door of the injection box 11 and take out the injection molded part. Then, the fixed mold 12 and the movable mold 13 are closed. The temperature control component preheats the fixed mold 12 and the movable mold 13 to facilitate injection molding.

[0032] Example 2

[0033] Based on Embodiment 1, the crushing device includes: a material distribution plate 2, a screening plate 21, a partition plate 22, a guide plate 23, and crushing rollers 24. The material distribution plate 2 is fixedly connected between the inner walls of opposite sides of the feeding cylinder 16. The material distribution plate 2 has two symmetrically arranged screening plates 21, which are arranged in a V-shape. A partition plate 22 is fixedly connected to the bottom end of each screening plate 21. The two screening plates 21 and the two partition plates 22 are respectively connected to the inner wall of the feeding cylinder 16. A guide plate 23 is fixedly connected to one side of each partition plate 22. Two crushing rollers 24 are arranged between the two guide plates 23. The rollers 24 are rotatably connected to the inner wall of the feeding cylinder 16 at opposite ends. A housing 25 is fixedly installed on the outside of the feeding pipe of the feeding cylinder 16. The rotating shafts of the two crushing rollers 24 extend to the housing 25 and are fixedly connected to gears 26. The two gears 26 mesh with each other. A drive motor a27 is fixedly installed on the outside of the housing 25. The drive shaft of the drive motor a27 is connected to the rotating shaft of one of the gears 26. A drive motor b28 is fixedly installed on the top of the feeding cylinder 16. The drive shaft at the bottom of the drive motor b28 extends into the inside of the feeding cylinder 16, and a stirring rod 29 is fixedly installed at the bottom end of the drive shaft of the drive motor b28.

[0034] Polyurethane raw material is fed into the feed inlet at the top of the feeding cylinder 16. The raw material falls onto the distribution plate 2, which diverts it to both sides. The raw material passes through the gaps between the distribution plate 2 and the feeding cylinder 16. After the drive motor b28 starts, it drives the stirring rod 29 to rotate, pushing the raw material into the gaps between the distribution plate 2 and the feeding cylinder 16, causing it to fall onto the screening plate 21. The raw material is then screened through the sieve on the screening plate 21, and polyurethane particles that meet the specified specifications pass through the sieve. The mesh of the screen allows the particles to enter the injection molding mechanism 15 directly through the channel between the partition plate 22 and the feeding cylinder 16. Large particles slide down the inclined surface of the screening plate 21 into the space between the two partition plates 22. The large particles are then gathered onto the two crushing rollers 24 by the two guide plates 23. After the drive motor a27 starts, it drives the connected gear 26 to rotate and mesh with another gear 26. This causes the two gears 26 to drive the two crushing rollers 24 to rotate relative to each other, thereby crushing the large particles into fine particles that are then fed into the injection molding mechanism 15.

[0035] Example 3

[0036] Based on Embodiment 1, the temperature control component includes: a high-frequency servo valve 3, a cold water pipe 31, a hot water pipe 32, a connector a33, a delivery pipe 34, and a heat exchange cylinder 35. The high-frequency servo valve 3 is installed inside the cabinet 1. The top of the high-frequency servo valve 3 is equipped with a cold water pipe 31 and a hot water pipe 32. One end of the cold water pipe 31 and the hot water pipe 32 extends to the outside and is fixedly installed with a connector a33. A delivery pipe 34 is provided on one side of the high-frequency servo valve 3. Both the fixed mold 12 and the movable mold 13 are fitted with heat exchange cylinders 35. One end of the delivery pipe 34 is connected to the two heat exchange cylinders 35 respectively. A water pump 36 is provided on one side of the high-frequency servo valve 3. The input end of the water pump 36 is connected to the high-frequency servo valve 3. A drain pipe 37 is fixedly installed on the output end of the water pump 36. One end of the drain pipe 37 extends to the outside and is fixedly installed with a connector b38.

[0037] The external hot and cold water pipes are connected to connectors a33 of hot water pipe 32 and cold water pipe 31, respectively. When preheating of the fixed mold 12 and the movable mold 13 is required, the high-frequency servo valve 3 is activated to connect the hot water pipe 32 to the delivery pipe 34. Hot water flows through the delivery pipe 34 into the two heat exchange cylinders 35. The heat exchange cylinders 35 are sealed to the fixed mold 12 and the movable mold 13. The hot water heats the fixed mold 12 and the movable mold 13. When cooling the fixed mold 12 and the movable mold 13, the high-frequency servo valve 3 switches the connection between the delivery pipe 34 and the input end of the water pump 36. When the circuit is open, the water pump 36 starts to extract the hot water from the heat exchange cylinder 35 and discharge it through the drain pipe 37. The connector b38 can be connected to an extension pipe to discharge the hot water into a designated container. After the hot water is extracted from the heat exchange cylinder 35, the high-frequency servo valve 3 starts to switch modes to connect the cold water pipe 31 and the delivery pipe 34. The cold water enters the two heat exchange cylinders 35 through the delivery pipe 34 and exchanges heat with the fixed mold 12 and the movable mold 13, so that the fixed mold 12 and the movable mold 13 are cooled down quickly. The injection molded parts inside the fixed mold 12 and the movable mold 13 are cooled and formed quickly. The cold water is discharged according to the above principle of drainage connection.

[0038] All electrical components mentioned in the text are electrically connected to the main controller and power supply. The main controller can be a conventional known device such as a computer that performs control functions, and the existing publicly available power connection technologies are not described in detail in the text.

[0039] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0040] The above provides a detailed description of a polyurethane injection molding machine provided in the embodiments of this application. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the technical solutions and core ideas of this application. Those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A polyurethane injection molding machine characterized by, include: Cabinet (1), the top of the cabinet (1) is provided with an injection molding box (11), the injection molding box (11) is provided with a fixed mold (12) and a movable mold (13) inside, the injection molding box (11) is provided with an equipment box (14) on one side, the equipment box (14) is provided with an injection molding mechanism (15) on one side, the injection molding mechanism (15) is provided with a feeding cylinder (16), and the feeding pipe at the bottom of the feeding cylinder (16) is connected to the inside of the injection molding mechanism (15); The crushing device is located inside the feeding cylinder (16) and is used to crush large raw materials into small particles. The crushing device includes: a material distribution plate (2), a screening plate (21), a partition plate (22), a guide plate (23), and a crushing roller (24). Temperature control component, which is located inside the cabinet (1) and is used to regulate the temperature of the fixed mold (12) and the movable mold (13). The temperature control component includes: high frequency servo valve (3), cold water pipe (31), hot water pipe (32), connector a (33), delivery pipe (34) and heat exchange cylinder (35).

2. The polyurethane injection molding machine of claim 1, wherein, A material distribution plate (2) is fixedly connected between the inner walls of opposite sides of the feeding cylinder (16). The material distribution plate (2) is provided with two symmetrically arranged screening plates (21). The two screening plates (21) are arranged in a V-shape. A partition plate (22) is fixedly connected to the bottom of each of the two screening plates (21). The two screening plates (21) and the two partition plates (22) are respectively connected to the inner wall of the feeding cylinder (16). A guide plate (23) is fixedly connected to the opposite side of each of the two partition plates (22). Two crushing rollers (24) are provided between the two guide plates (23). The two crushing rollers (24) are rotatably connected to the inner wall of the feeding cylinder (16) at opposite ends.

3. The polyurethane injection molding machine according to claim 1, characterized in that, The cabinet (1) is equipped with a high-frequency servo valve (3). The high-frequency servo valve (3) is equipped with a cold water pipe (31) and a hot water pipe (32) on its top. One end of the cold water pipe (31) and the hot water pipe (32) extends to the outside and is fixedly installed with a connector a (33). A conveying pipe (34) is provided on one side of the high-frequency servo valve (3). The fixed mold (12) and the movable mold (13) are both fitted with heat exchange cylinders (35). One end of the conveying pipe (34) is connected to the two heat exchange cylinders (35) respectively.

4. The polyurethane injection molding machine according to claim 1, characterized in that, The feeding cylinder (16) has a housing (25) fixedly installed on its outside. The rotating shafts of the two crushing rollers (24) extend to the housing (25) and are fixedly connected to gears (26). The two gears (26) mesh with each other. A drive motor a (27) is fixedly installed on the outside of the housing (25). The drive shaft of the drive motor a (27) is connected to the rotating shaft of one of the gears (26).

5. The polyurethane injection molding machine according to claim 1, characterized in that, A drive motor b (28) is fixedly installed on the top of the feeding cylinder (16), and the drive shaft at the bottom of the drive motor b (28) extends into the inside of the feeding cylinder (16). A stirring rod (29) is fixedly installed at the bottom end of the drive shaft of the drive motor b (28).

6. The polyurethane injection molding machine according to claim 1, characterized in that, A water pump (36) is provided on one side of the high-frequency servo valve (3). The input end of the water pump (36) is connected to the high-frequency servo valve (3). A drain pipe (37) is fixedly installed at the output end of the water pump (36). One end of the drain pipe (37) extends to the outside and is fixedly installed with a connector b (38).

7. The polyurethane injection molding machine according to claim 1, characterized in that, The injection molding box (11) has two fixed plates (4) fixedly installed inside. The fixed mold (12) is fixedly installed on the fixed plate (4) and the injection molding box (11). Multiple guide rods (41) are fixedly installed between the inner walls of opposite sides of the two fixed plates (4). The movable mold (13) is slidably connected to the outside of the multiple guide rods (41). A hydraulic cylinder (42) is provided on one side of the injection molding box (11). One end of the piston rod of the hydraulic cylinder (42) is connected to one side of the movable mold (13).

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