Injection molding machine cooling water circulation system

Abstract

The application belongs to the field of cooling and relates to a cooling water circulation system of an injection molding machine, which comprises a cooling tower, a main cooling water tank, a cooling main water inlet pipe, a cooling main water return pipe, a cooling branch water inlet pipe and a cooling branch water return pipe. The cooling tower and the main cooling water tank are fixed outside an injection molding workshop. The main cooling water tank is connected with the cooling tower. A water inlet section of the cooling main water inlet pipe is connected with a cooling cavity of the main cooling water tank. A water outlet section of the cooling main water inlet pipe extends into the injection molding workshop. A conveying pump is arranged on the cooling main water inlet pipe. The cooling main water inlet pipe is connected with a mold assembly of the injection molding machine through the cooling branch water inlet pipe. A water inlet section of the cooling main water return pipe is located in the injection molding workshop. The mold assembly of the injection molding machine is connected with the water inlet section of the cooling main water return pipe through the cooling branch water return pipe. A water outlet section of the cooling main water return pipe extends out of the injection molding workshop and is connected with a water return cavity of the main cooling water tank. A conveying pump is arranged on the cooling main water return pipe. The application has the advantages of simplified pipeline and less occupied space.

Description

Technical Field

[0001] This application belongs to the field of cooling and relates to a cooling water circulation system for an injection molding machine. Background Technology

[0002] Injection molding machines, also known as injection molding machines or injection molding machines, are the main molding equipment used to produce various shapes of plastic products from thermoplastic or thermosetting plastics using plastic molds. They are available in vertical, horizontal, and all-electric types. Injection molding machines heat the plastic, apply high pressure to the molten plastic, and inject it to fill the mold cavity. The mold inside the machine contains high-temperature liquid during injection. After injection molding, the product needs to be cooled before being removed from the mold to prevent deformation. Patent CN209365302U discloses a cooling device for an injection molding machine mold, including an injection mold with an inlet and an outlet. The inlet and outlet are connected to an inlet pipe and an outlet pipe, respectively. The inlet pipe has a cold water interface and a tap water interface, while the outlet pipe has a cold water interface and a tap water interface. Cold water interfaces 1 and 2 are connected to cold water pipes 1 and 2, respectively, and tap water interfaces 1 and 2 are connected to tap water pipes 1 and 2, respectively. A chiller and a water tank are connected to both the cold water pipes 1 and 2 and the tap water pipes 1 and 2, respectively. The chiller includes a chiller unit with a cooling tower above it and multiple connecting pipes.

[0003] In actual use, a workshop usually has multiple injection molding machines, and each injection molding machine needs to be equipped with a cooling system, which results in complex piping in the workshop and occupies a lot of space. Summary of the Invention

[0004] To simplify the piping layout in the injection molding workshop and reduce the space occupied, this application provides a cooling water circulation system for injection molding machines.

[0005] The technical solution for a cooling water circulation system for an injection molding machine provided in this application is as follows: A cooling water circulation system for an injection molding machine includes a cooling tower, a main cooling water tank, a main cooling water inlet pipe, a main cooling water return pipe, branch cooling water inlet pipes, and branch cooling water return pipes. The cooling tower and the main cooling water tank are both fixed outside the injection molding workshop. The main cooling water tank is connected to the cooling tower via a pipe assembly. The inlet section of the main cooling water inlet pipe is connected to the cooling chamber of the main cooling water tank, and the outlet section of the main cooling water inlet pipe extends into the injection molding workshop. A delivery pump is installed on the main cooling water inlet pipe. Each cooling branch inlet pipe corresponds to one injection molding machine. The main cooling inlet pipe is connected to the mold assembly of the injection molding machine through the cooling branch inlet pipe. The inlet section of the main cooling return pipe is located inside the injection molding workshop. Each cooling branch return pipe corresponds to one injection molding machine. The mold assembly of the injection molding machine is connected to the inlet section of the main cooling return pipe through the cooling branch return pipe. The outlet section of the main cooling return pipe extends outside the injection molding workshop and connects to the return chamber of the main cooling water tank. A delivery pump is installed on the main cooling return pipe.

[0006] By adopting the above technical solution, the cooling water in the cooling chamber of the main cooling water tank flows sequentially through the main cooling water inlet pipe and the cooling branch water inlet pipe to the mold assembly of the injection molding machine. After cooling the mold assembly, it flows sequentially through the cooling branch return water pipe and the main cooling return water pipe back to the return water chamber in the main cooling water tank, thereby cooling the mold assembly of the injection molding machine. Since the main cooling water tank is connected to the cooling tower, the cooling tower can cool the return water of the injection molding machine, ensuring that the temperature of the cooling water delivered from the main cooling water tank to the mold assembly is the predetermined cooling temperature. Since multiple injection molding machines share a main cooling water tank and cooling tower, and both the main cooling water tank and cooling tower are located outside the injection molding workshop, the space occupied in the injection molding workshop can be reduced. At the same time, the mold assemblies of each injection molding machine are connected to the main cooling water inlet pipe through the cooling branch water inlet pipe and to the main cooling return water pipe through the cooling branch return water pipe, which can reduce the piping required in the injection molding workshop and simplify the piping layout.

[0007] Preferably, the cooling water circulation system further includes an auxiliary cooling water tank, an auxiliary cooling water inlet supply main pipe, and auxiliary cooling water inlet branch pipes. The auxiliary cooling water tank is fixed outside the injection molding workshop. The inlet section of the auxiliary cooling water inlet supply main pipe is connected to the auxiliary cooling water tank. The outlet section of the auxiliary cooling water inlet supply main pipe extends into the injection molding workshop. The auxiliary cooling water inlet supply main pipe is equipped with a delivery pump. The auxiliary cooling water inlet branch pipes correspond one-to-one with the injection molding machines. The auxiliary cooling water inlet supply main pipe is connected to the mold assembly of the injection molding machine through the auxiliary cooling water inlet branch pipes.

[0008] By adopting the above technical solution, the cooling water in the auxiliary cooling water tank can flow to the mold assembly in sequence through the auxiliary cooling water inlet main pipe and the auxiliary cooling water inlet branch pipe. After cooling, it flows to the return water chamber in the main cooling water tank in sequence through the cooling branch return water pipe and the cooling main return water pipe. When the main cooling water tank or other components malfunction or have insufficient cooling capacity, the corresponding pipeline of the auxiliary cooling water tank is opened to assist in cooling.

[0009] Preferably, the piping assembly includes Pipe 1, Pipe 2, and Pipe 3. The cooling chamber of the main cooling water tank is connected to the outlet of the cooling tower through Pipe 1, the auxiliary cooling water tank is connected to the outlet of the cooling tower through Pipe 2, and the return water chamber of the main cooling water tank is connected to the inlet of the cooling tower through Pipe 3.

[0010] By adopting the above technical solution, the hot water in the return water chamber of the main cooling water tank flows to the cooling tower through pipe three, and after being cooled, it flows to the cooling chamber of the main cooling water tank and the auxiliary cooling water tank through pipe one and pipe two.

[0011] Preferably, the main cooling water inlet pipe includes a main water supply pipe and a hydraulic distribution box. The hydraulic distribution box includes a first chamber, a second chamber, a third chamber, and a fourth chamber. The first chamber is connected to the second chamber via a connecting hole, and a one-way valve is installed in the connecting hole. The one-way valve allows liquid in the first chamber to flow into the second chamber. The second chamber is connected to the third chamber via a connecting hole, and a one-way valve is installed in the connecting hole. The one-way valve allows liquid in the second chamber to flow into the third chamber. The third chamber is connected to the fourth chamber via a connecting hole, and a one-way valve is installed in the connecting hole. The one-way valve allows liquid in the third chamber to flow into the fourth chamber. One end of the main water supply pipe is connected to the cooling chamber of the main cooling water tank, and the other end of the main water supply pipe is connected to the first cavity. There are two injection molding machines, which are defined as injection molding machine one and injection molding machine two. The first cavity is connected to the mold assembly of injection molding machine one through the cooling branch water inlet pipe. The mold assembly of injection molding machine one is connected to the second cavity through the cooling branch water return pipe. The third cavity is connected to the mold assembly of injection molding machine two through the cooling branch water inlet pipe. The mold assembly of injection molding machine two is connected to the fourth cavity through the cooling branch water return pipe.

[0012] By adopting the above technical solution, the cooling water in the cooling chamber of the main cooling water tank flows through the main water supply pipe to chamber one of the hydraulic distribution box. The water temperature in chamber one is T1. Then, part of the cooling water flows through the cooling branch inlet pipe to the mold assembly of injection molding machine one to cool the mold assembly. Another part of the cooling water flows through check valve one to chamber two of the hydraulic distribution box. The cooling water after cooling the mold assembly of injection molding machine one flows through the cooling branch return pipe to chamber two of the hydraulic distribution box. The water temperature in chamber two is T2, which is higher than T1. The water temperature in chamber two flows through check valve two to chamber three. The cooling water temperature in chamber three is... The temperature is T3, which is close to T2. Part of the water flows through the cooling branch inlet pipe to the mold assembly of injection molding machine two for cooling, and the other part flows through the one-way valve to the cavity four of the hydraulic distribution box. The water that has cooled the mold assembly of injection molding machine two flows through the cooling branch return pipe to the cavity four of the hydraulic distribution box. At this time, the temperature of the cooling water in cavity four, T4, is higher than T3. This system is designed for injection molding machines with different cooling temperatures. Since the required mold cooling temperature is different when molding different products, the water that has been heated after cooling the previous injection molding machine can be mixed with the low-temperature cooling water to obtain a higher temperature cooling water, which is suitable for injection molding machine molds with higher cooling temperatures.

[0013] Preferably, the cooling branch return water pipe includes a main return water pipe, a first return water pipe, and a second return water pipe. One end of the first return water pipe is connected to the second or fourth cavity, and one end of the second return water pipe is connected to the main cooling return water pipe. The other ends of the first and second return water pipes are both connected to one end of the main return water pipe. The other end of the main return water pipe is connected to the mold assembly of the injection molding machine. An electric valve is installed on the first return water pipe, and an electric valve is installed on the second return water pipe.

[0014] By adopting the above technical solution, when the required cooling temperature of the mold components of each injection molding machine is the same, electric valve one is closed and electric valve two is opened, so that the cooling water of the mold components of the injection molding machine flows directly into the main cooling return pipe. When the required cooling temperature of the mold components of each injection molding machine gradually increases, electric valve one is opened and electric valve two is closed, so that the cooling water of the mold components of the injection molding machine flows back into chambers two and four of the hydraulic distribution box, thereby increasing the temperature of the cooling water. The cooling water temperature of the mold components of subsequent injection molding machines gradually increases relative to the cooling water temperature of the mold components of the previous injection molding machine.

[0015] Preferably, a filter screen is rotatably installed inside the water supply main pipe, and the cooling water circulation system further includes a driving device that can drive the filter screen to rotate around the axis of the water supply main pipe. A scraper is also installed inside the water supply main pipe, and the scraper is attached to the side of the filter screen away from the hydraulic distribution box.

[0016] By adopting the above technical solution, after the filter screen is set, impurities in the cooling water can be filtered out, avoiding the accumulation of impurities in the cooling water in the cooling flow path of the mold component, which would affect the cooling effect. The drive device drives the filter screen to rotate, and the scraper can scrape off the impurities on the filter screen, avoiding the filter screen from clogging and affecting the filtration effect.

[0017] Preferably, a dust storage chamber is provided below the main water supply pipe, the opening of the dust storage chamber is connected to the inner cavity of the main water supply pipe, the opening of the dust storage chamber is provided with a cover plate, the end of the cover plate away from the filter screen is hinged to the inner wall of the dust storage chamber, the end of the cover plate near the filter screen can contact the inner wall of the dust storage chamber to form a seal, and the driving device can drive the cover plate to swing.

[0018] By adopting the above technical solution, the drive device can push the cover plate to swing open, so that the dust on the filter screen is scraped into the dust storage chamber. After the dust is scraped off, the drive device can drive the cover plate to swing close, sealing the opening of the dust storage chamber.

[0019] Preferably, the water supply main pipe is rotatably provided with a ball core that can control the on / off state of the water supply main pipe, the driving device can drive the ball core to rotate, and the dust storage chamber is located between the filter screen and the ball core.

[0020] By adopting the above technical solution, the drive device can control the on / off state of the main water supply pipe by driving the ball core to rotate.

[0021] In summary, this application includes at least one of the following beneficial technical effects: 1. Multiple injection molding machines share a main cooling water tank and cooling tower, and both the main cooling water tank and cooling tower are located outside the injection molding workshop, which can reduce the space occupied in the injection molding workshop. At the same time, the mold components of each injection molding machine are connected to the main cooling water inlet pipe through the cooling branch water inlet pipe and to the main cooling water return pipe through the cooling branch water return pipe, which can reduce the piping required in the injection molding workshop and simplify the piping layout. Attached Figure Description

[0022] Figure 1 This is a structural schematic diagram of Embodiment 1 of this application.

[0023] Figure 2 This is a schematic diagram of the structure of Embodiment 2 of this application.

[0024] Figure 3 This is a top view of Embodiment 2 of this application.

[0025] Figure 4 yes Figure 3 A sectional view along line AA.

[0026] Figure 5 yes Figure 3 Sectional view along line BB.

[0027] Figure 6 yes Figure 5 Enlarged view of part A.

[0028] Figure 7 This is a schematic diagram of the internal structure of the water supply main pipe.

[0029] Figure 8 yes Figure 2 Enlarged view of part B.

[0030] Explanation of reference numerals in the attached diagram: 1. Cooling tower; 2. Main cooling water tank; 3. Auxiliary cooling water tank; 4. Pipe 1; 5. Pipe 2; 6. Pipe 3; 7. Injection molding machine; 8. Main cooling water inlet pipe; 9. Main cooling water return pipe; 10. Branch cooling water inlet pipe; 11. Branch cooling water return pipe; 12. Mold assembly; 13. Main auxiliary cooling water inlet pipe; 14. Auxiliary cooling water inlet branch pipe; 15. Injection molding machine 1; 16. Injection molding machine 2; 17. Moving mold; 18. Fixed mold; 19. Main water supply pipe; 20. Hydraulic distribution box; 21. Cavity 1; 22. Cavity 23. Cavity 3; 24. Cavity 4; 25. Check Valve 1; 26. Check Valve 2; 27. Check Valve 3; 28. Main Return Water Pipe; 29. ​​Return Water Pipe 1; 30. Return Water Pipe 2; 31. Filter Screen; 32. Scraper; 33. Dust Storage Chamber; 34. Cover Plate; 35. Ball Core; 36. Drive Device; 37. Rack; 38. Circular Gear 1; 39. Slide Rod; 40. Cam; 41. Bevel Gear 1; 42. Bevel Gear 2; 43. Circular Gear 2; 44. Bevel Gear 3; 45. Bevel Gear 4; 46. Circular Gear 3. Detailed Implementation

[0031] The following is in conjunction with the appendix Figure 1-8 This application will be described in further detail. Example

[0032] like Figure 1 As shown, the cooling water circulation system includes a cooling tower 1, a main cooling water tank 2, and an auxiliary cooling water tank 3. The cooling tower 1, the main cooling water tank 2, and the auxiliary cooling water tank 3 are all fixed outside the injection molding workshop. The cooling tower 1 can be a natural ventilation cooling tower, a mechanical ventilation cooling tower, or a hybrid ventilation cooling tower. The main cooling water tank 2 has a cooling chamber and a return water chamber. The main cooling water tank 2 is connected to the cooling tower 1 through a pipe assembly.

[0033] In this embodiment, the piping assembly includes pipe 4, pipe 5, and pipe 6. The cooling chamber of the main cooling water tank 2 is connected to the outlet of the cooling tower 1 via pipe 4, and the auxiliary cooling water tank 3 is connected to the outlet of the cooling tower 1 via pipe 5. The return water chamber of the main cooling water tank 2 is connected to the inlet of the cooling tower 1 via pipe 6. The hot water in the return water chamber of the main cooling water tank 2 flows to the cooling tower 1 via pipe 6, and after being cooled, flows back to the cooling chamber of the main cooling water tank 2 and the auxiliary cooling water tank 3 via pipes 4 and 5.

[0034] like Figure 1 As shown, the injection molding workshop has multiple injection molding machines 7, preferably three in this embodiment. The cooling water circulation system also includes a main cooling water inlet pipe 8, a main cooling water return pipe 9, a branch cooling water inlet pipe 10, and a branch cooling water return pipe 11. The inlet section of the main cooling water inlet pipe 8 is connected to the cooling chamber of the main cooling water tank 2, and the outlet section of the main cooling water inlet pipe 8 extends into the injection molding workshop. A delivery pump is installed on the main cooling water inlet pipe 8. The branch cooling water inlet pipes 10 correspond one-to-one with the injection molding machines 7. The main cooling water inlet pipe 8 is connected to the mold assembly 12 of the injection molding machine 7 through the branch cooling water inlet pipes 10. Specifically, the branch cooling water inlet pipes 10 are connected to the cooling flow path of the mold assembly 12.

[0035] like Figure 1 As shown, the inlet section of the main cooling return water pipe 9 is located inside the injection molding workshop. The branch cooling return water pipes 11 correspond one-to-one with the injection molding machine 7. The mold assembly 12 of the injection molding machine 7 is connected to the inlet section of the main cooling return water pipe 9 through the branch cooling return water pipes 11. The outlet section of the main cooling return water pipe 9 extends to the outside of the injection molding workshop and connects to the return water chamber of the main cooling water tank 2. A delivery pump is installed on the main cooling return water pipe 9.

[0036] like Figure 1 As shown, the cooling water circulation system also includes an auxiliary cooling water inlet main pipe 13 and an auxiliary cooling water inlet branch pipe 14. The inlet section of the auxiliary cooling water inlet main pipe 13 is connected to the auxiliary cooling water tank 3, and the outlet section of the auxiliary cooling water inlet main pipe 13 extends into the injection molding workshop. The auxiliary cooling water inlet main pipe 13 is equipped with a delivery pump, and the auxiliary cooling water inlet branch pipe 14 corresponds one-to-one with the injection molding machine 7. The auxiliary cooling water inlet main pipe 13 is connected to the mold assembly 12 of the injection molding machine 7 through the auxiliary cooling water inlet branch pipe 14.

[0037] The working principle of this embodiment is as follows: The cooling water in the cooling chamber of the main cooling water tank 2 flows sequentially through the main cooling water inlet pipe 8 and the cooling branch water inlet pipe 10 to the mold assembly 12 of the injection molding machine 7. After cooling the mold assembly 12, it flows sequentially through the cooling branch return water pipe 11 and the main cooling return water pipe 9 to the return water chamber in the main cooling water tank 2, thereby cooling the mold assembly 12 of the injection molding machine 7. The cooling tower 1 can cool the return water of the injection molding machine 7, ensuring that the temperature of the cooling water delivered from the main cooling water tank 2 to the mold assembly 12 is the predetermined cooling temperature. When the main cooling water tank 2 or other components malfunction or the cooling capacity is insufficient, the corresponding pipeline of the auxiliary cooling water tank 3 is opened to assist in cooling. Example

[0038] like Figure 2 , Figure 3As shown, there are two injection molding machines 7, which are defined as injection molding machine one 15 and injection molding machine two 16 respectively. Both injection molding machine one 15 and injection molding machine two 16 are equipped with mold assembly 12 on their processing tables. The mold assembly 12 includes a moving mold 17 and a fixed mold 18. The movement of the moving mold 17 is driven by cylinders, etc.

[0039] like Figure 2 , Figure 4 As shown, the main cooling water inlet pipe 8 includes a main water supply pipe 19 and a hydraulic distribution box 20. The hydraulic distribution box 20 includes a first cavity 21, a second cavity 22, a third cavity 23, and a fourth cavity 24. The first cavity 21 is connected to the second cavity 22 through a connecting hole 1, and a one-way valve 25 is installed in the connecting hole 1, allowing the liquid in the first cavity 21 to flow into the second cavity 22. The second cavity 22 is connected to the third cavity 23 through a connecting hole 2, and a one-way valve 26 is installed in the connecting hole 2, allowing the liquid in the second cavity 22 to flow into the third cavity 23. The third cavity 23 is connected to the fourth cavity 24 through a connecting hole 3, and a one-way valve 27 is installed in the connecting hole 3, allowing the liquid in the third cavity 23 to flow into the fourth cavity 24.

[0040] In this embodiment, check valve 25, check valve 26, and check valve 27 are all spring-loaded, using springs to control the opening and closing of the valve discs. When the liquid flows, the pressure pushes up the spring-controlled valve disc; when the pressure disappears, the spring force pushes the valve disc down, thereby preventing backflow of liquid.

[0041] like Figure 2 , Figure 4 As shown, one end of the main water supply pipe 19 is connected to the cooling chamber of the main cooling water tank 2. The structure of the main cooling water tank 2 can be referred to in Embodiment 1. Figure 1 The other end of the water supply main pipe 19 is connected to cavity 1 21. Cavity 1 21 is connected to the mold assembly 12 of injection molding machine 15 through cooling branch water inlet pipe 10. Mold assembly 12 of injection molding machine 15 is connected to cavity 22 through cooling branch water return pipe 11. Cavity 3 23 is connected to the mold assembly 12 of injection molding machine 26 through cooling branch water inlet pipe 10. Mold assembly 12 of injection molding machine 26 is connected to cavity 4 24 through cooling branch water return pipe 11.

[0042] The cooling branch return water pipe 11 includes a main return water pipe 28, a first return water pipe 29, and a second return water pipe 30. One end of the first return water pipe 29 is connected to the second cavity 22 or the fourth cavity 24. One end of the second return water pipe 30 is connected to the main cooling return water pipe 9. The other ends of the first return water pipe 29 and the second return water pipe 30 are both connected to one end of the main return water pipe 28. The other end of the main return water pipe 28 is connected to the mold assembly 12 of the injection molding machine 7. An electric valve 1 is installed on the first return water pipe 29, and an electric valve 2 is installed on the second return water pipe 30.

[0043] As the required cooling temperature of the mold assembly 12 of each injection molding machine 7 gradually increases, electric valve one is opened and electric valve two is closed. The cooling water in the cooling chamber of the main cooling water tank 2 flows through the water supply main pipe 19 to the cavity 21 of the hydraulic distribution box 20. Then, part of the cooling water flows through the cooling branch inlet pipe 10 to the mold assembly 12 of the injection molding machine 15 to cool the mold assembly 12. The other part of the cooling water flows through the one-way valve 25 to the cavity 22 of the hydraulic distribution box 20 to cool the mold assembly 12 of the injection molding machine 15. Water flows through the cooling branch return water pipe 11 to the second cavity 22 of the hydraulic distribution box 20. The water temperature in the second cavity 22 flows through the second check valve 26 to the third cavity 23. Part of it flows through the cooling branch inlet water pipe 10 to the mold assembly 12 of the injection molding machine 26 for cooling, and the other part flows through the check valve to the fourth cavity 24 of the hydraulic distribution box 20. The water that has cooled the mold assembly 12 of the injection molding machine 26 flows through the cooling branch return water pipe 11 to the fourth cavity 24 of the hydraulic distribution box 20. The fourth cavity 24 can be connected to the main cooling return water pipe 9 through a pipe.

[0044] This mode is designed for injection molding machines 7 with different cooling temperatures. It uses water that has been heated up after the previous injection molding machine 7 has cooled down to mix with the low-temperature cooling water to obtain higher-temperature cooling water, which is suitable for molds of injection molding machines 7 with higher cooling temperatures.

[0045] To better determine the water temperature in chambers 1 (21), 22, 3 (23), and 4 (24), temperature sensors can be installed in each of these chambers and connected to a controller. The controller is then connected to electric valves 1 and 2.

[0046] The auxiliary cooling water inlet main pipe 13 can also be connected to cavity 22 or cavity 3 23 via a pipe to regulate the water temperature in cavity 22 or cavity 3 23.

[0047] like Figure 2 , Figure 5 , Figure 6 As shown, a filter screen 31 is rotatably installed inside the water supply main pipe 19. A scraper 32 is also installed inside the water supply main pipe 19, with the scraper 32 attached to the side of the filter screen 31 facing away from the hydraulic distribution box 20. A dust storage chamber 33 is located below the water supply main pipe 19, with its opening communicating with the inner cavity of the water supply main pipe 19. A cover plate 34 is installed at the opening of the dust storage chamber 33, with the end of the cover plate 34 away from the filter screen 31 hinged to the inner wall of the dust storage chamber 33. The end of the cover plate 34 near the filter screen 31 can contact the inner wall of the dust storage chamber 33 to form a seal. A ball core 35, capable of controlling the on / off state of the water supply main pipe 19, is rotatably installed in the water supply main pipe 19. The dust storage chamber 33 is located between the filter screen 31 and the ball core 35.

[0048] like Figure 2 , Figure 5 , Figure 6 As shown, the cooling water circulation system also includes a drive device 36, which can drive the filter screen 31 to rotate around the axis of the water supply main pipe 19, drive the cover plate 34 to swing, and drive the ball core 35 to rotate.

[0049] like Figure 2 , Figure 6 , Figure 7 , Figure 8 As shown, the drive device 36 includes a rack 37, which is fixed to the moving mold 17 of the mold assembly 12. A ball core 35 is rotatably mounted inside the water supply main pipe 19 via a mounting shaft. The upper end of the mounting shaft extends out of the water supply main pipe 19, and a spur gear 38 is fixed to the upper end of the mounting shaft. The rack 37 can mesh with the spur gear 38. A slide rod 39 is vertically mounted inside the dust storage chamber 33. The upper end of the slide rod 39 abuts against the cover plate 34, lifting the cover plate 34 by movement. The cover plate 34 can be reset by a torsion spring or by its own weight. A cam 40 is also mounted inside the dust storage chamber 33. The cam 40 has a groove along its circumference. The lower end of the slide rod 39 engages with the groove via a ball bearing. Rotation of the cam 40 lifts the slide rod 39. The cam 40 itself is rotatably mounted inside the dust storage chamber 33 via a rotating shaft. One end of the rotating shaft extends outside the dust storage chamber 33 and is connected to a bevel gear 41. A bevel gear 42 is provided on the water supply main pipe 19, meshing with bevel gear 41. Bevel gear 42 is rotatably mounted outside the water supply main pipe 19 via a rotating shaft 2. The water supply main pipe 19 is also provided with a mounting shaft 2 parallel to the mounting shaft 1. The lower end of the mounting shaft 2 is connected to bevel gear 42, and the upper end of the mounting shaft 2 is fixed with a spur gear 43. The spur gear 43 is connected to the rotating shaft 2 via a pulley assembly and can also mesh with the rack 37. A rotating shaft 3 is rotatably mounted inside the water supply main pipe 19 via a bracket. The center of the filter screen 31 is fixed to one end of the rotating shaft 3, and the other end of the rotating shaft 3 is fixed with a bevel gear 44. A bevel gear 45 is also provided inside the water supply main pipe 19, meshing with bevel gear 44. The bevel gear 45 is rotatably mounted on the water supply main pipe 19 via the mounting shaft 3. One end of the mounting shaft 3 extends outside the water supply main pipe 19 and is fixed with a spur gear 46, which can mesh with the rack 37.

[0050] During injection molding, the moving mold 17 and the fixed mold 18 are in the closed state. The rack 37 simultaneously meshes with the first spur gear 38, the second spur gear 43, and the third spur gear 46. The ball core 35 is in the conductive state, and the cooling water passes through normally. During demolding, the moving mold 17 separates and moves relative to the fixed mold 18, causing the rack 37 to move synchronously. The rack 37 simultaneously drives the first spur gear 38, the second spur gear 43, and the third spur gear 46 to rotate. The rotation of the first spur gear 38 drives the filter screen 31 to rotate, which, in conjunction with the scraper 32, scrapes off the impurities on the filter screen 31. The cover plate 34 slowly opens to receive the impurities that fall from the filter screen 31. The rotation of the ball core 35 causes the water in the water supply pipe 19 to be intermittently circulated, forming a water flow with impact to wash away the impurities on the filter screen 31.

[0051] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A cooling water circulation system for an injection molding machine, characterized in that, The system includes a cooling tower (1), a main cooling water tank (2), a main cooling water inlet pipe (8), a main cooling water return pipe (9), a branch cooling water inlet pipe (10), and a branch cooling water return pipe (11). The cooling tower (1) and the main cooling water tank (2) are both fixed outside the injection molding workshop. The main cooling water tank (2) is connected to the cooling tower (1) via a pipe assembly. The inlet section of the main cooling water inlet pipe (8) is connected to the cooling chamber of the main cooling water tank (2). The outlet section of the main cooling water inlet pipe (8) extends into the injection molding workshop. A delivery pump is installed on the main cooling water inlet pipe (8). Each branch cooling water inlet pipe (10) corresponds to one injection molding machine (15). The main cooling water inlet pipe (8) is connected to the injection molding machine (15) via the branch cooling water inlet pipe (10). 7) The mold assembly (12) is connected. The inlet section of the main cooling return water pipe (9) is located in the injection molding workshop. The cooling branch return water pipe (11) corresponds to the injection molding machine (15). The mold assembly (12) of the injection molding machine (7) is connected to the inlet section of the main cooling return water pipe (9) through the cooling branch return water pipe (11). The outlet section of the main cooling return water pipe (9) extends to the outside of the injection molding workshop and connects to the return water chamber of the main cooling water tank (2). A delivery pump is installed on the main cooling return water pipe (9). The main cooling inlet water pipe (8) includes a main water supply pipe (19) and a hydraulic distribution box (20). The hydraulic distribution box (20) includes a cavity one (21), a cavity two (22), a cavity three (23), and a cavity four (24). The first cavity (21) is connected to the second cavity (22) through a connecting hole 1, and a one-way valve 1 (25) is provided in the connecting hole 1. The one-way valve 1 (25) allows the liquid in the first cavity (21) to flow into the second cavity (22). The second cavity (22) is connected to the third cavity (23) through a connecting hole 2, and a one-way valve 2 (26) is provided in the connecting hole 2. The one-way valve 2 (26) allows the liquid in the second cavity (22) to flow into the third cavity (23). The third cavity (23) is connected to the fourth cavity (24) through a connecting hole 3, and a one-way valve 3 (27) is provided in the connecting hole 3. The one-way valve 3 (27) allows the liquid in the third cavity (23) to flow into the fourth cavity (24). One end of the main water supply pipe (19) is connected to the... The cooling chamber of the main cooling water tank (2) is connected, and the other end of the main water supply pipe (19) is connected to the cavity (21). A filter screen (31) is rotatably installed inside the main water supply pipe (19). The cooling water circulation system also includes a drive device (36). The drive device (36) can drive the filter screen (31) to rotate around the axis of the main water supply pipe (19). A scraper (32) is also installed inside the main water supply pipe (19). The scraper (32) is attached to the side of the filter screen (31) away from the hydraulic distribution box (20). The drive device (36) includes a rack (37). During injection molding, the moving mold (17) and the fixed mold (18) are in the mold closing state, the rack (37) is in the meshing state, the ball core (35) is in the conducting state, and the cooling water passes through normally.During demolding, the moving mold (17) separates and moves relative to the fixed mold (18), causing the rack (37) to move synchronously, driving the filter screen (31) to rotate, and cooperating with the scraper (32) to scrape off the impurities on the filter screen (31).

2. The injection molding machine cooling water circulation system according to claim 1, characterized in that, The cooling water circulation system also includes an auxiliary cooling water tank (3), an auxiliary cooling water inlet supply main pipe (13), and an auxiliary cooling water inlet branch pipe (14). The auxiliary cooling water tank (3) is fixed outside the injection molding workshop. The inlet section of the auxiliary cooling water inlet supply main pipe (13) is connected to the auxiliary cooling water tank (3). The outlet section of the auxiliary cooling water inlet supply main pipe (13) extends into the injection molding workshop. The auxiliary cooling water inlet supply main pipe (13) is equipped with a delivery pump. The auxiliary cooling water inlet branch pipe (14) corresponds one-to-one with the injection molding machine (7). The auxiliary cooling water inlet supply main pipe (13) is connected to the mold assembly (12) of the injection molding machine (7) through the auxiliary cooling water inlet branch pipe (14).

3. The injection molding machine cooling water circulation system according to claim 1, characterized in that, The pipeline assembly includes a first pipe (4), a second pipe (5), and a third pipe (6). The cooling chamber of the main cooling water tank (2) is connected to the outlet of the cooling tower (1) through the first pipe (4). The auxiliary cooling water tank (3) is connected to the outlet of the cooling tower (1) through the second pipe (5). The return water chamber of the main cooling water tank (2) is connected to the inlet of the cooling tower (1) through the third pipe (6).

4. The injection molding machine cooling water circulation system according to claim 2, characterized in that, There are two injection molding machines (7), which are respectively defined as injection molding machine one (15) and injection molding machine two (16). Cavity one (21) is connected to the mold assembly (12) of injection molding machine one (15) through cooling branch water inlet pipe (10). The mold assembly (12) of injection molding machine one (15) is connected to cavity two (22) through cooling branch water return pipe (11). Cavity three (23) is connected to the mold assembly (12) of injection molding machine two (16) through cooling branch water inlet pipe (10). The mold assembly (12) of injection molding machine two (16) is connected to cavity four (24) through cooling branch water return pipe (11).

5. The injection molding machine cooling water circulation system according to claim 4, characterized in that, The cooling branch return water pipe (11) includes a return water main pipe (28), a return water branch pipe one (29) and a return water branch pipe two (30). One end of the return water branch pipe one (29) is connected to the cavity two (22) or the cavity four (24). One end of the return water branch pipe two (30) is connected to the cooling main return water pipe (9). The other ends of the return water branch pipe one (29) and the other ends of the return water branch pipe two (30) are both connected to one end of the return water main pipe (28). The other end of the return water main pipe (28) is connected to the mold assembly (12) of the injection molding machine (7). An electric valve one is provided on the return water branch pipe one (29), and an electric valve two is provided on the return water branch pipe two (30).

6. The injection molding machine cooling water circulation system according to claim 5, characterized in that, A dust storage chamber (33) is provided below the water supply main pipe (19). The opening of the dust storage chamber (33) is connected to the inner cavity of the water supply main pipe (19). A cover plate (34) is provided at the opening of the dust storage chamber (33). The end of the cover plate (34) away from the filter screen (31) is hinged to the inner wall of the dust storage chamber (33). The end of the cover plate (34) near the filter screen (31) can contact the inner wall of the dust storage chamber (33) to form a seal. The driving device (36) can drive the cover plate (34) to swing.

7. The injection molding machine cooling water circulation system according to claim 6, characterized in that, The water supply main pipe (19) is rotatably equipped with a ball core (35) that can control the on / off state of the water supply main pipe (19). The driving device (36) can drive the ball core (35) to rotate. The dust storage chamber (33) is located between the filter screen (31) and the ball core (35).

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