A die casting device

Abstract

The utility model discloses a kind of die casting devices, belong to foundry technical field, including static mould and movable mould, injection system is provided on movable mould, injection system is used to inject metal liquid into the foundry space synthesized by static mould and movable mould, refrigeration system is provided in static mould, and refrigeration system is used to cool the metal liquid in static mould and movable mould.When movable mould moves to right and is closed with static mould, trigger switch delay trigger, in the time of trigger switch delay, injection system injects metal liquid into the foundry space synthesized by static mould and movable mould, metal liquid injection is finished, trigger switch is closed, electromagnetic stop valve is powered on and opened, refrigeration system works, and the metal liquid in static mould and movable mould is cooled, keeps the time set, movable mould moves to right and is separated from static mould, since movable mould and static mould are separated, trigger switch is opened, electromagnetic stop valve is powered off and closed, and refrigeration system stops working, realize the metal liquid in the foundry space timely cooling to improve the purpose of casting efficiency and quality.

Description

Technical Field

[0001] This utility model belongs to the field of casting technology, and in particular relates to a die-casting device. Background Technology

[0002] A die-casting machine injects molten metal into a mold under pressure, where it cools and solidifies. After the mold is opened, a solid metal casting is obtained. Types include vertical hot chamber die-casting machines and horizontal hot chamber die-casting machines. A die-casting machine mainly consists of a mold clamping mechanism, an injection mechanism, a hydraulic system, and an electrical control system.

[0003] Existing die-casting machines also include a refrigeration system, which is used to cool the molten metal in the mold cavity, enabling the casting to be formed quickly. However, the start and stop of the existing refrigeration system is controlled by a temperature controller, which controls the opening and closing of the electromagnetic shut-off valve to realize the operation and stop of the refrigeration system. However, when the die-casting machine is in use, the mold cavity can only be cooled after it is filled with molten metal. Obviously, the temperature controller cannot meet the needs of the die-casting machine.

[0004] A search revealed patent number CN117139587A, which discloses a die-casting apparatus, including a die-casting table. A lower die-casting mold is located at the center of the upper part of the die-casting table. Columns are fixed at each of the four corners of the upper part of the die-casting table. A top seat is installed on the upper part of each column, and an electric cylinder is installed in the center of the upper part of the top seat. The power end of the electric cylinder passes through the top seat and is fixed to a pressure plate. The upper die-casting mold and the lower die-casting mold are matched. A vertical piston rod drives a hollow piston to move downwards, allowing coolant in the piston cylinder to enter the serpentine flow channel through a connecting channel to pre-cool the upper die-casting mold. Then, molten metal is injected through the injection port under the lower die-casting mold, which facilitates rapid cooling of the molten metal after molding.

[0005] The above solution achieves the cooling function, but the specific technical solution is that during the process of the die-casting upper mold moving downward and the die-casting lower mold closing, the hollow piston rod moves downward at the same time, causing the coolant to enter the serpentine flow channel. The coolant enters the serpentine flow channel in advance, which leads to the lower fluidity of the molten metal during injection due to the lower temperature of the mold cavity. This results in the molten metal not filling completely and tightly, affecting the quality of the product. Utility Model Content

[0006] The purpose of this invention is to provide a die-casting device with high production efficiency and good quality.

[0007] The present invention adopts the following technical solution: a die-casting device, comprising a stationary mold and a moving mold, wherein an injection system is provided on the moving mold, the injection system being used to inject molten metal into the casting space formed by the stationary mold and the moving mold, a refrigeration system is provided in the stationary mold, the refrigeration system being used to cool the molten metal in the stationary mold and the moving mold, an electromagnetic shut-off valve is installed on the refrigeration system, the electromagnetic shut-off valve is normally closed when de-energized, and opens when energized; a trigger switch for the electromagnetic shut-off valve is provided on the stationary mold.

[0008] Furthermore, the refrigeration system includes an evaporator coil, which is disposed within a stationary mold. Both ends of the evaporator coil extend to the left side of the stationary mold. A compressor, a condenser, and an expansion valve are connected in series from left to right between the two ends of the evaporator coil. An electromagnetic shut-off valve is installed between the expansion valve and the evaporator coil.

[0009] Furthermore, a base is fixedly provided on the lower end face of the stationary mold, and the upper end face of the base is slidably disposed with the moving mold in the left-right direction.

[0010] Furthermore, the trigger switch includes two connecting blocks, each fixedly mounted to the stationary mold. The two wires of the electromagnetic shut-off valve are respectively fixedly mounted to the outer side of the corresponding connecting block and electrically connected. Each connecting block has a contact that slides vertically along its outer surface. The connecting block and the contact are electrically connected. Each contact has a first spring on its outer side. The first spring drives the contact to move inward continuously, so that the two contacts are spaced a predetermined distance apart. A trigger rod slides horizontally on the base. A connecting rod is fixedly mounted on the left end of the trigger rod. The height of the connecting rod is less than the height of the trigger rod. The connecting rod is located between the two contacts and does not contact either of the two contacts. A delay mechanism is provided between the trigger rod and the moving mold.

[0011] Furthermore, a base block is fixedly provided on the upper surface of the base, and a pad block is fixedly provided on the upper surface of the base block. The trigger rod is slidably provided on the upper surface of the pad block in the left and right direction.

[0012] Furthermore, the delay mechanism includes a cam mechanism, an energy storage mechanism, and a blocking mechanism.

[0013] Furthermore, the cam mechanism includes a cam rotatably connected to the base block. A gear is coaxially fixed on the front side of the cam. A rack is slidably mounted on the upper surface of the base block in the left-right direction. The rack meshes with the gear. A second spring is fixedly mounted on the left end of the connecting rod. The left end of the second spring is fixedly mounted to the stationary mold. The second spring drives the trigger rod to move to the right, so that the right end of the trigger rod is always in contact with the outer surface of the cam. The cam includes a base circle portion and a protruding portion. The right side of the protruding portion is tangent to the outer circle surface of the base circle portion.

[0014] Furthermore, the energy storage mechanism includes a third spring fixedly mounted to the right end of the rack, a first push plate fixedly mounted to the right end of the third spring, the first push plate slidingly mounted on the base block in the left-right direction, a second push plate fixedly mounted to the front side of the moving mold, an actuating rod fixedly mounted to the lower end face of the second push plate, a vertical part fixedly mounted to the left end of the actuating rod, and a pin plate fixedly mounted between the right end of the rack and the third spring, with the vertical part located to the left of the pin plate.

[0015] Furthermore, the damping mechanism includes a damping strip, a groove is provided on the front side of the base block in the vertical direction, the damping strip is slidably disposed in the groove in the vertical direction, a fourth spring is fixedly disposed at the bottom end of the damping strip, the bottom end of the fourth spring is fixedly disposed with the inner bottom wall of the groove, and a damping inclined surface is provided on the upper end surface of the damping strip.

[0016] Furthermore, an adjustment plate is slidably arranged in the groove along the vertical direction. The upper end face of the adjustment plate is fixedly arranged with the bottom end of the fourth spring. An adjustment hole is opened on the front side of the bottom block located below the groove. An adjustment screw is rotatably connected to the lower end face of the adjustment plate. The bottom end of the adjustment screw extends into the adjustment hole. The adjustment screw is threadedly connected to the bottom block. A drive nut is fixedly arranged at the bottom end of the adjustment screw.

[0017] I. This utility model, by setting up a moving mold, a stationary mold, a refrigeration system, an electromagnetic shut-off valve, an injection system, and a trigger switch, allows for the following operation: When the moving mold moves to the right and closes with the stationary mold, the trigger switch is activated with a delay. During the delay time, the injection system injects molten metal into the casting space formed by the stationary and moving molds. After the molten metal injection is complete, the trigger switch closes, the electromagnetic shut-off valve is energized and opens, and the refrigeration system operates to cool the molten metal in both the stationary and moving molds. After a set time, the moving mold moves to the right and separates from the stationary mold. Due to the separation of the moving and stationary molds, the trigger switch opens, the electromagnetic shut-off valve is de-energized and closes, and the refrigeration system stops operating. This achieves the goal of timely cooling of the molten metal in the casting space, improving casting efficiency and quality.

[0018] II. This utility model, by setting up a connecting block, contacts, a first spring, a trigger rod, a connecting rod, and a delay mechanism, allows the following operation: When the moving mold moves to the left and closes with the stationary mold, the moving mold, through the delay mechanism, pushes the trigger rod to move to the left with a delayed movement, causing the trigger rod to enter between the two contacts and make contact with both contacts, thus achieving the purpose of electrically connecting the two contacts through the trigger rod; after the moving mold and the stationary mold are closed for a set time, the moving mold moves to the right and separates from the stationary mold, and then the casting is removed; when the moving mold and the stationary mold separate, the trigger rod moves to the right until it drives the connecting rod to be located between the two contacts, causing the two contacts to disengage, thus breaking the electrical connection between the two contacts. At this time, the electromagnetic shut-off valve is de-energized and closed, achieving the purpose of disconnecting and connecting the two contacts electrically. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall three-dimensional structure of this utility model; Figure 2 In this utility model Figure 1 Enlarged schematic diagram of the structure at point A in the diagram; Figure 3 In this utility model Figure 1 Enlarged schematic diagram of the structure at point B in the diagram; Figure 4 This is a front view structural diagram of the present utility model; Figure 5 This is a three-dimensional structural diagram of the moving mold and the stationary mold in the separated state of this utility model; Figure 6 This is a schematic diagram of the internal three-dimensional structure of the moving mold in this utility model; Figure 7 This is a schematic diagram of the internal three-dimensional structure of the static mold in this utility model; Figure 8 This is a three-dimensional structural diagram of the compressor in this utility model; Figure 9 This is a three-dimensional structural diagram of the evaporator coil in this utility model; Figure 10 This is a three-dimensional structural diagram of the expansion valve in this utility model; Figure 11 This is a three-dimensional structural diagram of the second pusher plate in this utility model; Figure 12 This is a three-dimensional structural diagram of the electromagnetic shut-off valve in this utility model; Figure 13 This is a three-dimensional structural diagram of the gear in this utility model; Figure 14 In this utility model Figure 13 Enlarged schematic diagram of the structure at point C; Figure 15 This is a three-dimensional structural diagram of the cam in this utility model; Figure 16 This is a front view schematic diagram of the cam structure in this utility model; Figure 17 This is a three-dimensional structural diagram of the connecting block in this utility model.

[0020] In the diagram, 1. Static mold; 2. Moving mold; 3. Electromagnetic shut-off valve; 4. Evaporator coil; 5. Compressor; 6. Condenser; 7. Expansion valve; 8. Base; 9. Connecting block; 10. Wire; 11. Contact; 12. First spring; 13. Trigger rod; 14. Connecting rod; 15. Support plate; 16. Fixing frame; 17. Base block; 18. Pad block; 19. Cam; 20. Gear; 21. Rack; 22. Second spring; 23. Base circle portion; 4. Protruding part; 25. Third spring; 26. First push plate; 27. Second push plate; 28. Actuating rod; 29. ​​Vertical part; 30. Pin plate; 31. Damping strip; 32. Slide groove; 33. Fourth spring; 34. Adjusting plate; 35. Adjusting hole; 36. Adjusting screw; 37. Drive nut; 38. First hydraulic telescopic rod; 39. Injection cylinder; 40. Piston; 41. Piston rod; 42. Second hydraulic telescopic rod; 43. Feed port. Detailed Implementation

[0021] Please see Figure 1-17 The present invention will now be described in detail with reference to the accompanying drawings and embodiments: The die-casting device of this utility model includes a stationary mold 1 and a moving mold 2. An injection system is installed on the moving mold 2 to inject molten metal into the casting space formed by the stationary mold 1 and the moving mold 2. A cooling system is installed inside the stationary mold 1 to cool the molten metal inside the stationary mold 1 and the moving mold 2. An electromagnetic shut-off valve 3 is installed on the cooling system. When the electromagnetic shut-off valve 3 is de-energized, it is normally closed, and the cooling system stops working. When the electromagnetic shut-off valve 3 is energized, it opens, and the cooling system operates to cool the molten metal. A trigger switch for the electromagnetic shut-off valve 3 is installed on the stationary mold 1. When… After the moving mold 2 moves to the right and closes with the stationary mold 1, the trigger switch is delayed, causing the electromagnetic shut-off valve 3 to open with a delay. During the delay time of the trigger switch, the injection system injects molten metal into the casting space formed by the stationary mold 1 and the moving mold 2. After the molten metal is injected, the trigger switch closes, the electromagnetic shut-off valve 3 is energized and opened, and the cooling system works to cool the molten metal in the stationary mold 1 and the moving mold 2. After maintaining the cooling system for a set time, the moving mold 2 moves to the right and separates from the stationary mold 1. As the moving mold 2 separates from the stationary mold 1, the trigger switch opens, the electromagnetic shut-off valve 3 is de-energized and closed, and the cooling system stops working.

[0022] In this embodiment, the refrigeration system includes an evaporator coil 4, which is disposed within the stationary mold 1. Both ends of the evaporator coil 4 extend to the left side of the stationary mold 1. A compressor 5, a condenser 6, and an expansion valve 7 are connected in series from left to right between the two ends of the evaporator coil 4. An electromagnetic shut-off valve 3 is installed between the expansion valve 7 and the evaporator coil 4. During normal operation, the compressor 5 is started and stopped by a pressure relay. When the suction pressure drops to a set value, the compressor 5 stops; when the suction pressure rises to a set value, the compressor 5 starts. Controlling the compressor 5's start and stop using a pressure relay is existing technology. When the moving mold 2 moves to the left and closes with the stationary mold 1, the trigger switch is delayed. During the delay time of the trigger switch, the injection system injects the mixture from the stationary mold 1 and the moving mold 2. Molten metal is injected into the casting space. After the injection is complete, the trigger switch closes, the solenoid shut-off valve 3 is energized and opened, and the refrigerant flows out from the evaporator coil 4 and accumulates at the suction port of the compressor 5. When the suction port pressure rises to the set value, the compressor 5 starts automatically. The refrigerant enters the evaporator coil 4 after being throttled by the expansion valve 7, evaporates and absorbs heat, thereby lowering the ambient temperature and achieving the purpose of cooling. This cools the molten metal in the stationary mold 1 and the moving mold 2. After maintaining this position for a set time, the moving mold 2 moves to the right and separates from the stationary mold 1. As the moving mold 2 separates from the stationary mold 1, the trigger switch opens, the solenoid shut-off valve 3 is de-energized and closed, and the pressure at the suction port decreases as the compressor 5 operates until it drops to the set value, at which point the compressor 5 stops automatically.

[0023] In this embodiment, a base 8 is fixedly provided on the lower end face of the stationary mold 1, and the upper end face of the base 8 is slidably disposed with the moving mold 2 in the left-right direction.

[0024] In this embodiment, the trigger switch includes two connecting blocks 9, both fixedly mounted to the stationary mold 1. Two wires 10 of the electromagnetic shut-off valve 3 are respectively fixedly mounted to the outer sides of the corresponding connecting blocks 9 and electrically connected. Each connecting block 9 has a contact 11 slidably mounted on its outer side in the vertical direction. The connecting block 9 is electrically connected to the contact 11. A first spring 12 is mounted on the outer side of each contact 11, driving the contact 11 to move inwards continuously, thus maintaining a predetermined distance between the two contacts 11. A trigger rod 13 is slidably mounted on the base 8 in the horizontal direction. A connecting rod 14 is fixedly mounted on the left end of the trigger rod 13. The height of the connecting rod 14 is less than the height of the trigger rod 13. The connecting rod 14 is located between the two contacts 11 and does not contact either of them. At this time, the two contacts 11 are disconnected, the electromagnetic shut-off valve 3 is de-energized, the electromagnetic shut-off valve 3 is closed, and the compressor 5 stops. A delay mechanism is provided between the trigger rod 13 and the moving mold 2. When the moving mold 2 moves to the left and closes with the stationary mold 1, the moving mold 2 pushes the trigger rod 13 to move to the left with a delay mechanism (during the delay movement, the injection system injects molten metal into the casting space of the stationary mold 1 and the moving mold 2), so that the trigger rod 13 enters between the two contacts 11 and contacts both contacts 11, achieving the purpose of electrically connecting the two contacts 11 through the trigger rod 13. The electromagnetic shut-off valve 3 is energized and opened, the compressor 5 starts, and the evaporator coil 4 cools, cooling the molten metal in the casting space. After the moving mold 2 and the stationary mold 1 are closed and held for a set time, the moving mold 2 moves to the right and separates from the stationary mold 1, and then the casting is removed. When the moving mold 2 separates from the stationary mold 1, the trigger rod 13 moves to the right until the trigger rod 13 drives the connecting rod 14 to be located between the two contacts 11, so that the two contacts 11 are disengaged, achieving the disconnection of the electrical connection between the two contacts 11. At this time, the electromagnetic shut-off valve 3 is de-energized and closed, and the compressor 5 stops.

[0025] In this embodiment, a support plate 15 is fixedly provided on the right side of the stationary mold 1, and a fixing frame 16 is fixedly provided on the upper end of the support plate 15. Two connecting blocks 9 are fixedly provided in the fixing frame 16. The two connecting blocks 9 are fixedly provided to the stationary mold 1 through the fixing frame 16 and the support plate 15.

[0026] In this embodiment, a base block 17 is fixedly provided on the upper surface of the base 8, and a pad block 18 is fixedly provided on the upper surface of the base block 17. The trigger rod 13 is slidably provided on the upper surface of the pad block 18 in the left and right direction. The trigger rod 13 is slidably provided with the base 8 in the left and right direction through the pad block 18.

[0027] In this embodiment, the delay mechanism includes a cam mechanism, an energy storage mechanism, and a blocking mechanism. When in use, the moving mold 2 moves to the left and closes with the stationary mold 1, which in turn acts on the energy storage mechanism, causing the energy storage mechanism to store energy. The blocking mechanism dampens the energy storage mechanism to release energy, causing the cam mechanism to delay the set time and push the trigger rod 13 to move to the left, thereby causing the two contacts 11 to contact after a delay, and thus causing the compressor 5 to start after a delay. The purpose is to perform cooling after the injection system has finished injecting the molten metal.

[0028] In this embodiment, the cam mechanism includes a cam 19 rotatably connected to the base block 17. A gear 20 is coaxially fixed on the front side of the cam 19. A rack 21 is slidably disposed on the upper end surface of the base block 17 in the left-right direction. The rack 21 meshes with the gear 20. A second spring 22 is fixedly disposed on the left end of the connecting rod 14. The left end of the second spring 22 is fixedly disposed with the stationary mold 1. The second spring 22 drives the trigger rod 13 to move to the right, so that the right end of the trigger rod 13 is always in contact with the outer surface of the cam 19. When the cam 19 rotates one revolution, it can drive the trigger rod 13 to move to the left once.

[0029] In this embodiment, the cam 19 includes a base circle portion 23 and a protrusion portion 24. The right side of the protrusion portion 24 is tangent to the outer circle surface of the base circle portion 23. When the moving mold 2 and the stationary mold 1 close, the energy storage mechanism slowly pushes the rack 21 to the left, thereby driving the gear 20 to rotate clockwise. The gear 20 drives the cam 19 to rotate clockwise. When the right side of the protrusion portion 24 contacts the right end of the trigger rod 13, it pushes the trigger rod 13 to move to the left, causing the trigger rod 13 to drive the connecting rod 14 to move to the left and compress the second spring 22 until the trigger rod 13 enters between the two contacts 11, so that the two contacts 11 are electrically connected through the trigger rod 13. At this time, the right end of the trigger rod 13 is always in contact with the outer circle surface of the protrusion portion 24. The cam 19 continues to rotate. During the period when the right end of the trigger rod 13 is always in contact with the outer circle surface of the protrusion portion 24 (at this time, the compressor 5 starts, and the evaporator coil 4 cools the molten metal in the stationary mold 1 and the moving mold 2), the contact... The trigger rod 13 remains stationary. As the rack 21 continues to move to the left, the cam 19 continues to rotate clockwise until the energy storage mechanism has released all its energy. The right end of the trigger rod 13 remains in contact with the outer surface of the protrusion 24, ensuring the cooling system continues to cool. After cooling is complete, the moving mold 2 moves to the right. After moving a set distance to the right, the moving mold 2 drives the rack 21 to move to the right, which in turn drives the cam 19 to rotate counterclockwise. The right end of the trigger rod 13 slowly falls back from the outer surface of the protrusion 24 to the outer surface of the base circle 23 as the cam 19 rotates counterclockwise. The second spring 22 pushes the connecting rod 14 and the trigger rod 13 to move to the right, causing the trigger rod 13 to disengage from the two contacts 11 and the connecting rod 14 to be positioned between the two contacts 11. At this time, neither of the two contacts 11 is in contact with the connecting rod 14, achieving the purpose of disconnecting the electrical connection between the two contacts 11. The electromagnetic shut-off valve 3 closes, the compressor 5 stops, and cooling is stopped. The cast part can then be removed.

[0030] In this embodiment, the energy storage mechanism includes a third spring 25 fixedly disposed at the right end of the rack 21, a first push plate 26 fixedly disposed at the right end of the third spring 25, the first push plate 26 being slidably disposed on the bottom block 17 in the left and right direction, a second push plate 27 fixedly disposed on the front side of the moving mold 2, an actuating rod 28 fixedly disposed on the lower end surface of the second push plate 27, a vertical part 29 fixedly disposed on the left end of the actuating rod 28, and a pin plate 30 fixedly disposed between the right end of the rack 21 and the third spring 25, with the vertical part 29 located to the left of the pin plate 30.

[0031] In this embodiment, the damping mechanism includes a damping strip 31. A groove 32 is provided on the front side of the bottom block 17 in the vertical direction. The damping strip 31 is slidably disposed in the groove 32 in the vertical direction. A fourth spring 33 is fixedly disposed at the bottom end of the damping strip 31. The bottom end of the fourth spring 33 is fixedly disposed with the inner bottom wall of the groove 32. A damping inclined surface is provided on the upper end surface of the damping strip 31.

[0032] In use, the moving mold 2 moves to the left and closes with the stationary mold 1. After moving a set distance to the left, the moving mold 2 drives the second push plate 27 to contact the first push plate 26 and pushes the first push plate 26 to the left. The first push plate 26 pushes the rack 21 to the left through the third spring 25. When the left end of the rack 21 contacts the damping slope of the damping strip 31, the damping strip 31 prevents the rack 21 from moving to the left. At this time, as the moving mold 2 continues to move to the left, the third spring 25 is compressed to store energy. When the moving mold 2 and the stationary mold 1 close, the third spring 25 has finished storing energy and slowly releases the push plate. The moving rack 21 moves to the left, causing it to overcome the resistance of the damping ramp of the damping strip 31 and push the damping strip 31 downwards. As the damping strip 31 moves downwards, it compresses the fourth spring 33 until the damping strip 31 is fully inside the slide groove 32. At this point, the rack 21 slides to the left, causing the gear 20 to rotate clockwise, which in turn causes the cam 19 to rotate. After the cam 19 rotates to a set angle, the protrusion 24 pushes the trigger rod 13 to move to the left (during this process, the injection system injects molten metal into the casting space of the stationary mold 1 and the moving mold 2), causing the trigger rod 13 to enter the space between the two contacts 11. During this period, the two contacts 11 are electrically connected, the electromagnetic shut-off valve 3 opens, the compressor 5 operates, and cooling begins, cooling the molten metal inside the moving mold 2 and the stationary mold 1; while the second push plate 27 moves to the left, the second push plate 27 also drives the actuating rod 28 and the vertical part 29 to move to the left; when cooling is complete and the mold needs to be opened, the moving mold 2 moves to the right, and at the same time, the second push plate 27 drives the actuating rod 28 and the vertical part 29 to move to the right. After the moving mold 2 has moved a set distance to the right, the vertical part 29 contacts the left side of the pin plate 30, thereby causing the vertical part 29 to drive the rack 21 to the right through the pin plate 30. The movement causes the rack 21 to drive the gear 20 to rotate counterclockwise. As the cam 19 rotates counterclockwise, the right end of the trigger rod 13 slowly falls back from the outer surface of the protrusion 24 to the outer surface of the base circle. The second spring 22 pushes the connecting rod 14 and the trigger rod 13 to move to the right, causing the trigger rod 13 to disengage from the two contacts 11 and the connecting rod 14 to be positioned between the two contacts 11. At this time, neither of the two contacts 11 is in contact with the connecting rod 14, thus achieving the purpose of disconnecting the electrical connection between the two contacts 11. The electromagnetic shut-off valve 3 closes, the compressor 5 stops, and the refrigeration stops. The cast part can then be removed.

[0033] The difference between the sum of the resistance of the damping slope of the damping bar 31 and the elastic force of the fourth spring 33 and the elastic force of the third spring 25 after energy storage determines the time when the rack 21 begins to move to the left when the moving mold 2 and the stationary mold 1 are closed. In order to facilitate the adjustment of this difference in actual use, in this embodiment, an adjusting plate 34 is slidably arranged in the slide groove 32 along the vertical direction. The upper end face of the adjusting plate 34 is fixedly arranged with the bottom end of the fourth spring 33. An adjusting hole 35 is opened on the front side of the bottom block 17 located below the slide groove 32. An adjusting screw 36 is rotatably connected to the lower end face of the adjusting plate 34. The bottom end of the adjusting screw 36 extends into the adjusting hole 35. The adjusting screw 36 is threadedly connected to the bottom block 17. A driving nut 37 is fixedly arranged at the bottom end of the adjusting screw 36. Rotating the drive nut 37 causes the adjusting screw 36 to rotate, which in turn moves the adjusting screw 36 upward, pushing the adjusting plate 34 upward. This causes the adjusting plate 34 to push the fourth spring 33 upward, which in turn moves the damping strip 31 upward, making the top of the damping strip 31 protrude more from the upper surface of the base block 17. At this time, the rack 21 overcomes the resistance of the damping slope of the damping strip 31 and pushes the damping strip 31 downward, so that the damping strip 31 is fully inserted into the slide groove 32. This requires overcoming a greater elastic force of the fourth spring 33 to complete. The delay time for the rack 21 to move to the left will be longer, and the injection system can inject liquid metal into the casting space of the stationary mold 1 and the moving mold 2 with more time. The upper and lower positions of the adjusting plate 34 can be adjusted according to the actual situation.

[0034] In this embodiment, a first hydraulic telescopic rod 38 is fixedly installed on the upper surface of the base 8. The output end of the first hydraulic telescopic rod 38 is fixedly installed with the moving mold 2. The moving mold 2 is pushed to move left and right by the first hydraulic telescopic rod 38 to realize the mold opening and closing.

[0035] In this embodiment, the injection system includes an injection cylinder 39. The left end of the injection cylinder 39 is fixedly connected to the injection hole on the moving mold 2. A piston 40 is slidably disposed inside the injection cylinder 39. A piston rod 41 is fixedly disposed on the right side of the piston 40. A second hydraulic telescopic rod 42 is fixedly disposed on the right side of the moving mold 2. The output end of the second hydraulic telescopic rod 42 is fixedly disposed with the right end of the piston rod 41. A feed port 43 is opened on the injection cylinder 39. The first hydraulic telescopic rod 38 pushes the moving mold 2 to move to the left to close with the stationary mold 1. The second hydraulic telescopic rod 42 and the injection cylinder 39 move with the moving mold 2. Then, a certain amount of molten metal is poured into the feed port 43. Then, the second hydraulic telescopic rod 42 pushes the piston 40 to move to the left through the piston rod 41, so that the piston 40 pushes the molten metal in the injection cylinder 39 into the casting chamber between the moving mold 2 and the stationary mold 1, thus completing the injection of molten metal.

[0036] The working principle of this utility model is as follows: The first hydraulic telescopic rod 38 pushes the moving mold 2 to the left to close with the stationary mold 1, and then pours a certain amount of molten metal into the feed port 43. Then, the second hydraulic telescopic rod 42 pushes the piston rod 41 to push the piston 40 to the left, so that the piston 40 pushes the molten metal in the injection cylinder 39 into the casting chamber between the moving mold 2 and the stationary mold 1, completing the injection of molten metal. At this time, the trigger rod 13 moves to the left under the action of the third spring 25 and enters between the two contacts 11 to realize the electrical connection between the two contacts 11. Then, the electromagnetic shut-off valve 3 opens, the compressor 5 works, and the evaporator coil 4 cools, cooling the molten metal in the stationary mold 1 and the moving mold 2. After the set cooling time, the moving mold 2 moves to the right under the action of the first hydraulic telescopic rod 38. At the same time, the trigger rod 13 moves to the right and drives the connecting rod 14 to enter between the two contacts 11, so that the electrical connection between the two contacts 11 is broken, the cooling stops, and then the casting is taken out.

Claims

1. A die-casting apparatus, comprising a stationary mold (1) and a moving mold (2), characterized in that: An injection system is provided on the moving mold (2). The injection system is used to inject molten metal into the casting space formed by the stationary mold (1) and the moving mold (2). A refrigeration system is provided in the stationary mold (1). The refrigeration system is used to cool the molten metal in the stationary mold (1) and the moving mold (2). An electromagnetic shut-off valve (3) is installed on the refrigeration system. The electromagnetic shut-off valve (3) is normally closed when de-energized and opens when energized. A trigger switch for the electromagnetic shut-off valve (3) is provided on the stationary mold (1).

2. The die-casting apparatus according to claim 1, characterized in that: The refrigeration system includes an evaporator coil (4), which is installed inside the stationary mold (1). Both ends of the evaporator coil (4) extend to the left side of the stationary mold (1). A compressor (5), a condenser (6), and an expansion valve (7) are connected in series from left to right between the two ends of the evaporator coil (4). An electromagnetic shut-off valve (3) is installed between the expansion valve (7) and the evaporator coil (4).

3. The die-casting apparatus according to claim 2, characterized in that: The lower end face of the static mold (1) is fixedly provided with a base (8), and the upper end face of the base (8) is slidably provided with the moving mold (2) in the left and right direction.

4. The die-casting apparatus according to claim 3, characterized in that: The trigger switch includes two connecting blocks (9) that are fixedly set with the stationary mold (1). The two wires (10) of the electromagnetic shut-off valve (3) are fixedly set with the outer side of the corresponding connecting block (9) and electrically connected. Each connecting block (9) has a contact (11) that is slidably set along the up and down direction on its outer side. The connecting block (9) is electrically connected with the contact (11). Each contact (11) has a first spring (12) set on its outer side. The first spring (12) drives the contact (11) to move inward all the time, so that the two contacts (11) are spaced at a set distance. A trigger rod (13) is slidably set on the base (8) along the left and right directions. A connecting rod (14) is fixedly set on the left end of the trigger rod (13). The height of the connecting rod (14) is less than the height of the trigger rod (13). The connecting rod (14) is located between the two contacts (11) and does not contact the two contacts (11). A delay mechanism is set between the trigger rod (13) and the moving mold (2).

5. The die-casting apparatus according to claim 3, characterized in that: The base (8) is fixedly provided with a base block (17) on its upper end surface, and a pad block (18) is fixedly provided on the upper end surface of the base block (17). The trigger rod (13) is slidably provided on the upper end surface of the pad block (18) in the left and right direction.

6. The die-casting apparatus according to claim 4, characterized in that: The delay mechanism includes a cam mechanism, an energy storage mechanism, and a blocking mechanism.

7. The die-casting apparatus according to claim 6, characterized in that: The cam mechanism includes a cam (19) rotatably connected to the base block (17). A gear (20) is coaxially fixed on the front side of the cam (19). A rack (21) is slidably provided on the upper surface of the base block (17) in the left and right directions. The rack (21) meshes with the gear (20). A second spring (22) is fixedly provided on the left end of the connecting rod (14). The left end of the second spring (22) is fixedly provided with the stationary mold (1). The second spring (22) drives the trigger rod (13) to move to the right, so that the right end of the trigger rod (13) is always in contact with the outer surface of the cam (19). The cam (19) includes a base circle portion (23) and a protrusion portion (24). The right side of the protrusion portion (24) is tangent to the outer circle surface of the base circle portion (23).

8. The die-casting apparatus according to claim 7, characterized in that: The energy storage mechanism includes a third spring (25) fixedly disposed at the right end of the rack (21), a first push plate (26) fixedly disposed at the right end of the third spring (25), the first push plate (26) is slidably disposed on the bottom block (17) in the left and right direction, a second push plate (27) is fixedly disposed on the front side of the moving mold (2), an action rod (28) is fixedly disposed on the lower end face of the second push plate (27), a vertical part (29) is fixedly disposed on the left end of the action rod (28), a pin plate (30) is fixedly disposed between the right end of the rack (21) and the third spring (25), and the vertical part (29) is located to the left of the pin plate (30).

9. The die-casting apparatus according to claim 8, characterized in that: The damping mechanism includes a damping strip (31), and a groove (32) is provided on the front side of the bottom block (17) in the vertical direction. The damping strip (31) is slidably disposed in the groove (32) in the vertical direction. A fourth spring (33) is fixedly disposed at the bottom end of the damping strip (31). The bottom end of the fourth spring (33) is fixedly disposed with the inner bottom wall of the groove (32). A damping inclined surface is provided on the upper end surface of the damping strip (31).

10. The die-casting apparatus according to claim 9, characterized in that: An adjusting plate (34) is slidably arranged in the groove (32) along the up and down direction. The upper end of the adjusting plate (34) is fixedly arranged with the bottom end of the fourth spring (33). An adjusting hole (35) is opened on the front side of the bottom block (17) located below the groove (32). An adjusting screw (36) is rotatably connected to the lower end of the adjusting plate (34). The bottom end of the adjusting screw (36) extends into the adjusting hole (35). The adjusting screw (36) is threadedly connected to the bottom block (17). A driving nut (37) is fixedly arranged at the bottom end of the adjusting screw (36).

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