Injection molding device for washing machine shell production

Abstract

The invention discloses an injection molding device for washing machine shell production, and relates to the technical field of washing machine shell injection molding, the injection molding device comprises a U-shaped frame and an upper mold, the bottom of the upper mold is connected with a mold base, the bottom of the inner wall of the U-shaped frame is connected with a lower mold, the lower mold is internally provided with a rectangular groove, and the back of the U-shaped frame is connected with a transverse plate; a conveying mechanism is arranged at the top of the transverse plate, a first temperature control mechanism is arranged in the rectangular groove, a second temperature control mechanism is arranged in the mold base, and through the arranged conveying mechanism, the first temperature control mechanism and the second temperature control mechanism, a worker can synchronously cool the lower mold and the mold base; and therefore, the shell in the injection molding cavity of the mold is synchronously cooled from inside to outside and from outside to inside, the shell cooling efficiency can be greatly improved through a two-way channel cooling mode, and the shell production efficiency is further improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of washing machine shell, in particular to a injection molding device for washing machine shell production. BACKGROUND

[0002] The washing machine is a cleaning appliance that uses electric energy to produce mechanical action to wash clothes, and is divided into household and collective types according to the rated washing capacity. The shell of the washing machine is produced by injection molding.

[0003] When the washing machine shell is injection molded by the mold, in order to improve the cooling forming speed of the shell in the mold cavity, a one-piece cooling cavity is usually arranged in the lower mold, and cold water flows continuously in the cooling cavity, so as to realize the cooling of the whole lower mold. This way can only cool from the outside to the inside, which makes the cooling efficiency of the shell low, and the cooling speed of the inner and outer walls of the shell is not uniform in a single direction, which affects the quality of product forming. At the same time, after cooling, the mold cavity will have a low temperature, and when the next injection operation is performed, the molten injection material injected into the cavity will quickly contact the low-temperature cavity wall, which is prone to premature solidification, thereby affecting the next injection. Therefore, we propose a injection molding device for washing machine shell production. SUMMARY

[0004] The purpose of the present application is to solve the problems existing in the prior art, and to provide a injection molding device for washing machine shell production. The advantages of the present application are that the two-way channel cooling method can greatly improve the cooling efficiency of the shell, thereby further improving the production efficiency of the shell.

[0005] In order to achieve the above purpose, the present application adopts the following technical scheme: A injection molding device for washing machine shell production, comprising a U-shaped frame and an upper mold, the bottom of the upper mold is connected with a mold seat, the bottom of the inner wall of the U-shaped frame is connected with a lower mold, a rectangular groove is arranged in the lower mold, the back of the U-shaped frame is connected with a horizontal plate, the top of the horizontal plate is provided with a conveying mechanism, the inside of the rectangular groove is provided with a first temperature control mechanism, the inside of the mold seat is provided with a second temperature control mechanism, and the first temperature control mechanism and the second temperature control mechanism respectively penetrate the lower mold and the upper mold and extend to the back of the U-shaped frame and are connected with the conveying mechanism, the top of the horizontal plate is provided with a heating mechanism, and the heating mechanism is connected with the conveying mechanism, a blocking mechanism is arranged at the connection between the conveying mechanism and the heating mechanism, a locking mechanism is arranged on the conveying mechanism, and the locking mechanism is connected with the blocking mechanism.

[0006] Through the above technical scheme: the water can be cooled by the conveying mechanism, and the water can be conveyed to the first temperature control mechanism and the second temperature control mechanism by starting the conveying mechanism, at this time, the upper die and the lower die in the closed die state can be cooled from the outside to the inside and from the inside to the outside by the first temperature control mechanism and the second temperature control mechanism, so that the cooling efficiency of the shell is improved, the locking mechanism can release the locking of the blocking mechanism, and the water inlet end of the conveying mechanism can be blocked and the water inlet end of the heating mechanism can be opened by rotating the blocking mechanism, and the blocking mechanism can be locked by the locking mechanism after adjustment, then the water in the conveying mechanism is drained to the inside of the heating mechanism, and the cold water is preheated by the heating mechanism and then divided into the first temperature control mechanism and the second temperature control mechanism by the conveying mechanism, at this time, the first temperature control mechanism and the second temperature control mechanism can heat the die seat and the lower die to avoid the overcooling of the lower die to cause the premature solidification of the raw material.

[0007] The application further provides that the conveying mechanism comprises a cooling box, a first centrifugal pump, a refrigeration sheet and a T-shaped water pipe, the cooling box is connected to the top of the horizontal plate, the first centrifugal pump is connected to the top of the cooling box, and the input end of the first centrifugal pump extends to the inside of the cooling box, the refrigeration sheet is fixedly connected to the back of the cooling box and extends to the inside of the cooling box, and the T-shaped water pipe is connected to the output end of the first centrifugal pump. Through the above technical scheme: the water in the cooling box is cooled by the refrigeration sheet, and the cold water in the cooling box is divided into the first temperature control mechanism and the second temperature control mechanism by starting the first centrifugal pump, so that the first temperature control mechanism and the second temperature control mechanism can cool the lower die and the die seat respectively, and then realize the bidirectional cooling of the shell in the die cavity.

[0008] The application further provides that the first temperature control mechanism comprises a first annular water pipe, a backwater pipe and a water inlet pipe, the first annular water pipe is wound on the inner wall of the rectangular groove, the backwater pipe is connected to the lower part of the outer surface of the first annular water pipe, one end of the backwater pipe penetrates the lower die and the U-shaped frame and is connected to the front surface of the cooling box, and the water inlet pipe is connected to one end of the T-shaped water pipe and extends to the inside of the rectangular groove and is connected to the upper part of the outer surface of the first annular water pipe.

[0009] Through the above technical scheme: the cold water is conveyed to the inside of the first annular water pipe by the conveying mechanism, the water in the first annular water pipe contacts the inner wall of the rectangular groove, so that the lower die is cooled, the shell in the die cavity is cooled or heated from the outside to the inside, and finally the cold and hot water is returned to the inside of the cooling box through the backwater pipe for recycling.

[0010] The second temperature control mechanism comprises a second annular water pipe, a fixed pipe, a first hose and a second hose, the second annular water pipe is attached to the inner wall of the mold base, the fixed pipe is connected to the upper part of the outer surface of the second annular water pipe, and the fixed pipe penetrates the upper mold and extends to the outside of the upper mold, the first hose is connected to the other end of the T-shaped water pipe, and one end of the first hose is connected to one end of the fixed pipe, the second hose is connected to the lower part of the outer surface of the second annular water pipe, and one end of the second hose penetrates the upper mold and is connected to the top of the cooling box.

[0011] Through the above technical scheme: the conveying mechanism conveys cold water to the inside of the second annular water pipe through the first hose and the fixed pipe, and the cold water contacts the inner wall of the mold base to cool it, so that the shell can be cooled from the inside out or preheated, and finally the water flows into the conveying mechanism through the second hose to be recycled.

[0012] The heating mechanism comprises a heat preservation box, a plurality of heating rods, a drain valve, a second centrifugal pump and a connecting pipe, the heat preservation box is connected to the top of the horizontal plate, the plurality of heating rods are connected to one side of the heat preservation box, and one end of the plurality of heating rods extends to the inside of the heat preservation box, the drain valve is connected between the heat preservation box and the cooling box, the second centrifugal pump is connected to the top of the heat preservation box, and the input end of the second centrifugal pump extends to the inside of the heat preservation box, and the connecting pipe is connected to the output end of the second centrifugal pump, and one end of the connecting pipe is connected to the outer surface of the T-shaped water pipe.

[0013] Through the above technical scheme: after the plurality of heating rods heat the water in the heat preservation box, the second centrifugal pump can be started to convey the water in the heating rods to the inside of the T-shaped water pipe through the connecting pipe, and then the hot water can be distributed to the first temperature control mechanism and the second temperature control mechanism to preheat the mold base and the lower mold, and the drain valve can guide the cold water in the cooling box to the inside of the heat preservation box for heating treatment.

[0014] The blocking mechanism comprises two rotating rods, a circular plug plate and a conical gear, the two rotating rods are respectively rotatably connected to the inner surfaces of the connecting pipe and the T-shaped water pipe, and one end of each of the two rotating rods extends to the outside of the connecting pipe and the T-shaped water pipe, two grooves are formed in the outer surface of one of the rotating rods, the two circular plug plates are fixedly connected to the outer surfaces of the two rotating rods, and the two conical gears are connected to one end of each of the two rotating rods and meshed with each other.

[0015] Through the above technical solution: when one of the rotating rods rotates, it can drive one of the circular plug plates and one of the bevel gears to rotate. One of the bevel gears drives another bevel gear to drive another rotating rod to rotate, causing the other circular plug plate to rotate 90 degrees, no longer sealing the inside of the connecting pipe. When one of the circular plug plates rotates 90 degrees, it will seal the inside of the T-shaped water pipe. At this time, the heating mechanism can deliver hot water to the first temperature control mechanism and the second temperature control mechanism. Therefore, when it is necessary to switch between sealing and opening the inside of the T-shaped water pipe and the connecting pipe, it is only necessary to rotate the two circular plug plates 90 degrees each time.

[0016] The invention is further configured such that the locking mechanism includes a fixed plate, a throttle, iron rods, and positioning holes. The fixed plate is fixedly connected to the outer surface of the T-shaped water pipe. The throttle is slidably connected between two sliding grooves and sleeved on the outside of one of the throttle rods. The four iron rods are equidistantly connected to the front of the throttle. The four positioning holes are equidistantly opened on the back of the fixed plate, and each of the four positioning holes is connected to a magnet. One end of each of the four iron rods is movably inserted into the four positioning holes and attracted to the four magnets.

[0017] Through the above technical solution: pulling the throttle forcefully allows it to slide inside the two grooves, causing the four iron rods to retract from the four positioning holes and separate from the four magnets, thereby releasing the lock on the rotation of one of the rods. At this time, the throttle can drive one of the rods to rotate. Pushing the throttle in the opposite direction allows the four iron rods to re-insert into the four positioning holes, thus re-locking the rotation of one of the rods.

[0018] The invention is further configured such that a cylinder is connected to the top of the U-shaped frame, and the output end of the cylinder extends to the inner side of the U-shaped frame and is connected to the top of the upper mold; multiple bases are connected to the bottom of the U-shaped frame and the bottom of the horizontal plate.

[0019] Through the above technical solutions: the output end of the starting cylinder can drive the upper mold to descend and close with the lower mold, so that the mold base and the mold core inside the lower mold can cooperate to form a pre-injection molded part cavity. Multiple bases can provide stable support for the U-shaped frame and the horizontal plate, thereby improving the stability of the device during operation and reducing shaking.

[0020] The beneficial effects of this invention are as follows: An injection molding apparatus for producing washing machine casings allows workers to simultaneously cool the lower mold and mold base through a conveying mechanism, a first temperature control mechanism, and a second temperature control mechanism. This enables simultaneous cooling of the casing inside the mold injection cavity from the inside out and from the outside in, thus significantly improving the cooling efficiency of the casing and further enhancing the production efficiency of the casing.

[0021] An injection molding device for producing washing machine casings allows operators to easily seal the water inlet of a T-shaped water pipe and open the interior of the connecting pipe through a heating mechanism, a blocking mechanism, and a locking mechanism. This enables switching between hot and cold water. Hot water is then supplied to a first temperature control mechanism and a second temperature control mechanism for rapid dual-channel preheating of the cooled mold cavity. This prevents the raw material from being affected by the previous mold cooling during the next injection, thus avoiding premature solidification. The device forms a complete closed-loop optimization for injection molding, ensuring both effective cooling and shaping, and smooth operation of subsequent injection molding processes. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of an injection molding device for producing washing machine shells according to the present invention; Figure 2 This is a schematic diagram of the back of an injection molding device for producing washing machine casings, as proposed in this invention. Figure 3 for Figure 2 Enlarged view of point A; Figure 4 This is a schematic diagram of the internal structure of this mold base.

[0023] Figure 5 This is a schematic diagram of the conveying mechanism and two temperature control mechanisms of an injection molding device for producing washing machine shells, as proposed in this invention.

[0024] Figure 6 This is a schematic diagram of the heating mechanism of an injection molding device for producing washing machine shells, as proposed in this invention.

[0025] Figure 7 This is a schematic diagram of the blocking mechanism of an injection molding device for producing washing machine shells, as proposed in this invention. Figure 8 This is a schematic diagram of the locking mechanism of an injection molding device for producing washing machine casings, as proposed in this invention.

[0026] In the diagram: 1. U-shaped frame; 2. Upper mold; 3. Mold base; 4. Lower mold; 5. Conveying mechanism; 501. Cooling box; 502. First centrifugal pump; 503. Refrigeration element; 504. T-shaped water pipe; 6. First temperature control mechanism; 601. First annular water pipe; 602. Return water pipe; 603. Inlet water pipe; 7. Second temperature control mechanism; 701. Second annular water pipe; 702. Fixed pipe; 703. First flexible hose; 704. Second flexible hose; 8. Heating mechanism; 801. Insulation box; 802. Heating rod; 803. Drain valve; 804. Second centrifugal pump; 805. Connecting pipe; 9. Blocking mechanism; 901. Rotating rod; 902. Circular stopper plate; 903. Bevel gear; 10. Locking mechanism; 1001. Fixed plate; 1002. Rotary handle; 1003. Iron rod; 1004. Positioning hole. Detailed Implementation

[0027] The technical solution of this patent will be further described in detail below with reference to specific embodiments.

[0028] The embodiments of this patent are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this patent, and should not be construed as limiting this patent.

[0029] Reference Figures 1 to 8An injection molding apparatus for producing washing machine casings includes a U-shaped frame 1 and an upper mold 2. A mold base 3 is connected to the bottom of the upper mold 2. A lower mold 4 is connected to the bottom of the inner wall of the U-shaped frame 1. A rectangular groove is formed inside the lower mold 4. A horizontal plate is connected to the back of the U-shaped frame 1. A conveying mechanism 5 is provided at the top of the horizontal plate. A first temperature control mechanism 6 is provided inside the rectangular groove. A second temperature control mechanism 7 is provided inside the mold base 3. The first and second temperature control mechanisms 6 and 7 respectively penetrate the lower mold 4 and the upper mold 2 and extend to the back of the U-shaped frame 1, connecting to the conveying mechanism 5. A heating mechanism 8 is provided at the top of the horizontal plate and is connected to the conveying mechanism 5. A blocking mechanism 9 is provided at the connection between the conveying mechanism 5 and the heating mechanism 8. A locking mechanism 10 is provided on the conveying mechanism 5 and is connected to the blocking mechanism 9. Water is first added to the conveying mechanism 5, which cools the water. Then, the conveyor is started. Mechanism 5 can deliver water to the first temperature control mechanism 6 and the second temperature control mechanism 7 respectively. At this time, the upper mold 2 and the lower mold 4, which are in the mold closing state, can cool the outer shell inside the mold cavity from the outside to the inside and from the inside to the outside under the action of the first temperature control mechanism 6 and the second temperature control mechanism 7, thereby improving the cooling efficiency of the outer shell. The locking mechanism 10 first releases the lock on the blocking mechanism 9. At this time, rotating the blocking mechanism 9 can block the output end of the conveying mechanism 5 and open the water inlet end of the heating mechanism 8 respectively. After the adjustment is completed, the locking mechanism 10 can lock the blocking mechanism 9. Then, the water inside the conveying mechanism 5 is diverted to the inside of the heating mechanism 8. After the heating mechanism 8 preheats the cold water, it is diverted to the first temperature control mechanism 6 and the second temperature control mechanism 7 through the conveying mechanism 5. At this time, the first temperature control mechanism 6 and the second temperature control mechanism 7 can heat the mold base 3 and the lower mold 4 to prevent the lower mold 4 from being too cold and causing the raw material to solidify prematurely.

[0030] Specifically, the conveying mechanism 5 includes a cooling box 501, a first centrifugal pump 502, a cooling plate 503, and a T-shaped water pipe 504. The cooling box 501 is connected to the top of the horizontal plate, the first centrifugal pump 502 is connected to the top of the cooling box 501, and the input end of the first centrifugal pump 502 extends into the interior of the cooling box 501. The cooling plate 503 is fixedly connected to the back of the cooling box 501, and the cooling plate 503 extends into the interior of the cooling box 501. The T-shaped water pipe 504 is connected to the output end of the first centrifugal pump 502. After the water inside the cooling box 501 is cooled by the cooling plate 503, starting the first centrifugal pump 502 can divert the cold water inside the cooling box 501 to the first temperature control mechanism 6 and the second temperature control mechanism 7 through the T-shaped water pipe 504, thereby allowing the first temperature control mechanism 6 and the second temperature control mechanism 7 to cool the lower mold 4 and the mold base 3 respectively.

[0031] Specifically, the first temperature control mechanism 6 includes a first annular water pipe 601, a return water pipe 602, and an inlet water pipe 603. The first annular water pipe 601 is wound around the inner wall of the rectangular groove. The return water pipe 602 is connected to the lower part of the outer surface of the first annular water pipe 601, and one end of the return water pipe 602 passes through the lower mold 4 and the U-shaped frame 1 and is connected to the front of the cooling box 501. The inlet water pipe 603 is connected to one end of the T-shaped water pipe 504, and one end of the inlet water pipe 603 extends into the interior of the rectangular groove and is connected to the upper part of the outer surface of the first annular water pipe 601. The conveying mechanism 5 can transport hot and cold water to the interior of the first annular water pipe 601 through the inlet water pipe 603. The water inside the first annular water pipe 601 contacts the inner wall of the rectangular groove, thereby cooling or preheating the lower mold 4, thus achieving cooling or heating of the outer shell inside the mold cavity from the outside to the inside. Finally, the hot and cold water is returned to the interior of the cooling box 501 through the return water pipe 602 for recycling.

[0032] Specifically, the second temperature control mechanism 7 includes a second annular water pipe 701, a fixed pipe 702, a first flexible hose 703, and a second flexible hose 704. The second annular water pipe 701 is attached to the inner wall of the mold base 3. The fixed pipe 702 is connected to the upper part of the outer surface of the second annular water pipe 701, and the fixed pipe 702 passes through the upper mold 2 and extends to the outside of the upper mold 2. The first flexible hose 703 is connected to the other end of the T-shaped water pipe 504, and one end of the first flexible hose 703 is connected to one end of the fixed pipe 702. The second flexible hose 704 is connected to the lower part of the outer surface of the second annular water pipe 701, and one end of the second flexible hose 704 passes through the upper mold 2 and is connected to the cooling system. The top of the box 501 is connected to the conveying mechanism 5, which delivers cold or hot water through the first hose 703 and the fixed pipe 702 to the inside of the second annular water pipe 701. The hot or cold water comes into contact with the inner wall of the mold base 3, thereby preheating or cooling it. Therefore, the outer shell can be cooled or preheated from the inside out. Finally, the water flows into the conveying mechanism 5 through the second hose 704 for recycling. It should be noted that because the first hose 703 and the second hose 704 are made of soft material and have a certain length allowance, the water delivery will not be affected when the cylinder output end drives the mold base 3 to descend through the upper mold 2.

[0033] Specifically, the heating mechanism 8 includes an insulation box 801, multiple heating rods 802, a drain valve 803, a second centrifugal pump 804, and a connecting pipe 805. The insulation box 801 is connected to the top of the horizontal plate. The multiple heating rods 802 are all connected to one side of the insulation box 801, and one end of each heating rod 802 extends into the interior of the insulation box 801. The drain valve 803 is connected between the insulation box 801 and the cooling box 501. The second centrifugal pump 804 is connected to the top of the insulation box 801, and its input end extends into the interior of the insulation box 801. The connecting pipe 805 connects to the second centrifugal pump 804. The output end of pump 804 is connected, and one end of connecting pipe 805 is connected to the outer surface of T-shaped water pipe 504. Under the action of multiple heating rods 802, the water inside the heat preservation box 801 can be heated. Then, the water inside the heating rods 802 can be transported to the inside of T-shaped water pipe 504 through connecting pipe 805 by the second centrifugal pump 804. Then, the hot water can be distributed to the first temperature control mechanism 6 and the second temperature control mechanism 7, thereby realizing the preheating of mold base 3 and lower mold 4. The cold water inside the cooling box 501 can be diverted to the inside of the heat preservation box 801 for heating treatment through drain valve 803.

[0034] Specifically, the blocking mechanism 9 includes two rotating rods 901, a circular stopper plate 902, and a bevel gear 903. The two rotating rods 901 are rotatably connected to the inner surfaces of the connecting pipe 805 and the T-shaped water pipe 504, respectively, and one end of each rotating rod 901 extends to the outside of the connecting pipe 805 and the T-shaped water pipe 504. Two grooves are formed on the outer surface of one of the rotating rods 901. The two circular stoppers 902 are fixedly connected to the outer surfaces of the two rotating rods 901, respectively. The two bevel gears 903 are connected to one end of each of the two rotating rods 901, and the two bevel gears 903 mesh. The rotation of one of the rotating rods 901 can drive one of the circular stoppers 902 and one of the bevel gears 903. Gear 903 rotates, and one bevel gear 903 can drive another bevel gear 903 to drive another rotating rod 901 to rotate, causing another circular stopper plate 902 to rotate. At this time, one circular stopper plate 902 seals the inside of the T-shaped water pipe 504, while the other circular stopper plate 902 no longer seals the inside of the connecting pipe 805, so that the heating mechanism 8 can be connected to the conveying mechanism 5, thereby conveying hot water to the first temperature control mechanism 6 and the second temperature control mechanism 7. Therefore, when it is necessary to switch between sealing and opening the inside of the T-shaped water pipe 504 and the connecting pipe 805, it is only necessary to rotate the two circular stopper plates 902 by 90 degrees each time.

[0035] Specifically, the locking mechanism 10 includes a fixing plate 1001, a handle 1002, iron rods 1003, and positioning holes 1004. The fixing plate 1001 is fixedly connected to the outer surface of the T-shaped water pipe 504. The handle 1002 is slidably connected between two sliding grooves and sleeved on the outside of one of the rotating rods 901. Four iron rods 1003 are equidistantly connected to the front of the handle 1002. Four positioning holes 1004 are equidistantly opened on the back of the fixing plate 1001, and each of the four positioning holes 1004 has a magnet connected inside. The ends are respectively movably inserted into the four positioning holes 1004 and attracted to the four magnets. Pulling the handle 1002 can make it slide inside the two slide grooves, and the handle 1002 drives the four iron rods 1003 to withdraw from the four positioning holes 1004 and separate from the four magnets. At this time, the handle 1002 can drive one of the rotating rods 901 to rotate. Pushing the handle 1002 in the opposite direction allows the four iron rods 1003 to re-insert into the four positioning holes 1004, which can lock the rotation of one of the rotating rods 901 again.

[0036] Specifically, a cylinder is connected to the top of the U-shaped frame 1, and the output end of the cylinder extends to the inside of the U-shaped frame 1 and connects to the top of the upper mold 2. Multiple bases are connected to the bottom of the U-shaped frame 1 and the bottom of the horizontal plate. By starting the cylinder, the output end of the cylinder can drive the upper mold 2 to descend and close with the lower mold 4, so that the mold base 3 and the mold core inside the lower mold 4 can cooperate to form a pre-injection molded part cavity. With the action of multiple bases, the stability of the device during operation can be improved and shaking can be reduced.

[0037] Working principle: During the injection molding of the washing machine shell, the internal temperature of the lower mold 4 is at room temperature. Then, the cylinder is activated, and its output drives the upper mold 2 to descend until the upper mold 2 drives the mold base 3 into the lower mold 4. At this point, the upper mold 2 and lower mold 4 are closed. Then, the raw material is injected into the mold cavity formed by the lower mold 4 and mold base 3 through the injection port at the top of the upper mold 2. After injection, the temperature of the lower mold 4 and mold base 3 is too high. Water is then added to the cooling tank 501. The cooling surface of the cooling plate 503 continuously cools the water inside the cooling tank 501. Subsequently, the first centrifugal pump 502 is activated. The input end of the first centrifugal pump 502 draws cold water from inside the cooling tank 501. The cold water is then distributed through the T-shaped water pipe 504, allowing the water to flow freely. The cold water is supplied to the interior of the first annular water pipe 601 and the second annular water pipe 701 through the inlet pipe 603, the first flexible hose 703, and the fixed pipe 702, respectively. The cold water inside the first annular water pipe 601 and the second annular water pipe 701 contacts the inner wall of the rectangular groove and the mold base 3, which can cool the lower mold 4 and the mold base 3. This achieves cooling of the injection-molded washing machine shell from the inside out and from the outside in, thereby improving the cooling and molding rate of the washing machine shell. Finally, the cold water returns to the interior of the cooling tank 501 through the return pipe 602 and the second flexible hose 704 for recycling. When the next injection molding is performed, since the mold base 3 and the lower mold 4 have been cooled as described above, the mold base 3 and the lower mold 4 are in a relatively cold state. Then, the cold water is drained through the drain valve 803. Water from inside the cooling box 501 is diverted to the insulation box 801, where it is continuously heated by multiple heating rods 802. Then, by forcefully pulling the handle 1002, it slides against the inner wall of the two sliding grooves, causing the four iron rods 1003 to separate from the four magnets and withdraw from the four positioning holes 1004. This releases the lock on one of the rotating rods 901. At this point, the handle 1002 can be rotated to rotate one of the rotating rods 901 90 degrees. The rotation of one of the rotating rods 901 causes one of the circular stoppers 902 to rotate 90 degrees, thus blocking the water inlet of the T-shaped water pipe 504. Then, one bevel gear 903 drives another bevel gear 903 to rotate another rotating rod 901 90 degrees. Then, another circular stopper plate 902 flips over, no longer sealing the inside of the connecting pipe 805. After adjustment, the push handle 1002 drives the four iron rods 1003 to re-insert into the four positioning holes 1004, thus locking the rotation of one of the rotating rods 901. This completes the switching between sealing and opening the T-shaped water pipe 504 and the connecting pipe 805. Subsequently, the second centrifugal pump 804 is started. The input end of the second centrifugal pump 804 can transport water through the connecting pipe 805 to the inside of the T-shaped water pipe 504. Then, the hot water is continuously transported to the first temperature control mechanism 6 and the second temperature control mechanism 7 through the diversion of the T-shaped water pipe 504. The hot water in the first temperature control mechanism 6 and the second temperature control mechanism 7 preheats the lower mold 4 and the mold base 3.This design avoids excessive temperature difference between the cooler lower mold 4 and the raw material during injection molding, which could cause premature solidification of the raw material. Finally, hot water flows back into the insulation box 801 through the cooling box 501 for further heating, thus achieving continuous preheating of the lower mold 4 and the mold base 3.

[0038] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. An injection molding apparatus for producing washing machine casings, comprising a U-shaped frame (1) and an upper mold (2), characterized in that, The bottom of the upper mold (2) is connected to the mold base (3), the bottom of the inner wall of the U-shaped frame (1) is connected to the lower mold (4), the interior of the lower mold (4) is provided with a rectangular groove, the back of the U-shaped frame (1) is connected to a horizontal plate, the top of the horizontal plate is provided with a conveying mechanism (5), the interior of the rectangular groove is provided with a first temperature control mechanism (6), the interior of the mold base (3) is provided with a second temperature control mechanism (7), and the first temperature control mechanism (6) and the second temperature control mechanism (7) respectively penetrate the lower mold (4) and the upper mold (2) and extend to the back of the U-shaped frame (1) and connect with the conveying mechanism (5), the top of the horizontal plate is provided with a heating mechanism (8), and the heating mechanism (8) is connected with the conveying mechanism (5), the connection between the conveying mechanism (5) and the heating mechanism (8) is provided with a blocking mechanism (9), the conveying mechanism (5) is provided with a locking mechanism (10), and the locking mechanism (10) is connected with the blocking mechanism (9).

2. The injection molding apparatus for producing washing machine casings according to claim 1, characterized in that, The conveying mechanism (5) includes a cooling box (501), a first centrifugal pump (502), a cooling plate (503), and a T-shaped water pipe (504). The cooling box (501) is connected to the top of the horizontal plate. The first centrifugal pump (502) is connected to the top of the cooling box (501), and the input end of the first centrifugal pump (502) extends into the interior of the cooling box (501). The cooling plate (503) is fixedly connected to the back of the cooling box (501), and the cooling plate (503) extends into the interior of the cooling box (501). The T-shaped water pipe (504) is connected to the output end of the first centrifugal pump (502).

3. The injection molding apparatus for producing washing machine casings according to claim 2, characterized in that, The first temperature control mechanism (6) includes a first annular water pipe (601), a return water pipe (602), and an inlet water pipe (603). The first annular water pipe (601) is wound around the inner wall of the rectangular groove. The return water pipe (602) is connected to the lower part of the outer surface of the first annular water pipe (601), and one end of the return water pipe (602) passes through the lower mold (4) and the U-shaped frame (1) and is connected to the front of the cooling box (501). The inlet water pipe (603) is connected to one end of the T-shaped water pipe (504), and one end of the inlet water pipe (603) extends into the interior of the rectangular groove and is connected to the upper part of the outer surface of the first annular water pipe (601).

4. The injection molding apparatus for producing washing machine casings according to claim 2, characterized in that, The second temperature control mechanism (7) includes a second annular water pipe (701), a fixed pipe (702), a first flexible hose (703), and a second flexible hose (704). The second annular water pipe (701) is attached to the inner wall of the mold base (3). The fixed pipe (702) is connected to the upper part of the outer surface of the second annular water pipe (701) and extends through the upper mold (2) to the outside of the upper mold (2). The first flexible hose (703) is connected to the other end of the T-shaped water pipe (504) and one end of the first flexible hose (703) is connected to one end of the fixed pipe (702). The second flexible hose (704) is connected to the lower part of the outer surface of the second annular water pipe (701) and one end of the second flexible hose (704) extends through the upper mold (2) and is connected to the top of the cooling box (501).

5. The injection molding apparatus for producing washing machine casings according to claim 3, characterized in that, The heating mechanism (8) includes an insulation box (801), multiple heating rods (802), a drain valve (803), a second centrifugal pump (804), and a connecting pipe (805). The insulation box (801) is connected to the top of the horizontal plate. The multiple heating rods (802) are all connected to one side of the insulation box (801), and one end of each heating rod (802) extends into the interior of the insulation box (801). The drain valve (803) is connected between the insulation box (801) and the cooling box (501). The second centrifugal pump (804) is connected to the top of the insulation box (801), and the input end of the second centrifugal pump (804) extends into the interior of the insulation box (801). The connecting pipe (805) is connected to the output end of the second centrifugal pump (804), and one end of the connecting pipe (805) is connected to the outer surface of the T-shaped water pipe (504).

6. The injection molding apparatus for producing washing machine casings according to claim 1, characterized in that, The blocking mechanism (9) includes two rotating rods (901), a circular stop plate (902), and a bevel gear (903). The two rotating rods (901) are rotatably connected to the inner surfaces of the connecting pipe (805) and the T-shaped water pipe (504), and one end of the two rotating rods (901) extends to the outside of the connecting pipe (805) and the T-shaped water pipe (504), respectively. Two grooves are opened on the outer surface of one of the rotating rods (901).

7. The injection molding apparatus for producing washing machine casings according to claim 6, characterized in that, The two circular stoppers (902) are fixedly connected to the outer surfaces of the two rotating rods (901), and the two bevel gears (903) are connected to one end of the two rotating rods (901) respectively, and the two bevel gears (903) mesh.

8. The injection molding apparatus for producing washing machine casings according to claim 2, characterized in that, The locking mechanism (10) includes a fixing plate (1001), a throttle (1002), an iron rod (1003), and a positioning hole (1004). The fixing plate (1001) is fixedly connected to the outer surface of the T-shaped water pipe (504), and the throttle (1002) is slidably connected between two sliding grooves and sleeved on the outside of one of the rotating rods (901).

9. An injection molding apparatus for producing washing machine casings according to claim 8, characterized in that, The four iron rods (1003) are connected at equal distances to the front of the throttle (1002), and the four positioning holes (1004) are opened at equal distances to the back of the fixing plate (1001). Magnets are connected inside the four positioning holes (1004), and one end of each of the four iron rods (1003) is movably inserted into the four positioning holes (1004) and attracted to the four magnets.

10. The injection molding apparatus for producing washing machine casings according to claim 1, characterized in that, A cylinder is connected to the top of the U-shaped frame (1), and the output end of the cylinder extends to the inside of the U-shaped frame (1) and is connected to the top of the upper mold (2). Multiple bases are connected to the bottom of the U-shaped frame (1) and the bottom of the horizontal plate.

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