A centralized water return system for a die-casting machine

Abstract

The present invention discloses a centralized water return system for a die-casting machine, which includes an upper die water collection tank and a lower die water collection tray, and further includes a water-vapor separation device. The upper die water collection tank and the lower die water collection tray are both connected to the water-vapor separation device through water return pipes. The upper die water collection tank is provided with a water inlet joint connected to the upper die water outlet pipe, and the lower die water collection tray is provided with a water collection cavity, and a drain port communicating with the water return pipe is provided at the bottom of the water collection cavity. The present invention is provided with an upper die water collection tank, which can collect and return the cooling water of the upper die, and then centrally transport it to the water-vapor separation device. The provided lower die water collection tray can centrally return the cooling water of the lower die to the water-vapor separation device. The water-vapor separation device separates the water and vapor in the returned cooling water, which can quickly reduce the pressure in the system and improve the working stability of the water return system. The centralized return of the cooling water makes the pipeline setting simpler and is convenient for maintenance.

Description

Technical Field

[0001] The present invention belongs to the field of die-casting machines, and particularly relates to a centralized water return system for a die-casting machine. Background Art

[0002] A die-casting machine is a machine used for pressure casting. Under pressure, the die-casting machine injects molten metal into a mold for cooling and forming. After the mold is opened, a solid metal casting can be obtained. It was initially used for die-casting type. With the progress of science and technology and industrial production, especially with the development of industries such as automobiles, motorcycles, and household appliances, die-casting technology has developed extremely rapidly.

[0003] Before the die-casting machine opens the mold, it is necessary to cool the mold. Currently, water cooling is generally used, that is, a water return system is used for water circulation to achieve the cooling effect. However, the current water return system mainly has the following problems: First, each water return pipe is independently arranged, and each water return pipeline conducts separate water circulation. The pipeline setting is complex and not convenient for maintenance; Second, due to the high temperature of the mold, the cooling water is quickly heated, and some cooling water will be vaporized, thereby generating high pressure. This will cause the water return system to bear high pressure, which is not conducive to the stable operation of the system, and will also affect the mold opening effect and has a certain degree of danger. Summary of the Invention

[0004] To overcome the deficiencies and problems of the prior art, the present invention provides a centralized water return system for a die-casting machine, which conducts centralized water return for the upper mold and the lower mold. The pipeline setting is simpler, which is convenient for daily maintenance, and also has a water-vapor separation function, which can quickly reduce the pressure in the system and improve the working stability of the water return system.

[0005] The present invention is achieved through the following technical solutions:

[0006] A centralized water return system for a die-casting machine includes an upper mold water collection tank and a lower mold water collection tray, and also includes a water-vapor separation device. The upper mold water collection tank and the lower mold water collection tray are both connected to the water-vapor separation device through water return pipelines. The upper mold water collection tank is provided with an inlet joint connected to the upper mold water outlet pipeline. The lower mold water collection tray is provided with a water collection cavity, and a drain port communicating with the water return pipeline is provided at the bottom of the water collection cavity.

[0007] The bottom surface of the water collection cavity is conical, and the drain port is located at the lowest position of the bottom surface of the water collection cavity.

[0008] The bottom surface of the lower mold water collection tray is connected to a lower mold fixing plate. The lower mold fixing plate is provided with a water guiding hole corresponding to the drain port. A high-temperature resistant rubber pad is provided at the mouth of the water guiding hole, and the water return pipeline is connected to the bottom end of the water guiding hole.

[0009] The upper die water collecting tank is provided with a water containing cavity, and the bottom surface of the water containing cavity is provided with transverse and longitudinal guiding inclined surfaces. The docking part of the return water pipe and the upper die water collecting tank is located at the lowest position of the bottom of the water containing cavity.

[0010] The upper die water collecting tank is provided with a return water concentrating block. The return water concentrating block is provided with a concentrating water channel communicated with the water containing cavity. The water inlet joint is located on the return water concentrating block and communicated with the concentrating water channel. A check valve is arranged at the connection part of the concentrating water channel and the water containing cavity.

[0011] The water vapor separation device includes a water vapor separation tank. The tank wall of the water vapor separation tank is provided with a return water pipe joint connected with the return water pipe. The top of the water vapor separation tank is connected with a steam discharge pipe. The top of the steam discharge pipe is connected with an air extraction device. The bottom of the water vapor separation tank is connected with a drain pipe.

[0012] The upper part of the side wall of the water vapor separation tank is provided with a splash-proof plate. The splash-proof plate is in the shape of a flaring trumpet with a large top and a small bottom. The steam discharge pipe extends into the water vapor separation tank from the top surface of the water vapor separation tank, and the pipe orifice of the steam discharge pipe protrudes from the inner top surface of the water vapor separation tank.

[0013] The water vapor separation tank is a square column. There are multiple return water pipe joints, and they are distributed on two adjacent side walls inside the water vapor separation tank.

[0014] The air extraction device includes an upper conical cylinder and an air extraction fan arranged inside the upper conical cylinder. The air extraction fan is fixed at the center of the upper conical cylinder through a support frame.

[0015] The upper part of the upper conical cylinder is cylindrical, and the lower part is conical with a large top and a small bottom. The upper conical cylinder extends into the steam discharge pipe by 10 - 15 mm.

[0016] The present invention is provided with an upper die water collecting tank, which can collect and concentrate the cooling water of the upper die, and then centrally transport it to the water vapor separation device. The provided lower die water collecting tray can centrally return the cooling water of the lower die to the water vapor separation device. The water vapor separation device separates the water and vapor of the returned cooling water, which can quickly reduce the pressure in the system, improve the working stability of the return water system, and the centralized return of the cooling water makes the pipeline arrangement simpler and is convenient for maintenance. Description of the Drawings

[0017] Figure 1 is the structural schematic diagram of the present invention;

[0018] Figure 2 is the connection structural schematic diagram of the lower die water collecting tray and the lower die fixing plate in the present invention;

[0019] Figure 3 is the structural schematic diagram of the lower die water collecting tray in the present invention

[0020] Figure 4 and Figure 5 is the structural schematic diagram of the upper die water collecting tank in the present invention;

[0021] Figure 6 is a schematic structural view of the water-vapor separation device in the present invention;

[0022] Figure 7 is a schematic structural view of the water-vapor separation box in the present invention;

[0023] Figure 8 is a schematic structural view of the air extraction device in the present invention.

[0024] In the figure: 1 - upper die water collection tank, 11 - water holding cavity, 12 - return water concentration block, 121 - concentration water channel, 13 - water inlet joint, 14 - check valve, 2 - lower die water collection tray, 21 - water collection cavity, 22 - drain port, 3 - water-vapor separation device, 31 - water-vapor separation box, 311 - anti-splash plate, 312 - diversion part, 32 - return water pipe joint, 33 - steam discharge pipe, 331 - heat preservation sheath, 34 - air extraction device, 341 - upper conical cylinder, 342 - air extraction fan, 3421 - support frame, 35 - drain pipe, 4 - return water pipeline, 5 - lower die fixing plate, 51 - water diversion hole, 6 - high-temperature resistant rubber pad. Detailed implementation manners

[0025] For the convenience of understanding by those skilled in the art, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0026] As Figure 1 (refer to Figure 2 and Figure 4 ) shown, a centralized return water system of a die-casting machine includes an upper die water collection tank 1 and a lower die water collection tray 2, and further includes a water-vapor separation device 3. The upper die water collection tank 1 and the lower die water collection tray 2 are both connected to the water-vapor separation device 3 through a return water pipeline 4. The upper die water collection tank 1 is provided with a water inlet joint 13 connected to the upper die water outlet pipeline. The lower die water collection tray 2 is provided with a water collection cavity 21, and a drain port 22 communicating with the return water pipeline 4 is provided at the bottom of the water collection cavity 21. The cooling water left from the upper die flows into the upper die water collection tank 1 through the water inlet joint 13 for concentration, and then is centrally transported to the water-vapor separation device 3 through the return water pipeline 4. At the same time, the cooling water of the lower die is concentrated through the lower die water collection tray 2 and then transported to the water-vapor separation device 3 through the return water pipeline 4. The water-vapor separation device 3 separates water and vapor from the returned cooling water. The vaporized cooling water is discharged, and the liquid cooling water is recycled. This can quickly reduce the pressure in the system and improve the working stability of the return water system. And the centralized return of the cooling water makes the pipeline arrangement simpler and is convenient for maintenance.

[0027] As Figure 2 and Figure 3As shown, the bottom surface of the water collecting chamber 21 is conical, and the drain port 22 is located at the lowest position of the bottom surface of the water collecting chamber 21, which facilitates the rapid concentration and discharge of the cooling water through the drain port 22 without residue. After relevant verification, it is better to set the taper of the bottom surface of the water collecting chamber 21 at 10 - 15 degrees. The bottom surface of the lower mold water collecting tray 2 is connected to the lower mold fixing plate 5. The lower mold fixing plate 5 is provided with a water guiding hole 51 corresponding to the drain port 22. A high-temperature resistant rubber pad 6 is provided at the mouth of the water guiding hole 51. The return water pipe 4 is connected to the bottom end of the water guiding hole 51. The setting of the high-temperature resistant rubber pad 6 facilitates sealing the gas-liquid mixed cooling water to prevent the leakage of the cooling water.

[0028] As Figure 4 and Figure 5 shown, the upper mold water collecting tank 1 is provided with a water containing chamber 11. The bottom surface of the water containing chamber 11 is provided with transverse and longitudinal diversion inclined surfaces. The connection part of the return water pipe 4 and the upper mold water collecting tank 1 is located at the lowest position of the bottom of the water containing chamber 11. This structure facilitates the rapid concentration and discharge of the cooling water into the return water pipe 4. The upper mold water collecting tank 1 is provided with a return water concentration block 12. The return water concentration block 12 is provided with a concentration water channel 121 communicated with the water containing chamber 11. The water inlet joint 13 is located on the return water concentration block 12 and communicated with the concentration water channel 121. A check valve 14 is provided at the connection part of the concentration water channel 121 and the water containing chamber 11. The cooling water left in the upper mold flows into the concentration water channel 121 through the water inlet joint 13, and is collected and flows into the water containing chamber 11 through the concentration water channel 121. The provided check valve 14 can effectively prevent the cooling water from flowing back after the water containing chamber 11 is subjected to high pressure.

[0029] As Figure 6 shown, the water-vapor separation device 3 includes a water-vapor separation box 31. The box wall of the water-vapor separation box 31 is provided with a return water pipe joint 32 connected to the return water pipe 4. The top of the water-vapor separation box 31 is connected with a steam discharge pipe 33. The top of the steam discharge pipe 33 is connected with an air extraction device 34. The bottom of the water-vapor separation box 31 is connected with a drain pipe 35. The cooling water flows into the water-vapor separation box 31 through the return water pipe 4 via the return water pipe joint 32. The cooling water undergoes water-vapor separation in the water-vapor separation box 31. The liquid water is discharged through the drain pipe 35 for return water. The vaporized cooling water rises and is extracted by the air extraction device 34 after passing through the steam discharge pipe 33, thus avoiding the generation of high pressure due to the mixed reflux of the cooling water vapor. In order to prevent the operator from accidentally touching and causing scalding accidents and the formation of condensed water droplets on the pipe wall, the outer wall of the steam discharge pipe 3 is wrapped with a heat preservation sheath 31.

[0030] As Figure 7As shown in the figure, a splash-proof plate 311 is provided at the upper part of the side wall of the water-vapor separation box 31. The splash-proof plate 311 is in the shape of a flared trumpet with a larger upper part and a smaller lower part. The cooling water is sprayed into the water-vapor separation box 31 through the water return pipe joint 32. The splash-proof plate 311 can effectively prevent the liquid cooling water mixed gas from splashing and rising into the steam discharge pipe 33. The steam discharge pipe 33 extends into the water-vapor separation box 31 from the top surface of the water-vapor separation box 31, and the pipe orifice of the steam discharge pipe 33 protrudes from the inner top surface of the water-vapor separation box 31. Since the protruding part of the pipe orifice of the steam discharge pipe 33 can play a blocking role, it can further block the liquid cooling water mixed gas from rising into the steam discharge pipe 33. In order to achieve a better effect, the pipe orifice of the steam discharge pipe 33 protrudes from the inner top surface of the water-vapor separation box 1 by 20 - 25 mm.

[0031] The water-vapor separation box 31 is a square column. There are multiple water return pipe joints 32, and they are distributed on two adjacent side walls inside the water-vapor separation box 31. This structure enables the cooling water to decelerate when sprayed into the water-vapor separation box 31 through the water return pipe joint 32 by hitting the other two adjacent side walls inside the water-vapor separation box 31. The liquid cooling water flows downward, and the vaporized cooling water rapidly rises under the negative pressure of the air extraction device 34. In order to enable the liquid cooling water to rapidly converge and flow into the drain pipe 35, a conical diversion part 312 is provided at the bottom of the water-vapor separation box 31.

[0032] As Figure 8 shown in the figure, the air extraction device 34 includes an upper conical cylinder 341 and an air extraction fan 342 located inside the upper conical cylinder 341. The air extraction fan 342 is fixed to the center of the upper conical cylinder 341 through a support frame 3421. The upper part of the upper conical cylinder 341 is cylindrical, and the lower part is conical with a larger upper part and a smaller lower part. In this structure, the upper part of the upper conical cylinder 341 is relatively wide, which can enable the vaporized cooling water to be rapidly discharged. The upper conical cylinder 341 extends into the steam discharge pipe 33 by 10 - 15 mm. The part where the upper conical cylinder 341 extends into the steam discharge pipe 33 can play a blocking role, which can block the liquid cooling water mixed gas from rising into the upper conical cylinder 341.

[0033] The above embodiments are the preferred implementation manners of the present invention, and are not limitations on the present invention. Without departing from the inventive concept of the present invention, any obvious replacement is within the protection scope of the present invention.

Claims

1. A centralized water return system for a die-casting machine, comprising an upper die water collection tank (1) and a lower die water collection tray (2), Characterized in that: It further includes a water-vapor separation device (3). Both the upper die water collection tank and the lower die water collection tray are connected to the water-vapor separation device through a water return pipe (4). The upper die water collection tank (1) is provided with a water inlet joint (13) connected to the upper die water outlet pipe. The lower die water collection tray is provided with a water collection cavity (21). The bottom of the water collection cavity (21) is provided with a drain port (22) communicating with the water return pipe (4). The bottom surface of the water collection cavity (21) is conical, and the drain port (22) is located at the lowest position of the bottom surface of the water collection cavity. The bottom surface of the lower die water collection tray (2) is connected to a lower die fixing plate (5). The lower die fixing plate is provided with a water guiding hole (51) arranged corresponding to the drain port. A high-temperature resistant rubber pad (6) is provided at the mouth of the water guiding hole. The water return pipe (4) is connected to the bottom end of the water guiding hole. A water storage cavity (11) is arranged in the upper die water collection tank (1). The bottom surface of the water storage cavity (11) is provided with transverse and longitudinal guiding inclined surfaces. The connection part of the water return pipe (4) and the upper die water collection tank (1) is located at the lowest position of the bottom of the water storage cavity. A water return concentration block (12) is arranged on the upper die water collection tank (1). A centralized water channel (121) communicating with the water storage cavity is arranged in the water return concentration block. The water inlet joint is located on the water return concentration block and communicates with the centralized water channel. A check valve (14) is arranged at the connection part of the centralized water channel (121) and the water storage cavity. The water-vapor separation device (3) includes a water-vapor separation box (31). The box wall of the water-vapor separation box is provided with a water return pipe joint (32) connected to the water return pipe (4). A steam discharge pipe (33) is connected to the top of the water-vapor separation box. A ventilation device (34) is connected to the top of the steam discharge pipe. A drain pipe (35) is connected to the bottom of the water-vapor separation box. The upper part of the side wall of the water-vapor separation box (31) is provided with a splash-proof plate (311). The splash-proof plate is in the shape of a flared mouth with a larger upper part and a smaller lower part. The steam discharge pipe (33) extends into the water-vapor separation box from the top surface of the water-vapor separation box, and the pipe orifice of the steam discharge pipe protrudes 20 - 25 mm from the inner top surface of the water-vapor separation box. The upper conical cylinder (341) of the ventilation device is cylindrical in the upper part and conical with a larger upper part and a smaller lower part in the lower part. The upper conical cylinder extends 10 - 15 mm into the steam discharge pipe (33).

2. The centralized water return system for a die-casting machine according to claim 1, Characterized in that: The water-vapor separation box (31) is a square column. There are multiple water return pipe joints (32), and they are distributed on two adjacent side walls inside the water-vapor separation box.

3. The centralized water return system for a die-casting machine according to claim 2, Characterized in that: The ventilation device (34) includes an upper conical cylinder (341) and a ventilation fan (342) arranged inside the upper conical cylinder. The ventilation fan is fixed at the center of the upper conical cylinder through a support frame (3421).

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