Quantitative soup feeding device and method for die casting machine

Abstract

The invention discloses a quantitative soup feeding device and method for a die casting machine. The quantitative soup feeding device comprises a multi-axis robot, and a mounting support is arranged at the movable tail end of the multi-axis robot; the pouring tank is installed on the installation support, a pouring cavity used for containing molten metal is formed in the pouring tank, and a sucking and pouring opening allowing the molten metal to enter and exit is formed in the bottom of the pouring tank; the plug is driven by a driving piece to do reciprocating motion in the pouring cavity and is used for plugging or conducting the suction and injection opening; the vacuum system is communicated with the pouring cavity, and the pouring cavity is vacuumized to suck molten metal; the pressure adjusting module is used for adjusting the internal pressure of the pouring tank and comprises a positive pressure energy storage tank and a first pipeline for communicating the positive pressure energy storage tank with the pouring cavity; and a first control valve and a first pressure sensor are arranged on the first pipeline. Accurate molten metal taking is achieved through vacuum negative pressure, and accurate control over the molten metal taking amount is achieved; and meanwhile, the internal pressure of the pouring tank can be flexibly adjusted, and accurate adjustment of the pressure is achieved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of die casting equipment, in particular to a die casting machine quantitative soup feeding device and a soup feeding method. BACKGROUND

[0002] A die casting machine is a casting machine that obtains a solid metal casting by pressing a certain volume of metal alloy liquid into a metal mold under pressure and cooling it to form. The soup feeding device is an important peripheral equipment of the die casting equipment.

[0003] The prior art patent CN115519095A discloses a die casting machine quantitative soup feeding device with stable flow and easy maintenance, which realizes the extraction of metal liquid by lowering the pouring pot into the liquid surface of the furnace, and controls the amount of extracted metal liquid by controlling the lowering depth. However, the device has the following defects: (1) The quantitative control of extracting metal liquid in the pouring pot only relies on the monitoring of the insertion depth of the pouring pot, and the accuracy completely relies on the external liquid level probe monitoring, which has low fault tolerance and weak reliability in quantitative accuracy control; (2) After the pouring pot extracts a certain amount of metal liquid, argon gas is filled to occupy the remaining space in the pouring pot, which can prevent the oxidation of the metal liquid. However, if too much argon gas is filled, when the pouring pot feeds the metal liquid, the argon gas will enter the compression chamber with the metal liquid and be pushed into the mold cavity. The argon gas is an inert gas and does not react with the metal liquid. Therefore, when the metal liquid in the mold cavity is pressure cast into a product, it is easy to form defects such as cavities and pores, which seriously affects the quality of the die casting product; (3) When the pouring pot is filled with argon gas, if the pressure in the pouring pot is higher than the pressure in the compression chamber, the pressure in the compression chamber will increase when the pouring pot is connected to the compression chamber for feeding, which will affect the vacuum degree in the compression chamber and further affect the quality of the die casting product; (4) For different vacuum parameters of the die casting process, the device cannot adjust the pressure value in the pouring pot after extracting a certain amount of metal liquid, and thus cannot be applied to die casting processes with different vacuum parameters, which has poor versatility and flexibility.

[0004] Therefore, it is necessary to provide a new die casting machine quantitative soup feeding device and a soup feeding method to solve the above technical problems. SUMMARY

[0005] The main purpose of the present application is to provide a die casting machine quantitative soup feeding device, which realizes accurate extraction of metal liquid by using vacuum negative pressure and accurate control of the amount of extracted metal liquid. At the same time, the internal pressure of the pouring pot can be flexibly adjusted to realize accurate adjustment of the pressure.

[0006] The present application realizes the above-mentioned purposes through the following technical solutions: a die casting machine quantitative soup feeding device, comprising: A multi-axis robot, an active end of which is provided with a mounting bracket; A pouring pot, which is mounted on the mounting bracket and has a pouring cavity for containing molten metal formed inside, and a suction port provided at the bottom for the molten metal to enter or exit; A plug, which is driven by a driving element to reciprocate in the pouring cavity and is used to block or open the suction port; A vacuum system, which communicates with the pouring cavity and performs vacuumization in the pouring cavity to extract the molten metal; A pressure regulating module, which regulates the internal pressure of the pouring pot and includes a positive pressure energy storage tank and a first pipeline communicating the positive pressure energy storage tank with the pouring cavity; the first pipeline is provided with a first control valve and a first pressure sensor.

[0007] Further, the gas stored in the positive pressure energy storage tank is oxygen.

[0008] Further, the bottom of the pouring pot has a straight cylinder portion with a uniform diameter, the bottom of the straight cylinder portion forms the suction port, the top of the straight cylinder portion is adjacent to a conical portion with a gradually changing diameter, the bottom end of the conical portion is adjacent to the straight cylinder portion and the diameter decreases towards the straight cylinder portion; the conical portion and the straight cylinder portion jointly form a liquid outlet interface of the pouring pot, which is shaped to match the shape of the liquid injection port of a vacuum die casting machine.

[0009] Further, the surface roughness Ra of the outer peripheral surface of the liquid outlet interface is ≤1.6 μm.

[0010] Further, the plug is shaped to match the inner wall of the liquid outlet interface.

[0011] Further, the mounting bracket is internally provided with a cooling channel.

[0012] Further, the mounting bracket includes a lateral mounting surface, a bottom mounting surface and a top mounting surface; the driving element is sealingly mounted on the top mounting surface, the pouring pot is sealingly mounted on the bottom mounting surface, and the lateral mounting surface is fixedly connected with a mounting plate of the active end of the multi-axis robot.

[0013] Further, the mounting bracket is internally hollow to form a hollow cavity, the hollow cavity penetrates up and down and communicates with the pouring cavity, and the piston rod of the driving element extends downward into the pouring pot through the hollow cavity.

[0014] Further, the cooling channel is arranged around the hollow cavity.

[0015] Further, the pressure adjusting module for adjusting the internal pressure of the pouring pot comprises a positive pressure energy storage tank and a first pipeline connecting the positive pressure energy storage tank and the pouring cavity.

[0016] Further, the liquid level sensor for monitoring the liquid level of the metal liquid in the pouring pot is further included.

[0017] Further, the vacuum system comprises a vacuum pump and a second pipeline connecting the vacuum pump and the pouring cavity, and the second pipeline is provided with a second control valve and a second pressure sensor.

[0018] Another object of the present application is to provide a quantitative feeding method of a die casting machine, which is realized based on the quantitative feeding device of the die casting machine as described above and comprises the following steps. S1, taking soup preparation: the plug is in an open state, the multi-axis robot drives the pouring pot to move into the furnace, and the suction inlet is extended below the liquid level; S2, taking soup: the vacuum device is started to perform vacuumizing operation on the inside of the pouring pot at a set speed, until the pressure value in the pouring pot reaches the first set pressure P1, the vacuumizing is stopped, in the process, the metal liquid is gradually sucked into the pouring pot, and the amount of the metal liquid suction reaches the set volume when the vacuumizing is stopped; the driving member drives the plug to seal the suction inlet, and the multi-axis robot drives the pouring pot to move to the pouring inlet of the vacuum die casting machine; S3, adjusting the internal pressure of the pouring pot: the pressure value after the process requires the internal pressure of the pressure chamber to be vacuumized is recorded as the second set pressure P2, if the first set pressure P1 is greater than the second set pressure P2, the internal pressure of the pouring pot does not need to be adjusted; if the first set pressure P1 is less than the second set pressure P2, the pressure adjusting module is used to inject gas into the inside of the pouring pot to adjust the internal pressure of the pouring pot to be greater than or equal to the second set pressure P2; S4, feeding: the driving member drives the plug to move upward to open the suction inlet, and the metal liquid in the pouring pot enters the pressure chamber through the pouring inlet to complete the feeding.

[0019] Further, in step S3, the pressure adjusting module is used to inject gas into the inside of the pouring pot to adjust the internal pressure of the pouring pot to be greater than or equal to the second set pressure P2, which comprises: If the first set pressure P1 is less than the second set pressure P2, it is judged whether the first set pressure P1 is less than or equal to the third set pressure P3, if yes, the pressure adjusting module is directly used to inject gas into the inside of the pouring pot to adjust the internal pressure of the pouring pot to be greater than or equal to the second set pressure P2; otherwise, the vacuum device continues to vacuumize the inside of the pouring pot until the third set pressure P3 is reached, and then the pressure adjusting module is used to inject gas into the inside of the pouring pot to adjust the internal pressure of the pouring pot to be greater than or equal to the second set pressure P2.

[0020] Compared with the prior art, the quantitative soup feeding device and the soup feeding method of the die casting machine have the following advantages: (1) Significantly improve the sealing of the interface, reduce the oxidation of the metal liquid: the bottom of the pouring pot adopts a straight cylinder part and a conical part to form a liquid outlet interface, which forms a profiled cooperation with the liquid injection port of the vacuum die casting machine, and the cooperation gap is controlled within 5-10mm and the surface roughness Ra≤1.6μm, which lays a foundation for the formation of a vacuum sealing zone; combined with the vacuum channel at the liquid injection port of the vacuum die casting machine, a stable negative pressure sealing zone can be formed in the interface gap, effectively blocking the entry of external air into the pressure chamber, avoiding the oxidation of the metal liquid during the soup feeding process, and ensuring the quality of the castings from the source.

[0021] (2) Realize precise quantitative extraction of the metal liquid and improve the soup feeding accuracy: the metal liquid is extracted by a progressive vacuum extraction method of the vacuum pump, a correlation formula between pressure and metal liquid volume is established by combining the Boyle's law, the second pressure sensor is used to monitor the pressure in the pouring pot in real time, and the timing of stopping vacuum extraction (reaching the first set pressure) is accurately controlled; at the same time, the liquid level sensor is used to monitor the liquid level height of the metal liquid, forming a double closed-loop feedback to ensure the accuracy of the metal liquid extraction amount. Compared with the traditional strong vacuum liquid extraction method, the quantitative error caused by the violent stirring and gas entrainment of the metal liquid can be avoided, and the quantitative accuracy is significantly improved.

[0022] (3) Optimize the pressure regulation mechanism to ensure smooth and efficient soup feeding: for the pressure difference between the pouring pot and the pressure chamber, a pressure regulation module is set, and the positive pressure energy storage tank is used to inject gas (preferably pure oxygen) into the pouring pot, so that the pressure in the pouring pot is higher than or equal to the pressure in the pressure chamber (the second set pressure), solving the problem of slow or failed soup feeding caused by the pressure difference. At the same time, through the threshold control of the third set pressure, the residual nitrogen gas in the pouring pot is strictly replaced, and the micro-reaction between oxygen and the metal liquid is used to eliminate the casting cavity defects caused by nitrogen gas, taking into account the soup feeding efficiency and the quality of the castings.

[0023] (4) Compact structure and good heat dissipation, improve the stability of the equipment: the installation bracket adopts a hollow cavity design, realizing the compact layout of the driving part and the pouring pot, meeting the miniaturization requirement; the cooling channel arranged around the hollow cavity can effectively block the high temperature of the pouring pot from being transmitted to the multi-axis robot and the driving part, avoiding the performance impact of high temperature on the equipment components, prolonging the service life of the equipment, and ensuring long-term stable operation.

[0024] (5) Whole-process closed-loop monitoring to ensure the reliability of the soup feeding: from the metal liquid extraction (double monitoring of the pressure sensor + liquid level sensor), the pressure regulation (real-time feedback of the first pressure sensor) to the soup feeding process (liquid level sensor monitoring liquid level change), the whole process parameter monitoring and dynamic adjustment is realized, ensuring that each step is reliably executed, greatly reducing the risk of soup feeding failure, and improving the continuity and stability of the die casting production.

[0025] In summary, the present application optimizes the sealing design, accurately controls the quantity, intelligently adjusts the pressure, and arranges the compact structure, thereby comprehensively improving the sealing, precision, and efficiency of the feeding process, effectively reducing defects such as oxidation and porosity of castings, and being suitable for large-scale production in high-precision vacuum die casting scenarios. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 is a structural principle schematic diagram of an embodiment of the present application; Figure 2 is a physical structure schematic diagram of an embodiment of the present application; Figure 3 is a structural schematic diagram of a movable end of a multi-axis robot in an embodiment of the present application; Figure 4 is a structural schematic diagram of a mounting bracket in an embodiment of the present application; Figure 5 is a structural schematic diagram when an embodiment of the present application cooperates with a liquid injection port of a vacuum die casting machine; Numerals in the figure represent: 100 - vacuum solenoid valve; 200 - furnace; 300 - liquid injection port of vacuum die casting machine, 301 - vacuum belt; 400 - pressure chamber; 1 - multi-axis robot; 2 - mounting bracket, 21 - cooling channel, 22 - lateral mounting surface, 23 - bottom mounting surface, 24 - top mounting surface, 25 - hollow cavity; 3 - pouring pot, 31 - suction port, 32 - pouring cavity, 33 - straight cylinder part, 34 - conical part; 4 - driving member; 5 - plug; 6 - vacuum system, 61 - vacuum pump, 62 - second pipeline, 621 - second control valve, 622 - second pressure sensor; 7 - pressure adjustment module, 71 - positive pressure energy storage tank, 72 - first pipeline, 721 - first control valve, 722 - first pressure sensor; 8 - liquid level sensor. DETAILED DESCRIPTION

[0027] Embodiment one: Please refer to Figures 1-5 The present embodiment is a quantitative feeding device 100 for a die casting machine, which comprises a multi-axis robot 1, a mounting bracket 2 arranged at the movable end of the multi-axis robot 1, a pouring pot 3 fixed at the bottom of the mounting bracket 2 and having a suction port 31 at the end, a driving member 4 fixed on the mounting bracket 2, a plug 5 driven by the driving member 4 to move up and down in the pouring pot 3 and used to block the suction port 31, and a vacuum system 6 communicating with the inside of the pouring pot 3, and the inside of the pouring pot 3 forms a pouring cavity 32, and the vacuum system 6 is used to vacuum the inside of the pouring cavity 32 to use negative pressure to suck in the metal liquid.

[0028] In this embodiment, the multi-axis robot 1 is used to drive the pouring pot 3 to transfer position between the furnace 200 and the liquid injection port (not shown in the figure) of the vacuum die casting machine; the mounting bracket 2 is used to fix the pouring pot 3 and the driving member 4; the pouring pot 3 is used as a carrying container for the metal liquid; the plug 5 is used to block the suction port 31 at the bottom of the pouring pot 3, on the one hand, before sucking the metal liquid, the plug 5 seals the pouring pot 3 so that the vacuum system 6 acts on the pouring cavity 32 to remove the air inside the pouring cavity 32, so that a negative pressure environment with a certain vacuum degree is formed inside the pouring cavity 32, realizing the extraction of the metal liquid; on the other hand, after the pouring pot 3 sucks the metal liquid and during the transfer to the liquid injection port of the vacuum die casting machine, the plug seals the pouring pot 3, which can effectively prevent the metal liquid from leaking out of the pouring pot 3.

[0029] In order to improve the sealing performance of the pouring pot 3 and the liquid injection port 300 of the vacuum die casting machine, the bottom of the pouring pot 3 has a straight cylinder part 33 with the same diameter, the bottom of the straight cylinder part 33 forms the suction port 31, the top of the straight cylinder part 33 is adjacent to the conical part 34 with a gradually changing diameter, the bottom end of the conical part 34 is adjacent to the straight cylinder part 33 and the diameter decreases towards the straight cylinder part 33. The conical part 34 and the straight cylinder part 33 together form the liquid outlet interface of the pouring pot 3, through the structural design of the conical part 34 and the straight cylinder part 33, the shape of the liquid injection port 300 of the vacuum die casting machine is also designed to be compatible with the shape of the conical part 34 and the straight cylinder part 33, so that the gap between the outer periphery of the liquid outlet interface and the inner wall of the liquid injection port of the vacuum die casting machine is controlled within 5-10mm, in addition, in this embodiment, the surface roughness Ra of the outer periphery surface of the liquid outlet interface is ≤1.6μm, through the design of gap control and surface roughness, it lays an important foundation for realizing the vacuum band sealing structure between the outer periphery of the liquid outlet interface and the liquid injection port 300 of the vacuum die casting machine, a vacuum channel connected to the liquid injection port can be designed inside the vacuum die casting machine, a vacuum negative pressure is formed in the gap space between the outer periphery of the liquid outlet interface and the liquid injection port 300 of the vacuum die casting machine, and then a vacuum sealing band is formed, thereby realizing the sealing between the outer periphery of the liquid outlet interface and the liquid injection port 300 of the vacuum die casting machine, on the one hand, effectively preventing the oxidation of the metal liquid, on the other hand, improving the sealing performance of the pressure chamber inside the vacuum die casting machine, and ensuring the effective pushing of the vacuum punch to the metal liquid pouring in the pressure chamber.

[0030] The shape of the plug 5 is designed to be compatible with the inner wall of the liquid outlet interface.

[0031] Since the temperature of the metal liquid is high, in order to block the high temperature on the pouring pot 3 from being transmitted to the end of the multi-axis robot 1 and the driving member 4, and prevent affecting the effective operation of the multi-axis robot 1 and the driving member 4, a cooling channel 21 is arranged inside the mounting bracket 2 in this embodiment.

[0032] In order to realize the miniaturized structure design, in the embodiment, the mounting bracket 2 includes a lateral mounting surface 22, a bottom mounting surface 23 and a top mounting surface 24, the inside of the mounting bracket 2 is hollow to form a hollow cavity 25, the hollow cavity 25 penetrates up and down, the driving member 4 is sealingly mounted on the top mounting surface 24, the pouring pot 3 is sealingly mounted on the bottom mounting surface 23, the lateral mounting surface 22 is fixedly connected with the mounting plate of the movable end of the multi-axis robot 1; the piston rod of the driving member 4 penetrates the hollow cavity 25 and extends downward into the inside of the pouring pot 3; the overall structure is compact, the layout is reasonable, and the miniaturized structure design is realized.

[0033] In the embodiment, the hollow cavity 25 is communicated with the pouring cavity 32 in the inside of the pouring pot 3, so that the piston rod of the driving member 4 can extend into the inside of the pouring cavity 32. The cooling channel 21 is arranged around the hollow cavity 25, which effectively blocks the heat transfer to the end of the multi-axis robot 1 and the end of the driving member 4.

[0034] Since the pouring pot 3 needs to be connected with the liquid injection port 300 of the die casting mold for pouring in the subsequent process, the vacuum pressure value in the inside of the pressure chamber 400 of the die casting mold will change due to different product die casting processes. Therefore, there is a pressure value in the inside of the pressure chamber after vacuumizing, which is recorded as a second set pressure P2. After a certain amount of metal liquid is extracted from the inside of the pouring pot 3, there is also a set pressure value in the inside of the pouring pot 3, which is recorded as a first set pressure P1. The first set pressure P1 and the second set pressure P2 cannot be exactly equal, and in most cases, there will be a pressure difference between the two. If the first set pressure P1 is lower than the second set pressure P2, the pouring speed of the pouring pot 3 will become very slow when the pouring pot 3 is connected with the liquid injection port 300 for pouring. If the pressure difference between the two is too large, the metal liquid in the pouring pot 3 cannot even enter the pressure chamber 400, resulting in pouring failure.

[0035] Therefore, in order to solve the above technical problems, the embodiment also provides a pressure adjusting module 7 for adjusting the internal pressure of the pouring pot 3. Specifically, the pressure adjusting module 7 comprises a positive pressure energy storage tank 71 and a first pipeline 72 communicating the positive pressure energy storage tank 71 and the pouring cavity 32. The first pipeline 72 is provided with a first control valve 721 and a first pressure sensor 722. The first control valve 721 is used to control the conduction and blockage of the first pipeline 37. The first pressure sensor 722 is used to monitor the pressure inside the first pipeline 37 and the pouring pot 3 in real time. When the pressure value in the pouring pot 3 after extracting a certain amount of metal liquid is less than the pressure value in the pressure chamber 400 after vacuumizing, the first control valve 721 can be opened, and the positive pressure gas stored in the positive pressure energy storage tank 71 is released into the pouring pot 3, so as to increase the internal pressure of the pouring pot 3 and make it higher than or equal to the pressure value in the pressure chamber 400 after vacuumizing. Therefore, when the pouring pot 3 is used for pouring, the metal liquid can quickly and efficiently enter the internal pressure chamber 400 under the action of gravity or pressure, and the technical problem of low pouring efficiency or pouring failure caused by the internal pressure of the pouring pot 3 being less than the internal pressure of the pressure chamber 400 is solved. Meanwhile, the pressure difference between the internal pressure of the pouring pot 3 and the internal pressure of the pressure chamber 400 can be used to improve the pouring efficiency.

[0036] In addition, after extracting a certain amount of metal liquid from the pouring pot 3, there is still a space above the pouring pot 3, and some air is left in the space. About 80% of the air is nitrogen. Although the total amount of nitrogen left in the pouring pot 3 is not large in a low-pressure environment, nitrogen is an inert gas. When the pouring pot 3 is used for pouring at the liquid injection port 300, the nitrogen in the pouring pot 3 also enters the pressure chamber 400. When the pressure ram works, the nitrogen is pushed into the mold cavity together with the metal liquid. The nitrogen stays in the mold cavity and is wrapped by the metal liquid because it cannot react with the metal liquid. The nitrogen can easily form defects such as cavities and pores in the internal pressure chamber 400, which seriously affects the quality of the die-cast product. In order to solve the technical problem, the gas stored in the positive pressure energy storage tank 71 in the embodiment is preferably a gas that can react with the metal liquid, and is preferably pure oxygen. The total volume of the pouring pot 3 is not very large, for example, it is generally 10L. After extracting a certain amount of metal liquid, the remaining space volume is smaller. The internal pressure of the pouring pot 3 is very low when it is used for metal pouring, for example, it is 200-500mbar. In such a small low-pressure environment and small space, the content of oxygen is even lower. After being pushed into the pressure chamber, the very small amount of oxygen will react with the metal liquid. For example, oxygen reacts with aluminum liquid to generate aluminum dioxide. The reaction product may adhere to the inner wall of the pressure chamber or enter the mold cavity together with the metal liquid. The small amount of product does not have a great impact on the quality of the die-cast product, and can be ignored compared to the cavity and pore defects caused by nitrogen in the die-cast product.

[0037] The vacuum system 6 comprises a vacuum pump 61 and a second pipeline 62 connecting the vacuum pump 61 and the pouring cavity 32, and the second pipeline 62 is provided with a second control valve 621 and a second pressure sensor 622. The second control valve 621 is used to control the conduction and blockage of the second pipeline 62, and the second pressure sensor 622 is used to monitor the pressure inside the second pipeline 62 in real time. The vacuum pump 61 and the second pipeline 62 can realize the vacuumization of the inside of the pouring ladle 3.

[0038] In this embodiment, since the object of the vacuum system 6 is the pouring ladle 3 with high temperature, the vacuum pump 61 is a high-temperature-resistant vacuum pump. The materials of the first pipeline 63 and the second pipeline 62 are also preferably high-temperature-resistant materials.

[0039] In this embodiment, the second pressure sensor 622 is used to monitor the pressure value in the pouring ladle 3, and based on the physical correlation between gas pressure and liquid volume, combined with the flowability of the aluminum liquid and the pressure balance characteristics of the sealed space, the precise control of the suction amount of the metal liquid in the pouring ladle 3 can be realized. Specifically, the process of the metal liquid entering the pouring ladle 3 can be regarded as that the pressure difference between the external pressure and the negative pressure in the ladle drives the aluminum liquid to rise until the gas pressure above the liquid level in the ladle is balanced with the metal liquid gravity and the liquid level pressure. According to the principle of fluid mechanics, when the volume of the pouring ladle 3 is fixed, the increase of the volume of the metal liquid will compress the volume of the remaining gas in the ladle, resulting in the increase of the pressure in the pouring ladle 3 (according to the Boyle's law: at a certain temperature, the gas pressure is inversely proportional to the volume), and the pressure difference will decrease accordingly. Therefore, the change of the pressure difference can directly reflect the change of the volume of the metal liquid, and under the condition that the external atmospheric pressure P0 is unchanged, the change value of the internal pressure of the pouring ladle 3 is ΔP, and by presetting the target ΔP (corresponding to the target metal liquid amount), the stopping time of the vacuumization can be controlled.

[0040] If the required quantitative volume of the metal liquid to be extracted is V1, the corresponding pressure in the pouring ladle 3 needs to be extracted to a first set pressure P1, and the vacuumization is stopped when the pressure in the pouring ladle 3 reaches P1, and the second control valve 621 is closed. Then the formula is converted as follows: , Then: , Wherein, ρ is the density of the metal liquid, g is the acceleration of gravity (about 9.8 m / s²), h is the liquid level height of the metal liquid in the pouring ladle, h can be calculated by the cross-sectional area of the pouring ladle and the volume of the metal liquid to be extracted in the pouring ladle, V0 is the total volume of the pouring ladle, and V1 is the volume of the metal liquid to be extracted. P0 is the pressure value before the vacuumization of the pouring ladle (generally the external atmospheric pressure P0), P1 is the pressure value after the vacuumization of the pouring ladle, and P0 is the external atmospheric pressure.

[0041] Therefore, P1 can be calculated by the above formula, the stopping timing of vacuumizing is accurately controlled, and the precise control of the metal liquid extraction is realized.

[0042] In the embodiment, the metal liquid is extracted by gradually vacuumizing the pouring tank 3 by the vacuum pump 61, instead of directly vacuumizing the pouring tank 3 to form a negative pressure cavity with a large negative pressure value, and then extracting the metal liquid in the furnace by the powerful negative pressure cavity. If a large negative pressure cavity is formed in the pouring tank 3 in advance, when the pouring tank 3 is inserted into the furnace below the liquid surface, the metal liquid surface will form a strong surge and bubbling phenomenon at the moment when the plug 5 is opened, which is easy to bring the gas in the pouring tank 3 into the furnace, and affects the precise quantitative extraction of the metal liquid in the pouring tank 3.

[0043] The embodiment also comprises a liquid level sensor 8 for monitoring the liquid level height of the metal liquid in the pouring tank 3. When the vacuum pump 61 vacuumizes the pouring tank 3 to realize the quantitative extraction of the metal liquid, on the one hand, the second pressure sensor 622 is used to monitor whether the pressure in the pouring tank 3 reaches the first set pressure P1, and on the other hand, the liquid level sensor 8 is used to monitor whether the metal liquid in the pouring tank 3 reaches the set height, to realize the closed-loop feedback, and guarantee the reliability and effectiveness of the quantitative extraction of the metal liquid. In addition, when the pouring tank 3 is used to pour the metal liquid to the pouring port 300, the liquid level sensor 8 is used to monitor the change of the liquid surface of the metal liquid in the pouring tank 3, which can effectively feedback whether the metal liquid is released from the pouring tank 3, and perform the pouring operation, and further achieve the effect of monitoring whether the pouring process is reliably and effectively performed.

[0044] The embodiment also provides a quantitative pouring method of the die casting machine with high sealing property, which comprises the following steps. (1) In the initial state, the initial pressure in the pouring tank 3 is the atmospheric pressure, the suction port 31 (the plug 5) is in an open state, the multi-axis robot 1 drives the pouring tank 3 to descend and insert into the furnace 200, and the suction port 31 is placed below the liquid surface of the furnace 200; (2) The first control valve 65 is closed, the second control valve 621 is opened, the vacuum pump 61 is started, and the pouring cavity 32 is vacuumized at a set speed to form a negative pressure environment, and the vacuumizing is stopped when the pressure value in the pouring tank 3 reaches the first set pressure P1, in the process, the quantitative metal liquid is sucked into the pouring tank 3; the liquid level sensor 8 monitors that the metal liquid reaches the set height; (3) At this time, the metal liquid extraction in the pouring cavity 32 reaches the set amount, and the driving part 4 drives the plug 5 to descend and block the suction port 31; (4) The multi-axis robot 1 drives the pouring tank 3 to ascend and take out from the furnace 200, and then moves to the vacuum die casting machine pouring port 300; (5) During the execution of step (4), the pressure regulating module 7 regulates the pressure of the ladle 3: The process requires that the inside of the pressure chamber 400 be vacuumed to reach a second set pressure P2 (for example, 200-500 mbar). If the first set pressure P1 is greater than the second set pressure P2, the pressure inside the ladle 3 does not need to be adjusted. If the first set pressure P1 is less than the second set pressure P2, it is determined whether the first set pressure P1 is less than or equal to a third set pressure P3 (for example, 10-50 mbar). If it is less, the second control valve 621 is closed, the first control valve 721 is opened, and gas is injected into the inside of the ladle 3 through the positive pressure energy storage tank 71 to adjust the pressure inside the ladle 3 to be greater than or equal to the second set pressure P2. Otherwise, the vacuum pump 61 continues to vacuum the inside of the ladle 3 until the third set pressure P3 is reached, then the second control valve 621 is closed, the first control valve 721 is opened, and gas is injected into the inside of the ladle 3 through the positive pressure energy storage tank 71 to adjust the pressure inside the ladle 3 to be greater than or equal to the second set pressure P2. In step (5), when the pressure inside the ladle 3 needs to be adjusted, the embodiment sets a pressure threshold for gas replacement, the third set pressure P3. If the pressure (the first set pressure P1) after the ladle 3 extracts a certain amount of metal liquid is lower than or equal to the pressure threshold, it means that the nitrogen content in the remaining space inside the ladle 3 is extremely low and can be ignored. At this time, oxygen is directly filled into the inside of the ladle 3 through the positive pressure energy storage tank 71 to adjust the pressure. If the pressure (the first set pressure P1) after the ladle 3 extracts a certain amount of metal liquid is higher than the pressure threshold, it is considered that the nitrogen content in the remaining space inside the ladle 3 is within the range that can cause product defects, and oxygen cannot be directly filled to adjust the pressure. The gas in the remaining space inside the ladle 3 needs to be extracted to the pressure threshold first, and then oxygen can be filled to adjust the pressure, achieving the purpose of strictly controlling the nitrogen content in the ladle 3. (5) The vacuum belt 301 at the liquid injection port 300 of the vacuum die casting machine is started to realize the sealing of the outflow docking part of the ladle 3 and the liquid injection port. After the inside of the pressure chamber 400 reaches the set vacuum degree environment, the driving member 4 drives the plug 5 to rise, and the metal liquid in the pouring cavity 32 flows out into the pressure chamber to realize the feeding. During the whole process, the metal liquid does not contact air, which can effectively avoid oxidation.

[0045] For those skilled in the art, without departing from the inventive concept, a number of modifications and improvements can be made, which are within the scope of the present application.

Claims

1. A transfer machine dosing apparatus characterised in that: It includes: Multi-axis robot, the movable end is provided with a mounting bracket; Pouring pot, mounted on the mounting bracket and internally formed with a pouring cavity for containing metal liquid, the bottom is provided with a suction port for metal liquid in and out; Plug, driven by a driving member to reciprocate in the pouring cavity and used to block or open the suction port; Vacuum system, communicating with the pouring cavity, and vacuumizing in the pouring cavity to extract metal liquid; Pressure regulating module, adjusting the internal pressure of the pouring pot, and including a positive pressure energy storage tank and a first pipeline communicating the positive pressure energy storage tank and the pouring cavity; the first pipeline is provided with a first control valve and a first pressure sensor.

2. The machine for the transfer-moulding of containers according to claim 1, characterized in that: The gas stored in the positive pressure energy storage tank is oxygen.

3. The transfer machine dosing apparatus of claim 1 wherein: The bottom of the pouring pot has a straight cylinder part with consistent diameter, the bottom of the straight cylinder part forms the suction port, the top of the straight cylinder part is adjacent to a conical part with gradually changed diameter, the bottom end of the conical part is adjacent to the straight cylinder part and the diameter decreases towards the straight cylinder part; the conical part and the straight cylinder part jointly form a liquid outlet interface of the pouring pot, which is shaped to match the shape of the liquid injection port of the vacuum die casting machine.

4. The machine for the transfer of the soup according to claim 2, characterized in that: The surface roughness Ra of the outer peripheral surface of the liquid outlet interface is ≤1.6μm.

5. The die casting machine dosing apparatus of claim 1 wherein: The shape of the plug is shaped to match the inner wall of the liquid outlet interface.

6. The die casting machine dosing apparatus of claim 1 wherein: The mounting bracket is internally provided with a cooling channel.

7. The die casting machine dosing apparatus of claim 1 wherein: The mounting bracket includes a lateral mounting surface, a bottom mounting surface and a top mounting surface; the driving member is sealingly mounted on the top mounting surface, the pouring pot is sealingly mounted on the bottom mounting surface, and the lateral mounting surface is fixedly connected with a mounting plate of the movable end of the multi-axis robot.

8. The machine for the transfer of the soup according to claim 5, characterized in that: The mounting bracket is internally hollowed to form a hollow cavity, the hollow cavity penetrates up and down and communicates with the pouring cavity, and the piston rod of the driving member penetrates downward into the interior of the pouring pot through the hollow cavity.

9. The machine for the transfer of the soup according to claim 7, characterized in that: The cooling channel is arranged around the hollow cavity.

10. The transfer machine dosing apparatus of claim 1 wherein: It also includes a liquid level sensor for monitoring the liquid level of the metal liquid in the pouring pot.

11. The die casting machine dosing apparatus of claim 1 wherein: The vacuum system includes a vacuum pump and a second pipeline communicating the vacuum pump and the pouring cavity, and the second pipeline is provided with a second control valve and a second pressure sensor.

12. A method of dosing soup for a die casting machine, characterized by: The die casting machine quantitative soup device is realized based on any one of claims 1-11, including the following steps: S1, soup preparation: the plug is in an open state, the multi-axis robot drives the pouring pot to move into the furnace, and the suction port is inserted below the liquid level; S2, soup taking: the vacuum device is started to perform vacuumizing operation on the interior of the pouring pot at a set speed, until the pressure value in the pouring pot reaches a first set pressure P1, the vacuumizing is stopped, in this process, the metal liquid is gradually sucked into the pouring pot, and the amount of metal liquid suction reaches a set volume when the vacuumizing is stopped; the driving member drives the plug to block the suction port, and the multi-axis robot drives the pouring pot to move to the pouring port of the vacuum die casting machine; S3, pouring ladle internal pressure regulation: process requirement pressure chamber internal vacuum after the pressure value is recorded as the second set pressure P2, if the first set pressure P1 is greater than the second set pressure P2, then no need to adjust the pouring ladle internal pressure; If the first set pressure P1 is less than the second set pressure P2, then by pressure regulating module to the pouring ladle internal injection of gas, adjust the pouring ladle internal pressure greater than or equal to the second set pressure P2; S4, give soup: drive the plug to move up, open the suction nozzle, pouring ladle metal liquid into the pressure chamber via pouring mouth, complete the soup.

13. The transfer machine dosing method of claim 12 wherein: In step S3, by pressure regulating module to the pouring ladle internal injection of gas, adjust the pouring ladle internal pressure greater than or equal to the second set pressure P2, including: If the first set pressure P1 is less than the second set pressure P2, then judge whether the first set pressure P1 is less than or equal to the third set pressure P3, if less, then by pressure regulating module directly to the pouring ladle internal injection of gas, adjust the pouring ladle internal pressure greater than or equal to the second set pressure P2; Otherwise, vacuum device continues to pour ladle internal vacuum until reaching the third set pressure P3, then by pressure regulating module to the pouring ladle internal injection of gas, adjust the pouring ladle internal pressure greater than or equal to the second set pressure P2.

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