A pressure die casting machine quantitative soup device with stable flow and easy maintenance

Abstract

This invention discloses a quantitative molten metal feeding device for a die-casting machine that offers stable flow and easy maintenance. The device includes a slurry tank, a valve core module, a cylinder, a connecting shaft, a plunger rod, and a probe module. The valve core module comprises a guide tube, a small end cap, and a large end cap. The guide tube is assembled inside the large end cap. The small end cap and guide tube together can move vertically within the central through-hole of the large end cap. Through-holes A and B are respectively provided on the sides of the guide tube and the large end cap. When the valve core module extends from the bottom of the large end cap, the molten metal sequentially enters the slurry tank through the valve port at the bottom of the guide tube, through-hole A, and through-hole B. When the valve core module retracts from the bottom of the large end cap, the molten metal is sealed and stored inside the slurry tank. This invention achieves stable quantitative molten metal feeding and allows for faster recovery after power outages. The molten metal valve port has an anti-collision structure, ensuring that even if the device experiences a violent collision with the die-casting machine or the ground during operation, the high-temperature molten metal inside will not leak, making it safer to use.

Description

Technical Field

[0001] This invention relates to the field of pressure casting equipment technology, and in particular to a quantitative feed device for a pressure casting machine that provides stable flow and is easy to maintain. Background Technology

[0002] Die casting machines are casting machines that use pressure to inject a certain volume of metal alloy into a metal mold to cool and solidify, obtaining solid metal castings. The molten alloy feeding device is an important peripheral device in die casting equipment. A traditional molten alloy feeding device consists of a ladle, a linkage mechanism, and a chain drive mechanism. Its working process involves the linkage mechanism moving the ladle to a designated position, followed by the chain drive mechanism rotating the ladle to scoop up the molten alloy from the surface, then turning the ladle upright to exit the molten pool. Subsequently, the ladle is moved further to above the die casting machine's feed inlet, and its side rotation is controlled to pour the molten alloy into the die casting machine. This method is similar to scooping and pouring soup with a ladle in daily life, a "top-loading" and "top-pouring" method. During the top-loading process, the ladle's side rotation and upright rotation agitate the surface of the molten alloy, accelerating oxidation. Simultaneously, oxide slag on the surface of the molten alloy is scooped into the ladle along with the molten alloy. Furthermore, this method makes it difficult to precisely control the amount of molten alloy to be formed in the ladle. As the ladle moves to the die-casting machine, the open surface of the molten alloy in the ladle will further oxidize. Finally, the molten alloy carrying the oxide slag enters the die-casting machine to form a die-cast part, and the quality of the die-cast part cannot be guaranteed.

[0003] In recent years, "bottom-feeding" and "bottom-outfeeding" methods for dispensing molten metal have been developed. For example, Chinese patent CN 102935499A discloses a molten metal cup for a die-casting machine, with a feed port at the bottom controlled by a piston rod to achieve bottom-feeding and bottom-outfeeding, eliminating oxide slag in the molten alloy and improving the quality of the die-cast parts. A method using an external probe to control the depth of the cup's immersion in the melt and an internal probe to control the height of the melt inside the cup achieves precise control of the dispensing volume. Chinese patent CN 104907529A similarly discloses a quantitative dispensing system, where a drive mechanism moves a plunger rod up and down inside the outer cylinder, thereby opening and closing the discharge port. Building upon these technologies, Chinese patent CN104353811A discloses a vacuum quantitative container. By controlling the vacuum level of the vacuum chamber and the working state of the cylinder, it achieves automatic extraction and pouring of the raw liquid, ensuring sealed transmission, high cleanliness, and effective prevention of oxidation. Chinese patent CN 103394666 A discloses a soup-feeding device, which, based on the control of the opening and closing of the discharge valve by the aforementioned driving device, has an electric heating tube installed inside the valve body and valve core; when the molten metal inside the device accidentally solidifies, the electric heating tube can melt it.

[0004] The shortcomings of existing technology are:

[0005] 1) The gap at the outlet of the molten metal is uneven in its circumferential direction, which causes the outlet flow of the molten metal feeding device to be unstable; during the process of the molten metal entering the barrel, it is easy to cause molten metal to splash, which not only affects production safety and the environment, but also affects the quality of the molten metal.

[0006] 2) In actual production, the molten metal feeding device often collides with the die-casting machine and its surrounding equipment, or falls to the ground accidentally, causing high-temperature molten metal to leak out, endangering the safety of operators and potentially damaging facilities, posing a potential safety risk.

[0007] 3) Difficult to maintain; In the event of a prolonged power outage, if the soup-feeding device contains molten metal, the molten metal will cool and solidify. In existing technologies, the valve core (or stopper) responsible for opening or closing the valve port has a large contact area with the molten metal, as shown in Chinese patents CN 102935499 A, CN 104907529 A, and CN 104353811 A. Once the molten metal inside the soup-feeding device solidifies, the valve core position is locked, and the valve port cannot be opened normally. Furthermore, due to the excellent heat preservation effect of the slurry tank, even if it is placed in a heat preservation furnace, the solid metal inside will take a long time to remelt. Therefore, the soup-feeding device will take a long time to restore normal function. For example, CN 103394666 A sets up heating tubes in the valve body and valve core, which can solve the problem of solidification and blockage of the internal molten metal, but it also requires the soup-feeding device to have a complex electrical structure for heating. Summary of the Invention

[0008] This invention provides a quantitative broth feeding device for die casting machines with stable flow rate and easy maintenance, which solves the technical defects of existing broth feeding devices such as unstable outlet flow rate, potential safety risks, and difficulty in maintenance.

[0009] The technical solution adopted in this invention includes the following technical features:

[0010] 1) The broth is supplied by "bottom-in broth" and "bottom-out broth" methods; when the device is not supplied with external power or compressed air, the cylinder is in the contracted state, the valve port flow channel is closed, and the molten metal is stably stored in the slurry tank; when the cylinder is in the extended state, the valve port flow channel is open, and the molten metal can flow into or out of the slurry tank from the valve port.

[0011] 2) The device has a structure that enhances the stability of molten metal flow; the molten metal stored in the slurry tank flows to the valve port through the large end cap and the through holes evenly distributed in the circumferential direction on the side of the conduit, and in the above process, the relative position of the valve core module and the slurry tank remains fixed, so that the molten metal at the valve port flows at a steady speed.

[0012] 3) The valve port controlling the inflow and outflow of molten metal has an anti-collision structure; during the operation of the molten metal feeding device, even if the valve port collides violently with the die-casting machine or the ground, the high-temperature molten metal stored inside the molten metal feeding device will not leak.

[0013] 4) The device has a rapid recovery structure after solidification; when the production line experiences a long-term unexpected power outage, the high-temperature molten metal stored inside the soup-feeding device completely cools and solidifies. Because the contact area between the valve core module and the metal is very small, the valve core module will not be locked and can still move vertically inside the large end cap; at this time, the valve core module can be easily removed from the outside of the device; when the production line is restored to power, the soup-feeding device only needs to be immersed again below the surface of the molten metal in the heat preservation furnace, and the metal solidified inside the soup-feeding device will melt quickly; after removing the soup-feeding device and reinstalling the valve core module, the device can restore its normal soup-feeding function.

[0014] The technical solution adopted in this invention specifically includes: a slurry tank, a valve core module, a cylinder, a connecting shaft, a plunger rod, and a probe module;

[0015] The valve core module includes a conduit, a small end cap, and a large end cap; the conduit and the large end cap are hollow parts, and the bottom end face of the large end cap extends into a flange face; the conduit is assembled inside the large end cap, and the center lines of the two coincide; the small end cap is fixedly connected to the upper end of the conduit, and the whole formed by the two can move vertically in the central through hole of the large end cap; through holes A are distributed on the circumference of the conduit, and through holes B are distributed on the side of the large end cap;

[0016] Preferably, the height of the large end cap 23 is greater than the height of the conduit 21.

[0017] The cylinder, connecting shaft, and plunger rod are connected in sequence, and the lower end of the plunger rod is fixedly connected to the valve core module responsible for controlling the inflow and outflow of molten metal. The above structure enables the cylinder to drive the valve core module to move vertically upward or downward. When the cylinder drives the valve core module to its lower stop position, the valve core module extends from the bottom surface of the large end cap, and the molten metal enters the slurry tank through the valve port, through hole A, and through hole B in sequence. When the cylinder drives the valve core module to its upper stop position, the valve core module retracts from the bottom surface of the large end cap, and the molten metal is sealed and stored inside the slurry tank.

[0018] Preferably, the number of through holes A is greater than or equal to one; if there are multiple through holes, the through holes A are evenly distributed on the circumferential surface of the side wall of the conduit; the number of through holes B is greater than or equal to one; if there are multiple through holes B, the through holes B are evenly distributed on the circumferential surface of the side wall of the large end cap.

[0019] Preferably, the small end cap and the plunger rod are connected by countersunk bolts, the exposed part of the bolt head is covered with heat-insulating and fireproof material, and a locating pin is installed between the small end cap and the plunger rod to prevent relative rotation between the two.

[0020] Preferably, the heat-insulating and fire-resistant material is a ceramic fiber board;

[0021] Preferably, the through hole B is a horizontally placed waist-shaped hole or an elliptical hole, and the axis of the through hole A (25) has an angle α with the horizontal line; the angle α is 30-75°;

[0022] If through hole B is an oblong hole, then the length of the hole is 2-5 times its width.

[0023] The slurry tank includes an upper sleeve and a lower sleeve, both of which are hollow cylindrical structures. The upper sleeve and the lower sleeve are connected by welding or flanges. A connecting plate is fixedly connected to the outer side of the upper sleeve. A probe module is vertically installed on one side of the connecting plate. The other side of the connecting plate is fixedly connected to a transport device, and the spatial position of the soup dispensing device is controlled by the transport device. The large end cover is preferably connected to the lower end face of the lower sleeve by a flange.

[0024] Preferably, the probe module is a thermocouple sensor or an electrode-type liquid level sensor.

[0025] If the probe module is a thermocouple sensor, the probe module includes probe A and probe B; probe A is located above probe B, and the bottom surface of probe B is flush with the bottom surface of the large end cap.

[0026] If the probe module is an electrode-type liquid level sensor, the probe module includes probe one, probe two and probe three; probe three is located above probe one and probe two, and the bottom surfaces of probe one and probe two are flush with the bottom surface of the large end cap.

[0027] The upper end of the probe is connected to an AC power source;

[0028] The upper end of the second probe is connected to relay A, normally closed switch, resistor A and ground.

[0029] The upper end of the probe three is connected to relay B, resistor B and ground;

[0030] The relay B is electrically connected to the normally closed switch; when the relay B is energized, the normally closed switch opens.

[0031] Compared with the prior art, the beneficial effects of the present invention include:

[0032] 1) It enables material extraction from below the molten metal surface, avoiding the collection of slag floating on the surface of the molten metal, thus improving the purity of the extracted material and thereby improving the processing quality of the die-cast parts; during the extraction process, the molten metal is isolated from the outside air to prevent oxidation of the molten metal.

[0033] 2) Regardless of how the molten metal level in the furnace changes, the volume of soup taken each time is the same;

[0034] 3) The molten metal flows out of the broth-feeding device more smoothly, greatly reducing splashing of the molten metal;

[0035] 4) When the molten metal feeding device collides with the die-casting machine or the ground, the valve will automatically lock to prevent leakage of molten metal and avoid injury to people and property.

[0036] 5) The factory can quickly resume production in the event of a prolonged unexpected power outage. Attached Figure Description

[0037] Figure 1 A schematic diagram of a conventional method for quantitative soup dispensing;

[0038] Figure 2 This is a cross-sectional view of the overall assembly of the device of the present invention;

[0039] Figure 3 This is a partial sectional view of the device of the present invention.

[0040] Figure 4 A schematic diagram showing the extended state of the valve core module;

[0041] Figure 5 This is a schematic diagram of the valve core module in the retracted state.

[0042] Figure 6 This is a side view of the device of the present invention;

[0043] Figure 7 This is a flowchart illustrating the operation of the device of the present invention;

[0044] Figure 8 This is a schematic diagram illustrating the working principle of an electrode-type liquid level sensor probe.

[0045] Figure 9 This is a schematic diagram of a catheter with an oblique hole.

[0046] Figure 10 Diagram showing the dimensions of the waist-shaped hole;

[0047] Figure 11 This is a schematic diagram of the structure after the valve core module has been removed;

[0048] 1. Slurry tank; 2. Valve core module; 3. Cylinder; 6. Connecting shaft; 7. Plunger rod;

[0049] 8. Probe A; 9. Probe B; 11. Upper sleeve; 12. Lower sleeve; 13. Connecting plate;

[0050] 14. Vent block; 15. Argon inlet tube; 21. Guide tube; 22. Small end cap; 23. Large end cap;

[0051] 25. Through hole A; 26. Through hole B; 27. Valve port; 28. Positioning pin; 30. Insulation furnace;

[0052] 40. Molten metal; 50. Relay A; 51. Relay B; 52. Resistor A; 53. Resistor B;

[0053] 54. Normally closed switch; 61. Probe 1; 62. Probe 2; 63. Probe 3. Detailed Implementation

[0054] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0055] The terms "first," "second," "third," "fourth," etc. (if present) in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that embodiments of the invention described herein can be implemented in sequences other than those illustrated or described herein.

[0056] It should be understood that in the various embodiments of the present invention, the sequence number of each process does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present invention.

[0057] It should be understood that in this invention, "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion, for example, a process, method, system, product, or device that includes a series of steps or units is not necessarily limited to those steps or units that are explicitly listed, but may include other steps or units that are not explicitly listed or that are inherent to such process, method, product, or device.

[0058] It should be understood that in this invention, "multiple" refers to two or more. "And / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship. "Contains A, B, and C", "Contains A, B, and C" means that all three A, B, and C are contained; "Contains A, B, or C" means that one of A, B, and C is contained; "Contains A, B, and / or C" means that any one, two, or three of A, B, and C are contained.

[0059] It should be understood that in this invention, "B corresponding to A", "B corresponding to A", "A and B correspond", or "B and A correspond" means that B is associated with A, and B can be determined based on A. Determining B based on A does not mean determining B solely based on A; B can also be determined based on A and / or other information. Matching A and B is defined as a similarity between A and B that is greater than or equal to a preset threshold.

[0060] Depending on the context, "if" as used here can be interpreted as "when," "when," "in response to determination," or "in response to detection."

[0061] To facilitate understanding of the significant differences and technical effects between this application and conventional techniques, conventional techniques prior to this application are first introduced, such as... Figure 1 As shown.

[0062] A conventional quantitative soup dispensing device includes a cylinder 3, a connecting shaft 6, a plunger rod 7, an upper sleeve 11, a lower sleeve 12, and a valve port 27. The cylinder 3 is located at the top of the device. The cylinder 3, connecting shaft 6, and plunger rod 7 are connected in sequence. The plunger rod 7 is located inside the cavity formed by the upper sleeve 11 and the lower sleeve 12. When the cylinder 3 drives the connecting shaft 6 and the plunger rod 7 to move vertically upward, the valve port 27 gradually opens, and the cavity formed by the upper sleeve 11 and the lower sleeve 12 remains connected to the outside. When the cylinder 3 drives the connecting shaft 6 and the plunger rod 7 to move vertically downward, the valve port 27 gradually closes, and the internal cavity formed by the upper sleeve 11 and the lower sleeve 12 is disconnected from the outside.

[0063] The shortcomings of the conventional technical means are:

[0064] 1) When valve port 27 is open, valve port 27 and plunger rod 7 are separated. Plunger rod 7 loses radial support from valve port 27. Due to deformation under force, the elongated rod assembly formed by connecting shaft 6 and plunger rod 7 will wobble inside the cavity formed by upper sleeve 11 and lower sleeve 12. During the molten metal feeding operation, the molten metal inside the device flows out through valve port 27. At this time, the wobble of the elongated rod assembly will cause the gap between plunger rod 7 and valve port 27 to be uneven in the circumferential direction, which will lead to the instability of the outlet flow of the molten metal feeding device. During the process of molten metal entering the die casting machine barrel, the above-mentioned unstable flow will easily cause molten metal splashing, which will not only affect production safety and the environment, but also affect the quality of molten metal and the quality of molded parts.

[0065] 2) In actual production, the molten metal feeding device often collides with the die-casting machine and its surrounding equipment, or accidentally falls to the ground and collides with the ground. When the valve port 27 is in the open state, if the device collides with the above-mentioned device, the valve port 27 will not automatically close due to the impact, causing the high-temperature molten metal to leak out, endangering the safety of the operator and potentially damaging the facilities, posing a potential safety risk.

[0066] 3) Difficult to maintain; if there is molten metal stored inside the soup-feeding device during a long-term power outage, the molten metal will cool and solidify; since the contact area between the plunger rod 7 and the molten metal is large, once the molten metal inside the soup-feeding device solidifies, the position of the plunger rod 7 will be locked, and the valve port cannot be opened normally; and since the slurry tank has a good heat preservation effect, even if it is placed in a heat preservation furnace, the solid metal inside will take a long time to remelt, so it will take a long time for the soup-feeding device to restore normal function.

[0067] The technical solution of the present invention will be described in detail below with reference to specific embodiments. These specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments.

[0068] Example 1.

[0069] like Figure 2 and Figure 6 As shown, the present invention proposes a quantitative slurry feeding device for a die-casting machine with stable flow and easy maintenance, comprising: a slurry tank 1, a valve core module 2, a cylinder 3, a connecting shaft 6, a plunger rod 7, a probe A8, and a probe B9.

[0070] The cylinder 3 is connected to one end of the connecting shaft 6, and the other end of the connecting shaft 6 is connected to one end of the plunger rod 7. The other end of the plunger rod 7 is connected to the valve core module 2. The above structure enables the cylinder 3 to drive the valve core module 2 to move vertically up or down, thereby controlling the internal cavity of the slurry tank 1 to communicate with or close the external environment.

[0071] The cylinder 3 is a one-way piston cylinder; one end of the cylinder has a piston rod, and the cylinder contains a piston and a spring. Gas is supplied to one side of the piston to generate air pressure, which pushes the piston to generate thrust and extend the piston rod. When the pressure is released, the spring force returns the piston rod to its initial position. When there is no external supply of compressed gas, the spring inside the cylinder 3 extends, and the cylinder 3 is in a contracted state, driving the valve core module 2 to its lower dead center position. When there is an external supply of compressed gas, the spring inside the cylinder 3 is compressed by the piston, and the cylinder 3 is in an extended state, driving the valve core module 2 to its upper dead center position.

[0072] The lower stop position is the lowest position that the valve core module 2 can move to. When the valve core module 2 moves to this position, the through hole A25 and the through hole B26 are at the same height.

[0073] The upper stop position is the highest position that the valve core module 2 can move to. When the valve core module 2 moves to this position, it is at the same height as the bottom surface of the large end cover 23.

[0074] The slurry tank 1 includes an upper sleeve 11 and a lower sleeve 12, both of which are hollow cylindrical structures. To avoid connection failure due to high temperature, the upper sleeve 11 and the lower sleeve 12 are preferably connected by a flange, thus forming a cavity inside both. A connecting plate 13 is fixedly connected to the outer side of the upper sleeve 11. Probes A8 and B9 are vertically installed on one side of the connecting plate 13. Probe A8 is located above probe B9, and the bottom surface of probe B9 is flush with the bottom surface of the large end cap 23. The height of the probes can be adjusted by changing the installation position of the probes on the connecting plate 13. When the ends of probes A8 and B9 are aligned with the metal... When the probe contacts the surface of the liquid 40, it generates a feedback signal to the die-casting machine. The other side of the connecting plate 13 is fixedly connected to the transport device, which controls the spatial position of the device and enables it to move flexibly between the holding furnace 30 and the die-casting machine. A ventilation block 14 is installed through the upper part of the upper sleeve 11. It is a hollow structure with two air passages inside. An argon inlet pipe 15 is installed on the horizontal air passage of the ventilation block 14. The argon gas passes through the vertical air passage of the ventilation block 14, the upper sleeve 11 and the lower sleeve 12 in sequence to reach the top of the liquid metal inside the molten metal device, preventing the liquid metal from oxidizing.

[0075] like Figure 3 As shown, the valve core module 2 includes a conduit 21, a small end cap 22, and a large end cap 23; the conduit 21 and the large end cap 23 are hollow parts, and the bottom end face of the large end cap 23 extends into a flange face; the large end cap 23 is connected to the flange on the lower end face of the lower sleeve 12.

[0076] The conduit 21 is assembled inside the large end cap 3, with their center lines coinciding; the small end cap 22 is fixedly connected to the upper end of the conduit 21, and the whole formed by the two can move vertically within the central through hole of the large end cap 23; through holes A25 are distributed on the circumferential surface of the conduit 21, and through holes B26 are distributed on the side of the large end cap 23.

[0077] Preferably, the number of through holes A25 and through holes B26 is the same; through holes A25 are evenly distributed on the circumferential surface of the side wall of the conduit 21, and through holes B26 are evenly distributed on the circumferential surface of the side wall of the large end cap 23; if the number of through holes A25 and through holes B26 is 4, then through holes A25 are evenly distributed on the side wall of the conduit 21 at 90° intervals.

[0078] The small end cap 22 is connected to the plunger rod 7 by an M20 countersunk bolt. The exposed part of the bolt head is covered with heat-insulating, pressure-resistant and fireproof material to extend the bolt's life and allow the bolt to be repeatedly disassembled. Preferably, the heat-insulating, pressure-resistant and fireproof material is a ceramic fiber board with a thickness of 2-5 mm. A locating pin 28 is installed between the small end cap 22 and the plunger rod 7 to prevent relative rotation between the two.

[0079] The probes A8 and B9 are thermocouple sensors. The upstream die-casting machine control system receives the analog signals emitted by the probes and converts them into digital signals. By comparing the temperature detected by the probes with the average temperature inside the holding furnace 30, it determines whether the probes A8 and B9 have come into contact with the molten metal 40. Specifically, when the temperature detected by the probes A8 or B9 reaches 80% of the average temperature inside the holding furnace 30, the upstream die-casting machine control system considers that the probe has come into contact with the molten metal 40.

[0080] The upstream die-casting machine control system is a programmable logic controller or an industrial control computer.

[0081] The working process of the device of the present invention will be further explained below in conjunction with different usage environments.

[0082] like Figure 7 As shown, under normal operating conditions, using the quantitative feeder for a die-casting machine with stable flow rate and easy maintenance according to the present invention includes the following steps:

[0083] 1) Based on the volume of molten metal required for the die casting operation, calculate the depth S required for the molten metal feeding device to sink below the molten metal surface; adjust the height difference between the lower end faces of probe A8 and probe B9 to make it equal to S; the bottom surface of probe B9 is flush with the bottom surface of the large end cap 23.

[0084] 2) Retrieving broth from the holding furnace: The broth-feeding device is transported from the top into the holding furnace 30 via a conveyor. Probe B9 first contacts the molten metal surface. The upstream die-casting machine receives the analog signal from probe B9 and determines that the bottom surface of the large end cap 23 is now flush with the molten metal surface, and the broth-feeding operation can begin. The upstream die-casting machine sends a command to the solenoid valve controlling the movement of cylinder 3, supplying compressed gas to the piston side of cylinder 3, keeping the piston rod of cylinder 3 extended, and ultimately driving the valve core module 2 to extend from the bottom surface of the large end cap 23. When the valve core module 2 moves to its lower stop position, the molten metal enters the slurry tank 1 through valve port 27, through hole A25, and through hole B26 in sequence. To prevent air from entering the device prematurely and causing oxidation of the molten metal, valve port 27 remains closed until probe B9 contacts the molten metal surface.

[0085] 3) Termination of molten metal extraction; As the conveying device continues to penetrate the molten metal 40, probe A8 contacts the surface of the molten metal; the upstream die-casting machine receives the analog signal from probe A8; when probe A8 detects that the temperature reaches 80% of the average temperature inside the holding furnace 30, the upstream die-casting machine determines that the conveying device has sunk to a height S, and sufficient molten metal has flowed into the slurry tank 1, thus terminating the extraction of molten metal; at this time, the upstream die-casting machine sends a command to the solenoid valve controlling the movement of cylinder 3 to stop supplying compressed gas to the piston side of cylinder 3, causing the piston rod of cylinder 3 to be in a contracted state, and ultimately driving the valve core module 2 to retract from the bottom surface of the large end cover 23 and move to the upper dead center position, sealing and storing the molten metal inside the slurry tank 1; simultaneously, the conveying device stops penetrating the molten metal 40; the total stroke of cylinder 3 is the distance between the upper dead center position and the lower dead center position of valve core module 2;

[0086] 4) The transport device transports the slurry feeding device to the top of the die casting machine cylinder. The upstream die casting machine sends a command to the solenoid valve that controls the movement of cylinder 3, so that cylinder 3 is kept in the extended state, and finally drives valve core module 2 to extend from the bottom surface of large end cover 23. The molten metal flows out from slurry tank 1 and enters the die casting machine cylinder.

[0087] 5) After the die-casting machine cylinder is filled, the die-casting machine retracts the control valve core module 2 from the bottom of the large end cover 23 and closes the slurry tank 1 again.

[0088] In the event of an accidental impact between the soup dispensing device and the ground or the heat preservation furnace, the protective measures of the present invention include:

[0089] Scenario 1: During the process of the conveying device transporting the molten metal feeding device to the top of the die-casting machine cylinder, the valve core module 2 is in a retracted state from the bottom surface of the large end cover 23, such as... Figure 5 As shown; during the above process, the impact force on the soup dispensing device does not directly act on the valve core module 2; and at this time, the relative position of the valve core module 2 and the large end cover 23 is fixed, and the inertial force generated by the impact will not change the relative position of the valve core module 2 and the large end cover 23, ensuring that the valve port 27 always remains closed.

[0090] Scenario 2: During the process of molten metal flowing from slurry tank 1 into the die-casting machine cylinder, valve core module 2 is in a state of extending from the bottom surface of large end cover 23, such as... Figure 4 As shown; at this time, if the valve core module 2 collides with the upper edge of the heat preservation furnace or the ground, the valve core module 2 will be pushed into the large end cover 23 due to the impact force; the reason for the above action is that the impact force is transmitted to the cylinder, causing a brief abnormal increase in the air pressure value in the cylinder control air circuit; the air pressure sensor in the air circuit detects the abnormal increase in air pressure value and sends an alarm to the die casting machine that the molten metal feeding device has collided, and then the upstream die casting machine sends a command to the solenoid valve that controls the movement of the cylinder 3 to control the valve core module 2 to remain in the retracted state to prevent further leakage of molten metal.

[0091] When the production line experiences a prolonged power outage, if the soup-feeding device is outside the holding furnace and contains molten metal, the molten metal will cool and solidify. Since molten metal cannot remain inside the conduit 21, and the valve core module 2 only partially contacts the molten metal, even if all the metal in the slurry tank 1 solidifies, the valve core module 2 can still move independently within the large end cap. The valve core module 2 can be removed from the device by removing the heat-insulating, pressure-resistant, and fire-retardant material and the M20 countersunk bolts; this process does not require the removal of other parts. Once power is restored to the production line, the soup-feeding device can be immersed below the molten metal surface in the holding furnace 30. The solid metal inside the soup-feeding device comes into direct contact with the liquid metal and is rapidly melted, allowing the solid metal inside the soup-feeding device to be quickly removed.

[0092] Example 2.

[0093] Compared with Embodiment 1, the advantages of Embodiment 2 are: the probe can more accurately and quickly determine the state of soup taking and giving, and the molten metal is less likely to remain inside the valve core module 2, making the valve core module 2 move more flexibly inside the large end cap 23.

[0094] The first difference in Example 2 is the number, distribution, and control method of the probes.

[0095] like Figure 8 As shown, probe 1 61, probe 2 62 and probe 3 63 are installed on one side of the connecting plate 13 of the soup dispensing device in Embodiment 2; the probes are electrode-type liquid level sensors; probe 3 63 is located above probe 1 61 and probe 2 62, and the bottom surfaces of probe 1 61 and probe 2 62 are at the same horizontal height as the bottom surface of the large end cap 23.

[0096] The upper end of probe 1 (61) is connected to a 24V power supply; the upper end of probe 2 (62) is connected to relay A50, resistor A52, and ground; the upper end of probe 3 (63) is connected to relay B51, resistor B53, and ground.

[0097] The 24V power supply is provided by the output terminal of the die-casting machine control system.

[0098] The broth-feeding device is brought into the heat-preserving furnace 30 from the top by a transport device to extract the broth; at the same time, the output terminal of the die-casting machine control system outputs 24V voltage.

[0099] Probe 1 61 and probe 2 62 simultaneously contact the molten metal surface; due to the conductivity of the molten metal, probe 1 61, probe 2 62 and the molten metal form an electrical path, relay A50 is energized, and normally closed switch 54 is in the closed state; relay A50 is electrically connected to the air inlet valve of the compressed gas controlling cylinder 3; when relay A50 is energized, the air inlet valve opens, cylinder 3 remains in the extended state, and finally drives valve core module 2 to extend from the bottom surface of large end cover 23, and molten metal enters the slurry tank 1 through valve port 27, through hole A25 and through hole B26 in sequence;

[0100] As the soup dispensing device continues to penetrate the molten metal 40, probe 3 63 also comes into contact with the surface of the molten metal. Probe 1 61, probe 3 63, and the molten metal form an electrical circuit, and relay B51 is energized. Relay B51 is electrically connected to normally closed switch 54. When relay B51 is energized, normally closed switch 54 switches to the open state, relay A50 is de-energized, the air inlet valve closes, cylinder 3 switches to the retracted state, and finally drives valve core module 2 to retract from the bottom of large end cover 23. The molten metal is sealed and stored inside slurry tank 1, completing the soup dispensing operation.

[0101] Subsequently, the molten metal feeding device is raised in the holding furnace 30 by the transport device. At the same time, the output terminal of the die-casting machine control system stops supplying 24V voltage, so that probe 1 61, probe 3 63 and molten metal cannot form an electrical path. Relays A50 and B51 are both de-energized, the air intake valve is closed, and cylinder 3 remains in the retracted state.

[0102] When the conveying device moves the molten metal feeding device above the die-casting machine cylinder, probe 1 61 and probe 2 62 simultaneously come into contact with the metal cylinder. At this time, the output terminal of the die-casting machine control system outputs 24V voltage, and probe 1 61, probe 2 62 and the metal cylinder form an electrical circuit. Valve core module 2 extends from the bottom surface of the large end cover 23, and the molten metal enters the cylinder, completing the feeding action.

[0103] Subsequently, the transport device controls the disengagement of the slurry feeding device from the metal cylinder. This disconnects the electrical circuit formed by probe 61, probe 62, and the metal cylinder. The valve core module 2 retracts from the bottom of the large end cover 23, and the valve port 27 closes, preventing air and moisture from entering the slurry tank 1. It also prevents the leakage of a small amount of residual molten metal inside the slurry feeding device during the transfer process, thereby contaminating the surrounding area of ​​the production line.

[0104] The second difference in Example 2 is that the structure of catheter 21 is different.

[0105] like Figure 9As shown, the axis of the through holes A25 distributed on the circumferential surface of the side wall of the conduit 21 has an angle α with the horizontal line, which is 30-75°. Each time the valve core module 2 switches states, the molten metal remaining in the gap between the conduit 21 and the large end cap 23 will be discharged through the through holes A25 and the valve port 27. Setting the angle α is beneficial to the spontaneous discharge of the molten metal.

[0106] Preferably, the through hole B26 is a horizontally placed waist-shaped hole or an elliptical hole.

[0107] If through hole B26 is an oblong hole, then the length of the hole is three times its width, such as... Figure 10 As shown; this arrangement of holes eliminates the need to assemble the locating pin 28 between the small end cap 22 and the plunger rod 7; because no matter how the installation angle of the valve core module 2 changes within the large end cap 23, the through holes A25 and B26 can form a stable liquid passage.

[0108] Example 3, as Figure 11 As shown.

[0109] Compared to Embodiment 1, Embodiment 3 has the advantage that when the production line experiences a long-term power outage, the valve core module 2 can move more flexibly and independently within the large end cover.

[0110] The difference in Embodiment 3 is that the height of the large end cap 23 is greater than the height of the conduit 21. When the valve core module 2 retracts from the bottom surface of the large end cap 23, the valve port 27 is closed, and the molten metal inside the conduit 21 automatically flows out. If the production line experiences a prolonged power outage, the molten metal stored inside the device will cool and solidify. However, the structure of Embodiment 3 ensures that the valve core module 2 does not directly contact the solid metal, thus allowing the valve core module 2 to move flexibly and independently within the large end cap. By removing the heat-insulating, pressure-resistant, and fire-retardant material and the M20 countersunk bolts, the valve core module 2 can be removed from the device without disassembling other parts. After power is restored to the production line, the soup-feeding device can be immersed below the molten metal surface in the holding furnace 30. The solid metal solidified inside the soup-feeding device comes into direct contact with the liquid metal and is rapidly melted, allowing the solid metal inside the soup-feeding device to be quickly removed.

[0111] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A quantitative feeder for a die-casting machine with stable flow rate and easy maintenance, characterized in that... include: Slurry tank (1), valve core module (2), cylinder (3), connecting shaft (6), plunger rod (7) and probe module; The valve core module (2) includes a conduit (21), a small end cap (22), and a large end cap (23); the conduit (21) and the large end cap (23) are hollow tubular parts, and the bottom end face of the large end cap (23) extends into a flange face; the conduit (21) is assembled inside the large end cap (23), and the center lines of the two coincide; the small end cap (22) is fixedly connected to the upper end of the conduit (21), and the whole formed by the two can move vertically in the central through hole of the large end cap (23); through holes A (25) are distributed on the circumferential surface of the conduit (21), and through holes B (26) are distributed on the side of the large end cap (23). The cylinder (3) is fixedly connected to one end of the connecting shaft (6), and the other end of the connecting shaft (6) is fixedly connected to one end of the plunger rod (7), and the other end of the plunger rod (7) is fixedly connected to the valve core module (2); the valve core module (2) moves vertically upward or downward under the drive of the cylinder (3); when the valve core module (2) moves to its lower stop position, the valve core module (2) extends out from the bottom surface of the large end cover (23), and the molten metal enters the slurry tank (1) through the valve port (27), through hole A (25) and through hole B (26) in sequence; when the valve core module (2) moves to its upper stop position, the valve core module (2) retracts from the bottom surface of the large end cover (23), and the through hole A (25) and through hole B (26) are not connected, and the molten metal is sealed and stored inside the slurry tank (1); The slurry tank (1) includes an upper sleeve (11) and a lower sleeve (12), which are fixedly connected; a connecting plate (13) is fixedly connected to the outer side of the upper sleeve (11); a probe module is vertically installed on one side of the connecting plate (13); the other side of the connecting plate (13) is fixedly connected to the transport device; The bottom end face of the large end cap (23) is connected to the lower end face of the lower sleeve (12) by a flange.

2. The quantitative feeder for a die-casting machine with stable flow rate and easy maintenance according to claim 1, characterized in that: The number of through holes A (25) is greater than or equal to one; if there are multiple through holes, the through holes A (25) are evenly distributed on the circumferential surface of the side wall of the guide tube (21); the number of through holes B (26) is greater than or equal to one; if there are multiple through holes, the through holes B (26) are evenly distributed on the circumferential surface of the side wall of the large end cap (23); The small end cap (22) is connected to the plunger rod (7) by countersunk bolts. The exposed part of the bolt head is covered with heat-insulating and fireproof material. A positioning pin (28) is installed between the small end cap (22) and the plunger rod (7) to prevent relative rotation between the two.

3. The flow rate stable and easy-to-maintain quantitative feeder for a die-casting machine according to claim 1, characterized in that: Through hole B (26) is a horizontally placed waist-shaped hole or an elliptical hole. The axis of through hole A (25) has an angle α with the horizontal line; the angle α is 30-75°; the small end cap (22) and the plunger rod (7) are connected only by countersunk bolts, and the exposed part of the bolt head is covered with heat-insulating and fireproof material; the heat-insulating and fireproof material is ceramic fiber board; if through hole B (26) is a waist-shaped hole, the length of the hole is 2-5 times the width.

4. The flow rate stable and easy-to-maintain quantitative feeder for a die-casting machine according to claim 1, characterized in that: A ventilation block (14) is installed through the upper part of the upper sleeve (11), which is a hollow structure with two air passages inside; an argon inlet pipe (15) is installed on the horizontal air passage of the ventilation block (14); the argon gas passes through the vertical air passage of the ventilation block (14), the upper sleeve (11) and the lower sleeve (12) in sequence to reach the top of the molten metal inside the soup feeding device, so as to prevent the molten metal from oxidizing.

5. The flow rate stable and easy-to-maintain quantitative feeder for a die-casting machine according to claim 1, characterized in that: The probe module is either a thermocouple sensor or an electrode-type liquid level sensor.

6. The flow rate stable and easy-to-maintain quantitative feeder for a die-casting machine according to claim 5, characterized in that: If the probe module is a thermocouple sensor, the probe module includes probe A (8) and probe B (9); probe A (8) is located above probe B (9), and the bottom surface of probe B (9) is flush with the bottom surface of the large end cap (23).

7. The flow rate stable and easy-to-maintain quantitative feeder for a die-casting machine according to claim 5, characterized in that: If the probe module is an electrode-type liquid level sensor, the probe module includes probe one (61), probe two (62) and probe three (63); probe three (63) is located above probe one (61) and probe two (62), and the bottom surfaces of probe one (61) and probe two (62) are flush with the bottom surface of the large end cap (23). The upper end of the probe (61) is connected to an AC power source; The upper end of the probe two (62) is connected to relay A (50), normally closed switch (54), resistor A (52) and ground; The upper end of the probe three (63) is connected to relay B (51), resistor B (53) and ground; The relay B (51) is electrically connected to the normally closed switch (54); when the relay B (51) is powered on, the normally closed switch (54) switches to the open state.

8. The flow rate stable and easy-to-maintain quantitative feeder for a die-casting machine according to claim 1, characterized in that: The height of the large end cap (23) is greater than the height of the conduit (21).

9. A method for rapid restoration of a soup-feeding device after a power outage using the apparatus of claim 1, characterized in that: When the production line experiences a long-term unexpected power outage, the molten metal inside the soup-feeding device cools and solidifies. After the power supply to the production line is restored, the valve core module (2) is removed from the plunger rod (7), and the soup-feeding device is then immersed in the molten metal in the heat preservation furnace (30), where the solid metal inside the soup-feeding device melts rapidly.

10. A method for preventing leakage from impact in a soup dispensing device using the apparatus described in claim 1, characterized in that: When the valve core module (2) is impacted, it is pushed into the large end cap (23) due to the impact force. The impact will cause the air pressure in the control air circuit of the cylinder to rise abnormally. The air pressure sensor in the air circuit will detect the abnormal air pressure and send an alarm to the die casting machine that the molten metal device has collided. Then the upstream die casting machine sends a command to the solenoid valve that controls the movement of the cylinder (3) to keep the cylinder (3) in the retracted state, thereby keeping the valve core module (2) in the retracted state and preventing further leakage of molten metal.

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